{ "id": "/cairo/festivals/1981", "place": { "id": "360630", "slug": "cairo", "name": "Cairo", "region": "Egypt", "country": "EG", "lat": 30.06263, "lon": 31.24967, "elevation_m": 23, "tz": "Africa/Cairo" }, "year": 1981, "tradition": "smarta", "method": "pac-rp@2026.1", "ruleset": "2026.3-draft", "rulings": [ { "id": "/cairo/festivals/1981/ekadashi?on=1981-01-01", "festival": "ekadashi", "name": "Saphalā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6363, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-01-01T02:50:38+02:00", "utc": "1981-01-01T00:50:38Z", "ms": 347158238316.0212 }, "end": { "local": "1981-01-02T05:05:34+02:00", "utc": "1981-01-02T03:05:34Z", "ms": 347252734100.33154 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-01-01T02:50:38+02:00", "utc": "1981-01-01T00:50:38Z", "ms": 347158238316.0212 }, "end": { "local": "1981-01-02T05:05:34+02:00", "utc": "1981-01-02T03:05:34Z", "ms": 347252734100.33154 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-01-01", "window": { "start": { "local": "1981-01-01T06:51:23+02:00", "utc": "1981-01-01T04:51:23Z", "ms": 347172682800.107 }, "end": { "local": "1981-01-01T06:51:23+02:00", "utc": "1981-01-01T04:51:23Z", "ms": 347172682800.107 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-01-02", "window": { "start": { "local": "1981-01-02T06:51:37+02:00", "utc": "1981-01-02T04:51:37Z", "ms": 347259096802.9144 }, "end": { "local": "1981-01-02T06:51:37+02:00", "utc": "1981-01-02T04:51:37Z", "ms": 347259096802.9144 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 02:51 on Thu 1 Jan to 05:06 on Fri 2 Jan.", "fact": "1981-01-01T00:50:38Z → 1981-01-02T03:05:34Z" }, { "step": "kaala", "text": "Sunrise is at 06:51 on the 1st and 06:52 on the 2nd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 1st and is not on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 6363 s" }, { "step": "ruling", "text": "Saphalā Ekādaśī, Cairo, 1981: Thursday 1 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-01", "confidence": "determinate" } ], "quote": "In Cairo, Saphalā Ekādaśī 1981 falls on Thursday 1 January. Ekādaśī runs from 02:51 on Thu 1 Jan to 05:06 on Fri 2 Jan and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-01-01", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-01-03", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 31894, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-01-03T06:55:55+02:00", "utc": "1981-01-03T04:55:55Z", "ms": 347345755300.01794 }, "end": { "local": "1981-01-04T08:16:32+02:00", "utc": "1981-01-04T06:16:32Z", "ms": 347436992198.3991 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-01-03T06:55:55+02:00", "utc": "1981-01-03T04:55:55Z", "ms": 347345755300.01794 }, "end": { "local": "1981-01-04T08:16:32+02:00", "utc": "1981-01-04T06:16:32Z", "ms": 347436992198.3991 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-01-03", "window": { "start": { "local": "1981-01-03T17:07:22+02:00", "utc": "1981-01-03T15:07:22Z", "ms": 347382441982.70483 }, "end": { "local": "1981-01-03T18:57:19+02:00", "utc": "1981-01-03T16:57:19Z", "ms": 347389039059.68085 } }, "covered_min": 110, "window_min": 110, "qualifies": true }, { "local_date": "1981-01-04", "window": { "start": { "local": "1981-01-04T17:08:07+02:00", "utc": "1981-01-04T15:08:07Z", "ms": 347468886639.5253 }, "end": { "local": "1981-01-04T18:57:59+02:00", "utc": "1981-01-04T16:57:59Z", "ms": 347475478991.21906 } }, "covered_min": 0, "window_min": 110, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 06:56 on Sat 3 Jan to 08:17 on Sun 4 Jan.", "fact": "1981-01-03T04:55:55Z → 1981-01-04T06:16:32Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:07–18:57 on the 3rd, 17:08–18:58 on the 4th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 110 of 110 minutes on the 3rd and 0 of 110 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 31894 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Saturday 3 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-03", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Saturday 3 January. Trayodaśī runs from 06:56 on Sat 3 Jan to 08:17 on Sun 4 Jan and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-01-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-01-04", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28371, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-01-04T08:16:32+02:00", "utc": "1981-01-04T06:16:32Z", "ms": 347436992198.3991 }, "end": { "local": "1981-01-05T09:05:38+02:00", "utc": "1981-01-05T07:05:38Z", "ms": 347526338183.52924 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-01-04T08:16:32+02:00", "utc": "1981-01-04T06:16:32Z", "ms": 347436992198.3991 }, "end": { "local": "1981-01-05T09:05:38+02:00", "utc": "1981-01-05T07:05:38Z", "ms": 347526338183.52924 } }, "kaala": "nishita", "days": [ { "local_date": "1981-01-03", "window": { "start": { "local": "1981-01-03T23:35:41+02:00", "utc": "1981-01-03T21:35:41Z", "ms": 347405741021.36487 }, "end": { "local": "1981-01-04T00:23:41+02:00", "utc": "1981-01-03T22:23:41Z", "ms": 347408621021.36487 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-01-04", "window": { "start": { "local": "1981-01-04T23:36:08+02:00", "utc": "1981-01-04T21:36:08Z", "ms": 347492167958.3768 }, "end": { "local": "1981-01-05T00:24:08+02:00", "utc": "1981-01-04T22:24:08Z", "ms": 347495047958.3768 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 08:17 on Sun 4 Jan to 09:06 on Mon 5 Jan.", "fact": "1981-01-04T06:16:32Z → 1981-01-05T07:05:38Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:36–00:24 on the 3rd, 23:36–00:24 on the 4th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 3rd and 48 of 48 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 28371 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Sunday 4 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-04", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Sunday 4 January. Caturdaśī runs from 08:17 on Sun 4 Jan to 09:06 on Mon 5 Jan and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-01-04", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-01-09", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 14174, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-01-09T07:42:01+02:00", "utc": "1981-01-09T05:42:01Z", "ms": 347866921073.54486 }, "end": { "local": "1981-01-10T06:26:18+02:00", "utc": "1981-01-10T04:26:18Z", "ms": 347948778286.5653 }, "month": { "amanta": 9, "purnimanta": 9, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-01-09T07:42:01+02:00", "utc": "1981-01-09T05:42:01Z", "ms": 347866921073.54486 }, "end": { "local": "1981-01-10T06:26:18+02:00", "utc": "1981-01-10T04:26:18Z", "ms": 347948778286.5653 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-01-09", "window": { "start": { "local": "1981-01-09T11:38:15+02:00", "utc": "1981-01-09T09:38:15Z", "ms": 347881095309.4194 }, "end": { "local": "1981-01-09T12:26:15+02:00", "utc": "1981-01-09T10:26:15Z", "ms": 347883975309.4194 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-01-10", "window": { "start": { "local": "1981-01-10T11:38:40+02:00", "utc": "1981-01-10T09:38:40Z", "ms": 347967520129.7833 }, "end": { "local": "1981-01-10T12:26:40+02:00", "utc": "1981-01-10T10:26:40Z", "ms": 347970400129.7833 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 07:42 on Fri 9 Jan to 06:26 on Sat 10 Jan.", "fact": "1981-01-09T05:42:01Z → 1981-01-10T04:26:18Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 9th, 11:39–12:27 on the 10th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 9th and 0 of 48 on the 10th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 14174 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Friday 9 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-09", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Friday 9 January. Caturthī runs from 07:42 on Fri 9 Jan to 06:26 on Sat 10 Jan and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-01-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/bhogi", "festival": "bhogi", "name": "Bhogi", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18695, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-02-12T11:28:15+02:00", "utc": "1981-02-12T09:28:15Z", "ms": 350818095129.987 } }, "span": { "of": "transit", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 } }, "kaala": "sunset-day", "days": [ { "local_date": "1981-01-13", "window": { "start": { "local": "1981-01-12T17:14:29+02:00", "utc": "1981-01-12T15:14:29Z", "ms": 348160468568.29333 }, "end": { "local": "1981-01-13T17:15:19+02:00", "utc": "1981-01-13T15:15:19Z", "ms": 348246918681.2348 } }, "covered_min": 0, "window_min": 1441, "qualifies": false }, { "local_date": "1981-01-14", "window": { "start": { "local": "1981-01-13T17:15:19+02:00", "utc": "1981-01-13T15:15:19Z", "ms": 348246918681.2348 }, "end": { "local": "1981-01-14T17:16:09+02:00", "utc": "1981-01-14T15:16:09Z", "ms": 348333369172.2783 } }, "covered_min": 1, "window_min": 1441, "qualifies": true } ], "follows": { "festival": "pongal", "name": "Pongal", "local_date": "1981-01-14", "days": -1 }, "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 22:27 on Tue 13 Jan.", "fact": "1981-01-13T20:26:53Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from the sunset before it to its own sunset: the day of the 13th ends at 17:15, and the day of the 14th ends at 17:16.", "fact": "sunset-day: sunset-to-sunset · sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "The festival is kept on the day of the transit, the day counted from the sunset before it: a transit after sunset belongs to the next day. The transit falls between the sunsets of the 13th and the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106" }, { "step": "tie_break", "text": "An instant falls in one day and no other. No tie-break is needed.", "fact": "day counted from sunset → only-day · margin 18695 s" }, { "step": "counted", "text": "Bhogi is kept the day before Pongal: Wednesday 14 January is the day taken above.", "fact": "follows: pongal − 1 d" }, { "step": "ruling", "text": "Bhogi, Cairo, 1981: Tuesday 13 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "solar", "id": "bhogi", "follows": { "festival": "pongal", "days": -1 }, "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Makaradi — Makaradi snana, Magh Bihu (Assam), Tila samkranti, Pongal (S. India), Bhogi (S. India — on the day before Pongal), Mattu Pongal (S. India — on the day after Pongal)." }, { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Tamil rule: In the Tamil districts the rule is that when a samkranti takes place before sunset, the month begins on the same day, while if it takes place after sunset the month begins on the following day." } ], "rashi": "Makara", "day_from": "sunset" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-13", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "1981-01-12", "statement": "Counted from midnight", "reference": { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day." } }, { "kind": "reckoning", "id": "sunrise-day", "local_date": "1981-01-12", "statement": "Counted from sunrise (the Orissa rule)", "reference": { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Orissa rule: In Orissa the solar months of the Amli and Vilayati eras begin civilly on the same day (sunrise to next sunrise) as the samkranti, irrespective of whether this takes place before or after midnight." } } ], "quote": "In Cairo, Bhogi 1981 falls on Tuesday 13 January. It is kept the day before Pongal, which falls on Wednesday 14 January. The Sun enters Makara at 22:27 on Tue 13 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th. Counted from midnight, or counted from sunrise, as in Orissa, it is 12 January.", "cite": "https://ahargana.org/cairo/festivals/1981/bhogi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/makara-sankranti", "festival": "makara-sankranti", "name": "Makara Saṅkrānti", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5587, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-02-12T11:28:15+02:00", "utc": "1981-02-12T09:28:15Z", "ms": 350818095129.987 } }, "span": { "of": "transit", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 } }, "kaala": "civil-day", "days": [ { "local_date": "1981-01-13", "window": { "start": { "local": "1981-01-13T00:00:00+02:00", "utc": "1981-01-12T22:00:00Z", "ms": 348184800000 }, "end": { "local": "1981-01-14T00:00:00+02:00", "utc": "1981-01-13T22:00:00Z", "ms": 348271200000 } }, "covered_min": 1, "window_min": 1440, "qualifies": true }, { "local_date": "1981-01-14", "window": { "start": { "local": "1981-01-14T00:00:00+02:00", "utc": "1981-01-13T22:00:00Z", "ms": 348271200000 }, "end": { "local": "1981-01-15T00:00:00+02:00", "utc": "1981-01-14T22:00:00Z", "ms": 348357600000 } }, "covered_min": 0, "window_min": 1440, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 22:27 on Tue 13 Jan.", "fact": "1981-01-13T20:26:53Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from midnight to midnight, on the clock of Cairo.", "fact": "civil-day: midnight-to-midnight · Africa/Cairo" }, { "step": "rule", "text": "The festival is kept on the day of the transit, the day counted from midnight. The transit falls on the 13th, not the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106" }, { "step": "tie_break", "text": "An instant falls in one day and no other. No tie-break is needed.", "fact": "day counted from midnight → only-day · margin 5587 s" }, { "step": "ruling", "text": "Makara Saṅkrānti, Cairo, 1981: Tuesday 13 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "solar", "id": "makara-sankranti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Makaradi — Makaradi snana, Magh Bihu (Assam), Tila samkranti, Pongal (S. India), Bhogi (S. India — on the day before Pongal), Mattu Pongal (S. India — on the day after Pongal)." }, { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day." } ], "rashi": "Makara", "day_from": "midnight" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-13", "confidence": "determinate" }, { "kind": "reckoning", "id": "sunrise-day", "local_date": "1981-01-13", "statement": "Counted from sunrise (the Orissa rule)", "reference": { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Orissa rule: In Orissa the solar months of the Amli and Vilayati eras begin civilly on the same day (sunrise to next sunrise) as the samkranti, irrespective of whether this takes place before or after midnight." } }, { "kind": "reckoning", "id": "sunset-rule", "local_date": "1981-01-14", "statement": "Past sunset, the next day (the Tamil rule)", "reference": { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Tamil rule: In the Tamil districts the rule is that when a samkranti takes place before sunset, the month begins on the same day, while if it takes place after sunset the month begins on the following day." } } ], "quote": "In Cairo, Makara Saṅkrānti 1981 falls on Tuesday 13 January. The Sun enters Makara at 22:27 on Tue 13 Jan, and the rule counts the day from midnight. By the Tamil rule for the first day of a solar month, which gives a transit after sunset to the next day, it is 14 January.", "cite": "https://ahargana.org/cairo/festivals/1981/makara-sankranti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pongal", "festival": "pongal", "name": "Pongal", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18695, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-02-12T11:28:15+02:00", "utc": "1981-02-12T09:28:15Z", "ms": 350818095129.987 } }, "span": { "of": "transit", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 } }, "kaala": "sunset-day", "days": [ { "local_date": "1981-01-13", "window": { "start": { "local": "1981-01-12T17:14:29+02:00", "utc": "1981-01-12T15:14:29Z", "ms": 348160468568.29333 }, "end": { "local": "1981-01-13T17:15:19+02:00", "utc": "1981-01-13T15:15:19Z", "ms": 348246918681.2348 } }, "covered_min": 0, "window_min": 1441, "qualifies": false }, { "local_date": "1981-01-14", "window": { "start": { "local": "1981-01-13T17:15:19+02:00", "utc": "1981-01-13T15:15:19Z", "ms": 348246918681.2348 }, "end": { "local": "1981-01-14T17:16:09+02:00", "utc": "1981-01-14T15:16:09Z", "ms": 348333369172.2783 } }, "covered_min": 1, "window_min": 1441, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 22:27 on Tue 13 Jan.", "fact": "1981-01-13T20:26:53Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from the sunset before it to its own sunset: the day of the 13th ends at 17:15, and the day of the 14th ends at 17:16.", "fact": "sunset-day: sunset-to-sunset · sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "The festival is kept on the day of the transit, the day counted from the sunset before it: a transit after sunset belongs to the next day. The transit falls between the sunsets of the 13th and the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106" }, { "step": "tie_break", "text": "An instant falls in one day and no other. No tie-break is needed.", "fact": "day counted from sunset → only-day · margin 18695 s" }, { "step": "ruling", "text": "Pongal, Cairo, 1981: Wednesday 14 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "solar", "id": "pongal", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Makaradi — Makaradi snana, Magh Bihu (Assam), Tila samkranti, Pongal (S. India), Bhogi (S. India — on the day before Pongal), Mattu Pongal (S. India — on the day after Pongal)." }, { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Tamil rule: In the Tamil districts the rule is that when a samkranti takes place before sunset, the month begins on the same day, while if it takes place after sunset the month begins on the following day." } ], "not_evaluated": "The rule that heads the solar festivals, the day \"taken to begin from midnight\" (p. 106), is not applied to Pongal. It is kept on the first day of the month of Makara as the Tamil districts count it, a transit after sunset going to the next day (p. 244); the Rashtriya Panchang prints Pongal so.", "rashi": "Makara", "day_from": "sunset" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-14", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "1981-01-13", "statement": "Counted from midnight", "reference": { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day." } }, { "kind": "reckoning", "id": "sunrise-day", "local_date": "1981-01-13", "statement": "Counted from sunrise (the Orissa rule)", "reference": { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Orissa rule: In Orissa the solar months of the Amli and Vilayati eras begin civilly on the same day (sunrise to next sunrise) as the samkranti, irrespective of whether this takes place before or after midnight." } } ], "quote": "In Cairo, Pongal 1981 falls on Wednesday 14 January. The Sun enters Makara at 22:27 on Tue 13 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th. Counted from midnight, or counted from sunrise, as in Orissa, it is 13 January.", "cite": "https://ahargana.org/cairo/festivals/1981/pongal", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/mattu-pongal", "festival": "mattu-pongal", "name": "Mattu Pongal", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18695, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-02-12T11:28:15+02:00", "utc": "1981-02-12T09:28:15Z", "ms": 350818095129.987 } }, "span": { "of": "transit", "start": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 }, "end": { "local": "1981-01-13T22:26:53+02:00", "utc": "1981-01-13T20:26:53Z", "ms": 348265613318.17065 } }, "kaala": "sunset-day", "days": [ { "local_date": "1981-01-13", "window": { "start": { "local": "1981-01-12T17:14:29+02:00", "utc": "1981-01-12T15:14:29Z", "ms": 348160468568.29333 }, "end": { "local": "1981-01-13T17:15:19+02:00", "utc": "1981-01-13T15:15:19Z", "ms": 348246918681.2348 } }, "covered_min": 0, "window_min": 1441, "qualifies": false }, { "local_date": "1981-01-14", "window": { "start": { "local": "1981-01-13T17:15:19+02:00", "utc": "1981-01-13T15:15:19Z", "ms": 348246918681.2348 }, "end": { "local": "1981-01-14T17:16:09+02:00", "utc": "1981-01-14T15:16:09Z", "ms": 348333369172.2783 } }, "covered_min": 1, "window_min": 1441, "qualifies": true } ], "follows": { "festival": "pongal", "name": "Pongal", "local_date": "1981-01-14", "days": 1 }, "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 22:27 on Tue 13 Jan.", "fact": "1981-01-13T20:26:53Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from the sunset before it to its own sunset: the day of the 13th ends at 17:15, and the day of the 14th ends at 17:16.", "fact": "sunset-day: sunset-to-sunset · sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "The festival is kept on the day of the transit, the day counted from the sunset before it: a transit after sunset belongs to the next day. The transit falls between the sunsets of the 13th and the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106" }, { "step": "tie_break", "text": "An instant falls in one day and no other. No tie-break is needed.", "fact": "day counted from sunset → only-day · margin 18695 s" }, { "step": "counted", "text": "Mattu Pongal is kept the day after Pongal: Wednesday 14 January is the day taken above.", "fact": "follows: pongal + 1 d" }, { "step": "ruling", "text": "Mattu Pongal, Cairo, 1981: Thursday 15 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "solar", "id": "mattu-pongal", "follows": { "festival": "pongal", "days": 1 }, "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Makaradi — Makaradi snana, Magh Bihu (Assam), Tila samkranti, Pongal (S. India), Bhogi (S. India — on the day before Pongal), Mattu Pongal (S. India — on the day after Pongal)." }, { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Tamil rule: In the Tamil districts the rule is that when a samkranti takes place before sunset, the month begins on the same day, while if it takes place after sunset the month begins on the following day." } ], "rashi": "Makara", "day_from": "sunset" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-15", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "1981-01-14", "statement": "Counted from midnight", "reference": { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day." } }, { "kind": "reckoning", "id": "sunrise-day", "local_date": "1981-01-14", "statement": "Counted from sunrise (the Orissa rule)", "reference": { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Orissa rule: In Orissa the solar months of the Amli and Vilayati eras begin civilly on the same day (sunrise to next sunrise) as the samkranti, irrespective of whether this takes place before or after midnight." } } ], "quote": "In Cairo, Mattu Pongal 1981 falls on Thursday 15 January. It is kept the day after Pongal, which falls on Wednesday 14 January. The Sun enters Makara at 22:27 on Tue 13 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th. Counted from midnight, or counted from sunrise, as in Orissa, it is 14 January.", "cite": "https://ahargana.org/cairo/festivals/1981/mattu-pongal", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-01-16", "festival": "ekadashi", "name": "Putradā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34425, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-01-15T18:38:59+02:00", "utc": "1981-01-15T16:38:59Z", "ms": 348424738877.58954 }, "end": { "local": "1981-01-16T16:25:46+02:00", "utc": "1981-01-16T14:25:46Z", "ms": 348503145853.60675 }, "month": { "amanta": 9, "purnimanta": 9, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-01-15T18:38:59+02:00", "utc": "1981-01-15T16:38:59Z", "ms": 348424738877.58954 }, "end": { "local": "1981-01-16T16:25:46+02:00", "utc": "1981-01-16T14:25:46Z", "ms": 348503145853.60675 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-01-15", "window": { "start": { "local": "1981-01-15T06:52:10+02:00", "utc": "1981-01-15T04:52:10Z", "ms": 348382329737.0535 }, "end": { "local": "1981-01-15T06:52:10+02:00", "utc": "1981-01-15T04:52:10Z", "ms": 348382329737.0535 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-01-16", "window": { "start": { "local": "1981-01-16T06:52:00+02:00", "utc": "1981-01-16T04:52:00Z", "ms": 348468720461.8126 }, "end": { "local": "1981-01-16T06:52:00+02:00", "utc": "1981-01-16T04:52:00Z", "ms": 348468720461.8126 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 18:39 on Thu 15 Jan to 16:26 on Fri 16 Jan.", "fact": "1981-01-15T16:38:59Z → 1981-01-16T14:25:46Z" }, { "step": "kaala", "text": "Sunrise is at 06:52 on the 15th and 06:52 on the 16th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 15th and is on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 34425 s" }, { "step": "ruling", "text": "Putradā Ekādaśī, Cairo, 1981: Friday 16 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-16", "confidence": "determinate" } ], "quote": "In Cairo, Putradā Ekādaśī 1981 falls on Friday 16 January. Ekādaśī runs from 18:39 on Thu 15 Jan to 16:26 on Fri 16 Jan and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-01-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-01-17", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 10767, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-01-17T14:19:15+02:00", "utc": "1981-01-17T12:19:15Z", "ms": 348581955203.7646 }, "end": { "local": "1981-01-18T12:25:11+02:00", "utc": "1981-01-18T10:25:11Z", "ms": 348661510618.66455 }, "month": { "amanta": 9, "purnimanta": 9, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-01-17T14:19:15+02:00", "utc": "1981-01-17T12:19:15Z", "ms": 348581955203.7646 }, "end": { "local": "1981-01-18T12:25:11+02:00", "utc": "1981-01-18T10:25:11Z", "ms": 348661510618.66455 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-01-17", "window": { "start": { "local": "1981-01-17T17:18:43+02:00", "utc": "1981-01-17T15:18:43Z", "ms": 348592722518.5738 }, "end": { "local": "1981-01-17T19:07:06+02:00", "utc": "1981-01-17T17:07:06Z", "ms": 348599225763.6605 } }, "covered_min": 108, "window_min": 108, "qualifies": true }, { "local_date": "1981-01-18", "window": { "start": { "local": "1981-01-18T17:19:34+02:00", "utc": "1981-01-18T15:19:34Z", "ms": 348679174135.60657 }, "end": { "local": "1981-01-18T19:07:49+02:00", "utc": "1981-01-18T17:07:49Z", "ms": 348685668590.7303 } }, "covered_min": 0, "window_min": 108, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 14:19 on Sat 17 Jan to 12:25 on Sun 18 Jan.", "fact": "1981-01-17T12:19:15Z → 1981-01-18T10:25:11Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:19–19:07 on the 17th, 17:20–19:08 on the 18th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 108 of 108 minutes on the 17th and 0 of 108 on the 18th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 10767 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Saturday 17 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-17", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Saturday 17 January. Trayodaśī runs from 14:19 on Sat 17 Jan to 12:25 on Sun 18 Jan and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-01-17", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-01-23", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 39078, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-01-23T09:26:36+02:00", "utc": "1981-01-23T07:26:36Z", "ms": 349082796315.67535 }, "end": { "local": "1981-01-24T10:37:24+02:00", "utc": "1981-01-24T08:37:24Z", "ms": 349173443840.836 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-01-23T09:26:36+02:00", "utc": "1981-01-23T07:26:36Z", "ms": 349082796315.67535 }, "end": { "local": "1981-01-24T10:37:24+02:00", "utc": "1981-01-24T08:37:24Z", "ms": 349173443840.836 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-01-23", "window": { "start": { "local": "1981-01-23T20:34:13+02:00", "utc": "1981-01-23T18:34:13Z", "ms": 349122852513.4495 }, "end": { "local": "1981-01-23T20:34:13+02:00", "utc": "1981-01-23T18:34:13Z", "ms": 349122852513.4495 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-01-24", "window": { "start": { "local": "1981-01-24T21:28:42+02:00", "utc": "1981-01-24T19:28:42Z", "ms": 349212522303.1034 }, "end": { "local": "1981-01-24T21:28:42+02:00", "utc": "1981-01-24T19:28:42Z", "ms": 349212522303.1034 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 09:27 on Fri 23 Jan to 10:37 on Sat 24 Jan.", "fact": "1981-01-23T07:26:36Z → 1981-01-24T08:37:24Z" }, { "step": "kaala", "text": "Moonrise is at 20:34 on the 23rd and 21:29 on the 24th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 23rd and is not on the 24th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 39078 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Friday 23 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-23", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Friday 23 January. Caturthī runs from 09:27 on Fri 23 Jan to 10:37 on Sat 24 Jan and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-01-23", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-01-31", "festival": "ekadashi", "name": "Ṣaṭtilā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-01-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20095, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-01-30T23:48:34+02:00", "utc": "1981-01-30T21:48:34Z", "ms": 349739313714.7193 }, "end": { "local": "1981-02-01T01:10:57+02:00", "utc": "1981-01-31T23:10:57Z", "ms": 349830657094.1563 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-01-30T23:48:34+02:00", "utc": "1981-01-30T21:48:34Z", "ms": 349739313714.7193 }, "end": { "local": "1981-02-01T01:10:57+02:00", "utc": "1981-01-31T23:10:57Z", "ms": 349830657094.1563 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-01-31", "window": { "start": { "local": "1981-01-31T06:46:26+02:00", "utc": "1981-01-31T04:46:26Z", "ms": 349764386499.5939 }, "end": { "local": "1981-01-31T06:46:26+02:00", "utc": "1981-01-31T04:46:26Z", "ms": 349764386499.5939 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-02-01", "window": { "start": { "local": "1981-02-01T06:45:52+02:00", "utc": "1981-02-01T04:45:52Z", "ms": 349850751998.4572 }, "end": { "local": "1981-02-01T06:45:52+02:00", "utc": "1981-02-01T04:45:52Z", "ms": 349850751998.4572 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 23:49 on Fri 30 Jan to 01:11 on Sun 1 Feb.", "fact": "1981-01-30T21:48:34Z → 1981-01-31T23:10:57Z" }, { "step": "kaala", "text": "Sunrise is at 06:46 on the 31st and 06:46 on the 1st.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 31st and is not on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 20095 s" }, { "step": "ruling", "text": "Ṣaṭtilā Ekādaśī, Cairo, 1981: Saturday 31 January.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-01-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-01-31", "confidence": "determinate" } ], "quote": "In Cairo, Ṣaṭtilā Ekādaśī 1981 falls on Saturday 31 January. Ekādaśī runs from 23:49 on Fri 30 Jan to 01:11 on Sun 1 Feb and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-01-31", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-02-02", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23829, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-02-02T01:54:41+02:00", "utc": "1981-02-01T23:54:41Z", "ms": 349919680829.01044 }, "end": { "local": "1981-02-03T01:58:10+02:00", "utc": "1981-02-02T23:58:10Z", "ms": 350006290221.0994 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-02T01:54:41+02:00", "utc": "1981-02-01T23:54:41Z", "ms": 349919680829.01044 }, "end": { "local": "1981-02-03T01:58:10+02:00", "utc": "1981-02-02T23:58:10Z", "ms": 350006290221.0994 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-02-01", "window": { "start": { "local": "1981-02-01T17:31:44+02:00", "utc": "1981-02-01T15:31:44Z", "ms": 349889503581.04553 }, "end": { "local": "1981-02-01T19:17:32+02:00", "utc": "1981-02-01T17:17:32Z", "ms": 349895851913.51196 } }, "covered_min": 0, "window_min": 106, "qualifies": false }, { "local_date": "1981-02-02", "window": { "start": { "local": "1981-02-02T17:32:35+02:00", "utc": "1981-02-02T15:32:35Z", "ms": 349975955060.67114 }, "end": { "local": "1981-02-02T19:18:12+02:00", "utc": "1981-02-02T17:18:12Z", "ms": 349982291552.31537 } }, "covered_min": 106, "window_min": 106, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 01:55 on Mon 2 Feb to 01:58 on Tue 3 Feb.", "fact": "1981-02-01T23:54:41Z → 1981-02-02T23:58:10Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:32–19:18 on the 1st, 17:33–19:18 on the 2nd.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 106 minutes on the 1st and 106 of 106 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 23829 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Monday 2 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-02", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Monday 2 February. Trayodaśī runs from 01:55 on Mon 2 Feb to 01:58 on Tue 3 Feb and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-02-02", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/yama-tarpana", "festival": "yama-tarpana", "name": "Yama Tarpaṇa", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 10852, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-02-03T01:58:10+02:00", "utc": "1981-02-02T23:58:10Z", "ms": 350006290221.0994 }, "end": { "local": "1981-02-04T01:23:09+02:00", "utc": "1981-02-03T23:23:09Z", "ms": 350090588500.2604 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-03T01:58:10+02:00", "utc": "1981-02-02T23:58:10Z", "ms": 350006290221.0994 }, "end": { "local": "1981-02-04T01:23:09+02:00", "utc": "1981-02-03T23:23:09Z", "ms": 350090588500.2604 } }, "kaala": "arunodaya", "days": [ { "local_date": "1981-02-03", "window": { "start": { "local": "1981-02-03T04:59:02+02:00", "utc": "1981-02-03T02:59:02Z", "ms": 350017142256.3584 }, "end": { "local": "1981-02-03T06:44:39+02:00", "utc": "1981-02-03T04:44:39Z", "ms": 350023478748.0026 } }, "covered_min": 106, "window_min": 106, "qualifies": true }, { "local_date": "1981-02-04", "window": { "start": { "local": "1981-02-04T04:58:36+02:00", "utc": "1981-02-04T02:58:36Z", "ms": 350103515543.2136 }, "end": { "local": "1981-02-04T06:44:00+02:00", "utc": "1981-02-04T04:44:00Z", "ms": 350109840038.8768 } }, "covered_min": 0, "window_min": 105, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 01:58 on Tue 3 Feb to 01:23 on Wed 4 Feb.", "fact": "1981-02-02T23:58:10Z → 1981-02-03T23:23:09Z" }, { "step": "kaala", "text": "Aruṇodaya is 2 muhūrtas before sunrise: 04:59–06:45 on the 3rd, 04:59–06:44 on the 4th.", "fact": "arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during aruṇodaya. It covers 106 of 106 minutes on the 3rd and 0 of 105 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one dawn qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 10852 s" }, { "step": "ruling", "text": "Yama Tarpaṇa, Cairo, 1981: Tuesday 3 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "yama-tarpana", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 14 Yama tarpana (covering a period of 4 ghatikas before sunrise)" } ], "kaala": "arunodaya", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-03", "confidence": "determinate" } ], "quote": "In Cairo, Yama Tarpaṇa 1981 falls on Tuesday 3 February. Caturdaśī runs from 01:58 on Tue 3 Feb to 01:23 on Wed 4 Feb and covers all of aruṇodaya that dawn.", "cite": "https://ahargana.org/cairo/festivals/1981/yama-tarpana", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-02-03", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3025, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-02-03T01:58:10+02:00", "utc": "1981-02-02T23:58:10Z", "ms": 350006290221.0994 }, "end": { "local": "1981-02-04T01:23:09+02:00", "utc": "1981-02-03T23:23:09Z", "ms": 350090588500.2604 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-03T01:58:10+02:00", "utc": "1981-02-02T23:58:10Z", "ms": 350006290221.0994 }, "end": { "local": "1981-02-04T01:23:09+02:00", "utc": "1981-02-03T23:23:09Z", "ms": 350090588500.2604 } }, "kaala": "nishita", "days": [ { "local_date": "1981-02-02", "window": { "start": { "local": "1981-02-02T23:44:37+02:00", "utc": "1981-02-02T21:44:37Z", "ms": 349998276904.3369 }, "end": { "local": "1981-02-03T00:32:37+02:00", "utc": "1981-02-02T22:32:37Z", "ms": 350001156904.3369 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-02-03", "window": { "start": { "local": "1981-02-03T23:44:43+02:00", "utc": "1981-02-03T21:44:43Z", "ms": 350084683180.14 }, "end": { "local": "1981-02-04T00:32:43+02:00", "utc": "1981-02-03T22:32:43Z", "ms": 350087563180.14 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 01:58 on Tue 3 Feb to 01:23 on Wed 4 Feb.", "fact": "1981-02-02T23:58:10Z → 1981-02-03T23:23:09Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:45–00:33 on the 2nd, 23:45–00:33 on the 3rd.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 2nd and 48 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 3025 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Tuesday 3 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-03", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Tuesday 3 February. Caturdaśī runs from 01:58 on Tue 3 Feb to 01:23 on Wed 4 Feb and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-02-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/tila-chaturthi", "festival": "tila-chaturthi", "name": "Tila Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2628, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-02-07T18:20:37+02:00", "utc": "1981-02-07T16:20:37Z", "ms": 350410836560.28217 }, "end": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-07T18:20:37+02:00", "utc": "1981-02-07T16:20:37Z", "ms": 350410836560.28217 }, "end": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-02-07", "window": { "start": { "local": "1981-02-07T17:36:49+02:00", "utc": "1981-02-07T15:36:49Z", "ms": 350408208722.15607 }, "end": { "local": "1981-02-07T19:21:24+02:00", "utc": "1981-02-07T17:21:24Z", "ms": 350414483796.29736 } }, "covered_min": 61, "window_min": 105, "qualifies": true }, { "local_date": "1981-02-08", "window": { "start": { "local": "1981-02-08T17:37:39+02:00", "utc": "1981-02-08T15:37:39Z", "ms": 350494658558.19934 }, "end": { "local": "1981-02-08T19:22:01+02:00", "utc": "1981-02-08T17:22:01Z", "ms": 350500920945.25684 } }, "covered_min": 0, "window_min": 104, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 18:21 on Sat 7 Feb to 15:57 on Sun 8 Feb.", "fact": "1981-02-07T16:20:37Z → 1981-02-08T13:56:56Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:37–19:21 on the 7th, 17:38–19:22 on the 8th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during pradoṣa. It covers 61 of 105 minutes on the 7th and 0 of 104 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 2628 s" }, { "step": "ruling", "text": "Tila Caturthī, Cairo, 1981: Saturday 7 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "tila-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 4 Tila caturthi and Kunda caturthi (pradosavyapini), Varada caturthi (Bengal & Orissa), Ganesa caturthi, Ganesa jayanti (madhyahnavyapini purvaviddha)." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-07", "confidence": "determinate" } ], "quote": "In Cairo, Tila Caturthī 1981 falls on Saturday 7 February. Caturthī runs from 18:21 on Sat 7 Feb to 15:57 on Sun 8 Feb and covers 61 of 105 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/tila-chaturthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ganesha-jayanti", "festival": "ganesha-jayanti", "name": "Gaṇeśa Jayantī", "everyday": "Maghi Ganesh Jayanti", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12211, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-02-07T18:20:37+02:00", "utc": "1981-02-07T16:20:37Z", "ms": 350410836560.28217 }, "end": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-07T18:20:37+02:00", "utc": "1981-02-07T16:20:37Z", "ms": 350410836560.28217 }, "end": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-02-07", "window": { "start": { "local": "1981-02-07T11:45:22+02:00", "utc": "1981-02-07T09:45:22Z", "ms": 350387122269.1465 }, "end": { "local": "1981-02-07T12:33:22+02:00", "utc": "1981-02-07T10:33:22Z", "ms": 350390002269.1465 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-02-08", "window": { "start": { "local": "1981-02-08T11:45:25+02:00", "utc": "1981-02-08T09:45:25Z", "ms": 350473525168.2075 }, "end": { "local": "1981-02-08T12:33:25+02:00", "utc": "1981-02-08T10:33:25Z", "ms": 350476405168.2075 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 18:21 on Sat 7 Feb to 15:57 on Sun 8 Feb.", "fact": "1981-02-07T16:20:37Z → 1981-02-08T13:56:56Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 7th, 11:45–12:33 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 7th and 48 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 12211 s" }, { "step": "ruling", "text": "Gaṇeśa Jayantī, Cairo, 1981: Sunday 8 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ganesha-jayanti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 4 Tila caturthi and Kunda caturthi (pradosavyapini), Varada caturthi (Bengal & Orissa), Ganesa caturthi, Ganesa jayanti (madhyahnavyapini purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-08", "confidence": "determinate" } ], "quote": "In Cairo, Gaṇeśa Jayantī (Maghi Ganesh Jayanti) 1981 falls on Sunday 8 February. Caturthī runs from 18:21 on Sat 7 Feb to 15:57 on Sun 8 Feb and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/ganesha-jayanti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shri-panchami", "festival": "shri-panchami", "name": "Śrī Pañcamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3447, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 }, "end": { "local": "1981-02-09T13:30:54+02:00", "utc": "1981-02-09T11:30:54Z", "ms": 350566254077.86145 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 }, "end": { "local": "1981-02-09T13:30:54+02:00", "utc": "1981-02-09T11:30:54Z", "ms": 350566254077.86145 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-02-08", "window": { "start": { "local": "1981-02-08T11:45:25+02:00", "utc": "1981-02-08T09:45:25Z", "ms": 350473525168.2075 }, "end": { "local": "1981-02-08T12:33:25+02:00", "utc": "1981-02-08T10:33:25Z", "ms": 350476405168.2075 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-02-09", "window": { "start": { "local": "1981-02-09T11:45:27+02:00", "utc": "1981-02-09T09:45:27Z", "ms": 350559927257.0257 }, "end": { "local": "1981-02-09T12:33:27+02:00", "utc": "1981-02-09T10:33:27Z", "ms": 350562807257.0257 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 15:57 on Sun 8 Feb to 13:31 on Mon 9 Feb.", "fact": "1981-02-08T13:56:56Z → 1981-02-09T11:30:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 8th, 11:45–12:33 on the 9th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 0 of 48 minutes on the 8th and 48 of 48 on the 9th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 3447 s" }, { "step": "ruling", "text": "Śrī Pañcamī, Cairo, 1981: Monday 9 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shri-panchami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Sri Pancami (purvaviddha), Sarasvati puja (Bengal), Vasanta pancami, Madana pancami." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-09", "confidence": "determinate" } ], "quote": "In Cairo, Śrī Pañcamī 1981 falls on Monday 9 February. Pañcamī runs from 15:57 on Sun 8 Feb to 13:31 on Mon 9 Feb and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/shri-panchami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vasanta-panchami", "festival": "vasanta-panchami", "name": "Vasanta Pañcamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3447, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 }, "end": { "local": "1981-02-09T13:30:54+02:00", "utc": "1981-02-09T11:30:54Z", "ms": 350566254077.86145 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-08T15:56:56+02:00", "utc": "1981-02-08T13:56:56Z", "ms": 350488615853.4666 }, "end": { "local": "1981-02-09T13:30:54+02:00", "utc": "1981-02-09T11:30:54Z", "ms": 350566254077.86145 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-02-08", "window": { "start": { "local": "1981-02-08T11:45:25+02:00", "utc": "1981-02-08T09:45:25Z", "ms": 350473525168.2075 }, "end": { "local": "1981-02-08T12:33:25+02:00", "utc": "1981-02-08T10:33:25Z", "ms": 350476405168.2075 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-02-09", "window": { "start": { "local": "1981-02-09T11:45:27+02:00", "utc": "1981-02-09T09:45:27Z", "ms": 350559927257.0257 }, "end": { "local": "1981-02-09T12:33:27+02:00", "utc": "1981-02-09T10:33:27Z", "ms": 350562807257.0257 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 15:57 on Sun 8 Feb to 13:31 on Mon 9 Feb.", "fact": "1981-02-08T13:56:56Z → 1981-02-09T11:30:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 8th, 11:45–12:33 on the 9th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 0 of 48 minutes on the 8th and 48 of 48 on the 9th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 3447 s" }, { "step": "ruling", "text": "Vasanta Pañcamī, Cairo, 1981: Monday 9 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vasanta-panchami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Sri Pancami (purvaviddha), Sarasvati puja (Bengal), Vasanta pancami, Madana pancami." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-09", "confidence": "determinate" } ], "quote": "In Cairo, Vasanta Pañcamī 1981 falls on Monday 9 February. Pañcamī runs from 15:57 on Sun 8 Feb to 13:31 on Mon 9 Feb and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vasanta-panchami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ratha-saptami", "festival": "ratha-saptami", "name": "Ratha Saptamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8030, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-02-10T11:07:58+02:00", "utc": "1981-02-10T09:07:58Z", "ms": 350644077505.1237 }, "end": { "local": "1981-02-11T08:52:42+02:00", "utc": "1981-02-11T06:52:42Z", "ms": 350722361753.4865 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-10T11:07:58+02:00", "utc": "1981-02-10T09:07:58Z", "ms": 350644077505.1237 }, "end": { "local": "1981-02-11T08:52:42+02:00", "utc": "1981-02-11T06:52:42Z", "ms": 350722361753.4865 } }, "kaala": "arunodaya", "days": [ { "local_date": "1981-02-10", "window": { "start": { "local": "1981-02-10T04:55:30+02:00", "utc": "1981-02-10T02:55:30Z", "ms": 350621730310.3589 }, "end": { "local": "1981-02-10T06:39:40+02:00", "utc": "1981-02-10T04:39:40Z", "ms": 350627979888.4263 } }, "covered_min": 0, "window_min": 104, "qualifies": false }, { "local_date": "1981-02-11", "window": { "start": { "local": "1981-02-11T04:54:55+02:00", "utc": "1981-02-11T02:54:55Z", "ms": 350708095432.83466 }, "end": { "local": "1981-02-11T06:38:52+02:00", "utc": "1981-02-11T04:38:52Z", "ms": 350714332085.25073 } }, "covered_min": 104, "window_min": 104, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 11:08 on Tue 10 Feb to 08:53 on Wed 11 Feb.", "fact": "1981-02-10T09:07:58Z → 1981-02-11T06:52:42Z" }, { "step": "kaala", "text": "Aruṇodaya is 2 muhūrtas before sunrise: 04:56–06:40 on the 10th, 04:55–06:39 on the 11th.", "fact": "arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during aruṇodaya. It covers 0 of 104 minutes on the 10th and 104 of 104 on the 11th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one dawn qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 8030 s" }, { "step": "ruling", "text": "Ratha Saptamī, Cairo, 1981: Wednesday 11 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ratha-saptami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 7 Ratha saptami (covering 4 ghatikas before sunrise), Acala saptami, Vidhana saptami, Arogya saptami [purvaviddha]." } ], "kaala": "arunodaya", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-11", "confidence": "determinate" } ], "quote": "In Cairo, Ratha Saptamī 1981 falls on Wednesday 11 February. Saptamī runs from 11:08 on Tue 10 Feb to 08:53 on Wed 11 Feb and covers all of aruṇodaya that dawn.", "cite": "https://ahargana.org/cairo/festivals/1981/ratha-saptami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-02-14", "festival": "ekadashi", "name": "Jayā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11394, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-02-14T03:26:28+02:00", "utc": "1981-02-14T01:26:28Z", "ms": 350961987634.47577 }, "end": { "local": "1981-02-15T02:12:12+02:00", "utc": "1981-02-15T00:12:12Z", "ms": 351043931757.07263 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-14T03:26:28+02:00", "utc": "1981-02-14T01:26:28Z", "ms": 350961987634.47577 }, "end": { "local": "1981-02-15T02:12:12+02:00", "utc": "1981-02-15T00:12:12Z", "ms": 351043931757.07263 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-02-14", "window": { "start": { "local": "1981-02-14T06:36:22+02:00", "utc": "1981-02-14T04:36:22Z", "ms": 350973381567.39874 }, "end": { "local": "1981-02-14T06:36:22+02:00", "utc": "1981-02-14T04:36:22Z", "ms": 350973381567.39874 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-02-15", "window": { "start": { "local": "1981-02-15T06:35:29+02:00", "utc": "1981-02-15T04:35:29Z", "ms": 351059729123.17694 }, "end": { "local": "1981-02-15T06:35:29+02:00", "utc": "1981-02-15T04:35:29Z", "ms": 351059729123.17694 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 03:26 on Sat 14 Feb to 02:12 on Sun 15 Feb.", "fact": "1981-02-14T01:26:28Z → 1981-02-15T00:12:12Z" }, { "step": "kaala", "text": "Sunrise is at 06:36 on the 14th and 06:35 on the 15th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 14th and is not on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 11394 s" }, { "step": "ruling", "text": "Jayā Ekādaśī, Cairo, 1981: Saturday 14 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-14", "confidence": "determinate" } ], "quote": "In Cairo, Jayā Ekādaśī 1981 falls on Saturday 14 February. Ekādaśī runs from 03:26 on Sat 14 Feb to 02:12 on Sun 15 Feb and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-02-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/bhishma-dvadashi", "festival": "bhishma-dvadashi", "name": "Bhīṣma Dvādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34391, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-02-15T02:12:12+02:00", "utc": "1981-02-15T00:12:12Z", "ms": 351043931757.07263 }, "end": { "local": "1981-02-16T01:18:20+02:00", "utc": "1981-02-15T23:18:20Z", "ms": 351127100008.5359 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-15T02:12:12+02:00", "utc": "1981-02-15T00:12:12Z", "ms": 351043931757.07263 }, "end": { "local": "1981-02-16T01:18:20+02:00", "utc": "1981-02-15T23:18:20Z", "ms": 351127100008.5359 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-02-15", "window": { "start": { "local": "1981-02-15T11:45:23+02:00", "utc": "1981-02-15T09:45:23Z", "ms": 351078323171.6111 }, "end": { "local": "1981-02-15T12:33:23+02:00", "utc": "1981-02-15T10:33:23Z", "ms": 351081203171.6111 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-02-16", "window": { "start": { "local": "1981-02-16T11:45:20+02:00", "utc": "1981-02-16T09:45:20Z", "ms": 351164719825.24225 }, "end": { "local": "1981-02-16T12:33:20+02:00", "utc": "1981-02-16T10:33:20Z", "ms": 351167599825.24225 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 02:12 on Sun 15 Feb to 01:18 on Mon 16 Feb.", "fact": "1981-02-15T00:12:12Z → 1981-02-15T23:18:20Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 15th, 11:45–12:33 on the 16th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 15th and 0 of 48 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 34391 s" }, { "step": "ruling", "text": "Bhīṣma Dvādaśī, Cairo, 1981: Sunday 15 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "bhishma-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Bhisma dvadasi (purvaviddha), Amalaki dvadasi, Santana dvadasi, Varaha dvadasi" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-15", "confidence": "determinate" } ], "quote": "In Cairo, Bhīṣma Dvādaśī 1981 falls on Sunday 15 February. Dvādaśī runs from 02:12 on Sun 15 Feb to 01:18 on Mon 16 Feb and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/bhishma-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-02-16", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 19203, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-02-16T01:18:20+02:00", "utc": "1981-02-15T23:18:20Z", "ms": 351127100008.5359 }, "end": { "local": "1981-02-17T00:46:44+02:00", "utc": "1981-02-16T22:46:44Z", "ms": 351211604178.06757 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-16T01:18:20+02:00", "utc": "1981-02-15T23:18:20Z", "ms": 351127100008.5359 }, "end": { "local": "1981-02-17T00:46:44+02:00", "utc": "1981-02-16T22:46:44Z", "ms": 351211604178.06757 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-02-15", "window": { "start": { "local": "1981-02-15T17:43:17+02:00", "utc": "1981-02-15T15:43:17Z", "ms": 351099797220.04517 }, "end": { "local": "1981-02-15T19:26:08+02:00", "utc": "1981-02-15T17:26:08Z", "ms": 351105967669.9544 } }, "covered_min": 0, "window_min": 103, "qualifies": false }, { "local_date": "1981-02-16", "window": { "start": { "local": "1981-02-16T17:44:04+02:00", "utc": "1981-02-16T15:44:04Z", "ms": 351186244056.1201 }, "end": { "local": "1981-02-16T19:26:41+02:00", "utc": "1981-02-16T17:26:41Z", "ms": 351192400983.64136 } }, "covered_min": 103, "window_min": 103, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 01:18 on Mon 16 Feb to 00:47 on Tue 17 Feb.", "fact": "1981-02-15T23:18:20Z → 1981-02-16T22:46:44Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:43–19:26 on the 15th, 17:44–19:27 on the 16th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 103 minutes on the 15th and 103 of 103 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 19203 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Monday 16 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-16", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Monday 16 February. Trayodaśī runs from 01:18 on Mon 16 Feb to 00:47 on Tue 17 Feb and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-02-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/maghi-purnima", "festival": "maghi-purnima", "name": "Māghī Pūrṇimā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 38812, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-02-18T00:39:23+02:00", "utc": "1981-02-17T22:39:23Z", "ms": 351297562928.61835 }, "end": { "local": "1981-02-19T00:58:14+02:00", "utc": "1981-02-18T22:58:14Z", "ms": 351385093864.15186 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "1981-02-18T00:39:23+02:00", "utc": "1981-02-17T22:39:23Z", "ms": 351297562928.61835 }, "end": { "local": "1981-02-19T00:58:14+02:00", "utc": "1981-02-18T22:58:14Z", "ms": 351385093864.15186 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-02-18", "window": { "start": { "local": "1981-02-18T11:45:11+02:00", "utc": "1981-02-18T09:45:11Z", "ms": 351337510981.25397 }, "end": { "local": "1981-02-18T12:33:11+02:00", "utc": "1981-02-18T10:33:11Z", "ms": 351340390981.25397 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-02-19", "window": { "start": { "local": "1981-02-19T11:45:06+02:00", "utc": "1981-02-19T09:45:06Z", "ms": 351423905518.1484 }, "end": { "local": "1981-02-19T12:33:06+02:00", "utc": "1981-02-19T10:33:06Z", "ms": 351426785518.1484 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 00:39 on Wed 18 Feb to 00:58 on Thu 19 Feb.", "fact": "1981-02-17T22:39:23Z → 1981-02-18T22:58:14Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 18th, 11:45–12:33 on the 19th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 18th and 0 of 48 on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 38812 s" }, { "step": "ruling", "text": "Māghī Pūrṇimā, Cairo, 1981: Wednesday 18 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "maghi-purnima", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Maghi purnima (paraviddha)" } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-18", "confidence": "determinate" } ], "quote": "In Cairo, Māghī Pūrṇimā 1981 falls on Wednesday 18 February. Pūrṇimā runs from 00:39 on Wed 18 Feb to 00:58 on Thu 19 Feb and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/maghi-purnima", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-02-22", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-02-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30641, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-02-22T04:42:16+02:00", "utc": "1981-02-22T02:42:16Z", "ms": 351657736306.9456 }, "end": { "local": "1981-02-23T06:48:21+02:00", "utc": "1981-02-23T04:48:21Z", "ms": 351751701193.31195 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-02-22T04:42:16+02:00", "utc": "1981-02-22T02:42:16Z", "ms": 351657736306.9456 }, "end": { "local": "1981-02-23T06:48:21+02:00", "utc": "1981-02-23T04:48:21Z", "ms": 351751701193.31195 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-02-21", "window": { "start": { "local": "1981-02-21T20:11:35+02:00", "utc": "1981-02-21T18:11:35Z", "ms": 351627095479.33514 }, "end": { "local": "1981-02-21T20:11:35+02:00", "utc": "1981-02-21T18:11:35Z", "ms": 351627095479.33514 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-02-22", "window": { "start": { "local": "1981-02-22T21:04:30+02:00", "utc": "1981-02-22T19:04:30Z", "ms": 351716669843.82227 }, "end": { "local": "1981-02-22T21:04:30+02:00", "utc": "1981-02-22T19:04:30Z", "ms": 351716669843.82227 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 04:42 on Sun 22 Feb to 06:48 on Mon 23 Feb.", "fact": "1981-02-22T02:42:16Z → 1981-02-23T04:48:21Z" }, { "step": "kaala", "text": "Moonrise is at 20:12 on the 21st and 21:04 on the 22nd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 21st and is on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 30641 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Sunday 22 February.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-02-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-02-22", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Sunday 22 February. Caturthī runs from 04:42 on Sun 22 Feb to 06:48 on Mon 23 Feb and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-02-22", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-03-02", "festival": "ekadashi", "name": "Vijayā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 40797, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-03-01T18:48:15+02:00", "utc": "1981-03-01T16:48:15Z", "ms": 352313295094.4754 }, "end": { "local": "1981-03-02T18:59:27+02:00", "utc": "1981-03-02T16:59:27Z", "ms": 352400367270.84766 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-01T18:48:15+02:00", "utc": "1981-03-01T16:48:15Z", "ms": 352313295094.4754 }, "end": { "local": "1981-03-02T18:59:27+02:00", "utc": "1981-03-02T16:59:27Z", "ms": 352400367270.84766 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-03-02", "window": { "start": { "local": "1981-03-02T06:20:30+02:00", "utc": "1981-03-02T04:20:30Z", "ms": 352354829913.35913 }, "end": { "local": "1981-03-02T06:20:30+02:00", "utc": "1981-03-02T04:20:30Z", "ms": 352354829913.35913 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-03-03", "window": { "start": { "local": "1981-03-03T06:19:24+02:00", "utc": "1981-03-03T04:19:24Z", "ms": 352441163850.7534 }, "end": { "local": "1981-03-03T06:19:24+02:00", "utc": "1981-03-03T04:19:24Z", "ms": 352441163850.7534 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 18:48 on Sun 1 Mar to 18:59 on Mon 2 Mar.", "fact": "1981-03-01T16:48:15Z → 1981-03-02T16:59:27Z" }, { "step": "kaala", "text": "Sunrise is at 06:20 on the 2nd and 06:19 on the 3rd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 2nd and is not on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 40797 s" }, { "step": "ruling", "text": "Vijayā Ekādaśī, Cairo, 1981: Monday 2 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-02", "confidence": "determinate" } ], "quote": "In Cairo, Vijayā Ekādaśī 1981 falls on Monday 2 March. Ekādaśī runs from 18:48 on Sun 1 Mar to 18:59 on Mon 2 Mar and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-03-02", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-03-03", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1710, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-03-03T18:23:32+02:00", "utc": "1981-03-03T16:23:32Z", "ms": 352484612003.8966 }, "end": { "local": "1981-03-04T17:02:51+02:00", "utc": "1981-03-04T15:02:51Z", "ms": 352566170737.61273 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-03T18:23:32+02:00", "utc": "1981-03-03T16:23:32Z", "ms": 352484612003.8966 }, "end": { "local": "1981-03-04T17:02:51+02:00", "utc": "1981-03-04T15:02:51Z", "ms": 352566170737.61273 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-03-03", "window": { "start": { "local": "1981-03-03T17:55:02+02:00", "utc": "1981-03-03T15:55:02Z", "ms": 352482901835.5865 }, "end": { "local": "1981-03-03T19:34:08+02:00", "utc": "1981-03-03T17:34:08Z", "ms": 352488847882.5897 } }, "covered_min": 71, "window_min": 99, "qualifies": true }, { "local_date": "1981-03-04", "window": { "start": { "local": "1981-03-04T17:55:43+02:00", "utc": "1981-03-04T15:55:43Z", "ms": 352569342941.1035 }, "end": { "local": "1981-03-04T19:34:35+02:00", "utc": "1981-03-04T17:34:35Z", "ms": 352575274542.5348 } }, "covered_min": 0, "window_min": 99, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 18:24 on Tue 3 Mar to 17:03 on Wed 4 Mar.", "fact": "1981-03-03T16:23:32Z → 1981-03-04T15:02:51Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:55–19:34 on the 3rd, 17:56–19:35 on the 4th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 71 of 99 minutes on the 3rd and 0 of 99 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 1710 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Tuesday 3 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-03", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Tuesday 3 March. Trayodaśī runs from 18:24 on Tue 3 Mar to 17:03 on Wed 4 Mar and covers 71 of 99 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-03-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/maha-shivaratri", "festival": "maha-shivaratri", "name": "Mahāśivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23976, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-03-04T17:02:51+02:00", "utc": "1981-03-04T15:02:51Z", "ms": 352566170737.61273 }, "end": { "local": "1981-03-05T15:02:48+02:00", "utc": "1981-03-05T13:02:48Z", "ms": 352645368207.2175 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-04T17:02:51+02:00", "utc": "1981-03-04T15:02:51Z", "ms": 352566170737.61273 }, "end": { "local": "1981-03-05T15:02:48+02:00", "utc": "1981-03-05T13:02:48Z", "ms": 352645368207.2175 } }, "kaala": "nishita", "days": [ { "local_date": "1981-03-04", "window": { "start": { "local": "1981-03-04T23:42:26+02:00", "utc": "1981-03-04T21:42:26Z", "ms": 352590146446.4708 }, "end": { "local": "1981-03-05T00:30:26+02:00", "utc": "1981-03-04T22:30:26Z", "ms": 352593026446.4708 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-03-05", "window": { "start": { "local": "1981-03-05T23:42:13+02:00", "utc": "1981-03-05T21:42:13Z", "ms": 352676532950.3513 }, "end": { "local": "1981-03-06T00:30:13+02:00", "utc": "1981-03-05T22:30:13Z", "ms": 352679412950.3513 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 17:03 on Wed 4 Mar to 15:03 on Thu 5 Mar.", "fact": "1981-03-04T15:02:51Z → 1981-03-05T13:02:48Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:42–00:30 on the 4th, 23:42–00:30 on the 5th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 4th and 0 of 48 on the 5th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: disputed → only-day · margin 23976 s" }, { "step": "ruling", "text": "Mahāśivarātri, Cairo, 1981: Wednesday 4 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "maha-shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 14 Mahasivaratri (nisithavyapini) — In some opinion it is to be observed on nisitha and in some opinion on pradosa. If occurs on two successive nisithas then according to Hemadri it is to be observed on the first day and according to Madhava, to be observed on the second day" } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "disputed", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-04", "confidence": "determinate" } ], "quote": "In Cairo, Mahāśivarātri 1981 falls on Wednesday 4 March. Caturdaśī runs from 17:03 on Wed 4 Mar to 15:03 on Thu 5 Mar and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/maha-shivaratri", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-03-09", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30313, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-03-09T03:16:36+02:00", "utc": "1981-03-09T01:16:36Z", "ms": 352948596335.34644 }, "end": { "local": "1981-03-10T00:10:27+02:00", "utc": "1981-03-09T22:10:27Z", "ms": 353023826941.47766 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-09T03:16:36+02:00", "utc": "1981-03-09T01:16:36Z", "ms": 352948596335.34644 }, "end": { "local": "1981-03-10T00:10:27+02:00", "utc": "1981-03-09T22:10:27Z", "ms": 353023826941.47766 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-03-09", "window": { "start": { "local": "1981-03-09T11:41:50+02:00", "utc": "1981-03-09T09:41:50Z", "ms": 352978909811.96094 }, "end": { "local": "1981-03-09T12:29:50+02:00", "utc": "1981-03-09T10:29:50Z", "ms": 352981789811.96094 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-03-10", "window": { "start": { "local": "1981-03-10T11:41:35+02:00", "utc": "1981-03-10T09:41:35Z", "ms": 353065294593.3816 }, "end": { "local": "1981-03-10T12:29:35+02:00", "utc": "1981-03-10T10:29:35Z", "ms": 353068174593.3816 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 03:17 on Mon 9 Mar to 00:10 on Tue 10 Mar.", "fact": "1981-03-09T01:16:36Z → 1981-03-09T22:10:27Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:42–12:30 on the 9th, 11:42–12:30 on the 10th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 9th and 0 of 48 on the 10th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 30313 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Monday 9 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-09", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Monday 9 March. Caturthī runs from 03:17 on Mon 9 Mar to 00:10 on Tue 10 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-03-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-03-16", "festival": "ekadashi", "name": "Āmalakī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 26578, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-03-15T13:30:31+02:00", "utc": "1981-03-15T11:30:31Z", "ms": 353503830509.8775 }, "end": { "local": "1981-03-16T13:27:17+02:00", "utc": "1981-03-16T11:27:17Z", "ms": 353590037378.9197 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-15T13:30:31+02:00", "utc": "1981-03-15T11:30:31Z", "ms": 353503830509.8775 }, "end": { "local": "1981-03-16T13:27:17+02:00", "utc": "1981-03-16T11:27:17Z", "ms": 353590037378.9197 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-03-15", "window": { "start": { "local": "1981-03-15T06:05:32+02:00", "utc": "1981-03-15T04:05:32Z", "ms": 353477131651.6063 }, "end": { "local": "1981-03-15T06:05:32+02:00", "utc": "1981-03-15T04:05:32Z", "ms": 353477131651.6063 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-03-16", "window": { "start": { "local": "1981-03-16T06:04:20+02:00", "utc": "1981-03-16T04:04:20Z", "ms": 353563459824.7361 }, "end": { "local": "1981-03-16T06:04:20+02:00", "utc": "1981-03-16T04:04:20Z", "ms": 353563459824.7361 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 13:31 on Sun 15 Mar to 13:27 on Mon 16 Mar.", "fact": "1981-03-15T11:30:31Z → 1981-03-16T11:27:17Z" }, { "step": "kaala", "text": "Sunrise is at 06:06 on the 15th and 06:04 on the 16th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 15th and is on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 26578 s" }, { "step": "ruling", "text": "Āmalakī Ekādaśī, Cairo, 1981: Monday 16 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-16", "confidence": "determinate" } ], "quote": "In Cairo, Āmalakī Ekādaśī 1981 falls on Monday 16 March. Ekādaśī runs from 13:31 on Sun 15 Mar to 13:27 on Mon 16 Mar and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-03-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-03-17", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12310, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-03-17T13:51:09+02:00", "utc": "1981-03-17T11:51:09Z", "ms": 353677868726.4933 }, "end": { "local": "1981-03-18T14:39:38+02:00", "utc": "1981-03-18T12:39:38Z", "ms": 353767178202.21246 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-17T13:51:09+02:00", "utc": "1981-03-17T11:51:09Z", "ms": 353677868726.4933 }, "end": { "local": "1981-03-18T14:39:38+02:00", "utc": "1981-03-18T12:39:38Z", "ms": 353767178202.21246 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-03-17", "window": { "start": { "local": "1981-03-17T18:04:11+02:00", "utc": "1981-03-17T16:04:11Z", "ms": 353693050873.4707 }, "end": { "local": "1981-03-17T19:39:53+02:00", "utc": "1981-03-17T17:39:53Z", "ms": 353698792819.39984 } }, "covered_min": 96, "window_min": 96, "qualifies": true }, { "local_date": "1981-03-18", "window": { "start": { "local": "1981-03-18T18:04:48+02:00", "utc": "1981-03-18T16:04:48Z", "ms": 353779488236.3813 }, "end": { "local": "1981-03-18T19:40:16+02:00", "utc": "1981-03-18T17:40:16Z", "ms": 353785215538.20483 } }, "covered_min": 0, "window_min": 95, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 13:51 on Tue 17 Mar to 14:40 on Wed 18 Mar.", "fact": "1981-03-17T11:51:09Z → 1981-03-18T12:39:38Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:04–19:40 on the 17th, 18:05–19:40 on the 18th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 96 of 96 minutes on the 17th and 0 of 95 on the 18th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 12310 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Tuesday 17 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-17", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Tuesday 17 March. Trayodaśī runs from 13:51 on Tue 17 Mar to 14:40 on Wed 18 Mar and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-03-17", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/holika-dahana", "festival": "holika-dahana", "name": "Holikā Dahana", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-19", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 610, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-03-19T15:50:39+02:00", "utc": "1981-03-19T13:50:39Z", "ms": 353857838979.0593 }, "end": { "local": "1981-03-20T17:22:28+02:00", "utc": "1981-03-20T15:22:28Z", "ms": 353949747999.98016 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-19T15:50:39+02:00", "utc": "1981-03-19T13:50:39Z", "ms": 353857838979.0593 }, "end": { "local": "1981-03-20T17:22:28+02:00", "utc": "1981-03-20T15:22:28Z", "ms": 353949747999.98016 } }, "kaala": "sayahna", "days": [ { "local_date": "1981-03-19", "window": { "start": { "local": "1981-03-19T15:40:29+02:00", "utc": "1981-03-19T13:40:29Z", "ms": 353857228939.6709 }, "end": { "local": "1981-03-19T18:05:25+02:00", "utc": "1981-03-19T16:05:25Z", "ms": 353865925424.57416 } }, "covered_min": 135, "window_min": 145, "qualifies": true }, { "local_date": "1981-03-20", "window": { "start": { "local": "1981-03-20T15:40:44+02:00", "utc": "1981-03-20T13:40:44Z", "ms": 353943644039.9627 }, "end": { "local": "1981-03-20T18:06:02+02:00", "utc": "1981-03-20T16:06:02Z", "ms": 353952362454.82947 } }, "covered_min": 102, "window_min": 145, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 15:51 on Thu 19 Mar to 17:22 on Fri 20 Mar.", "fact": "1981-03-19T13:50:39Z → 1981-03-20T15:22:28Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 15:40–18:05 on the 19th, 15:41–18:06 on the 20th.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during sāyāhna. It covers 135 of 145 minutes on the 19th and 102 of 145 on the 20th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Both late afternoons qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 610 s" }, { "step": "ruling", "text": "Holikā Dahana, Cairo, 1981: Thursday 19 March.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "holika-dahana", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Holika-dahana (Sayahnavyapini — it should be observed on second half of purnima at night), Dolayatra (Bengal & Orissa) (covering 4 ghatikas before sunrise of the day of festival), Holi — on the day after Holikadahana." } ], "not_evaluated": "The hour the row gives for the rite (\"it should be observed on second half of purnima at night\") is not tested: sāyāhna alone settles the day.", "kaala": "sayahna", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-19", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-19", "confidence": "boundary" } ], "quote": "In Cairo, Holikā Dahana 1981 falls on Thursday 19 March. Pūrṇimā runs from 15:51 on Thu 19 Mar to 17:22 on Fri 20 Mar and covers 135 of 145 minutes of sāyāhna that late afternoon. It also reaches the next late afternoon for 102 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/holika-dahana", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/holi", "festival": "holi", "name": "Holī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-20", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 610, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-03-19T15:50:39+02:00", "utc": "1981-03-19T13:50:39Z", "ms": 353857838979.0593 }, "end": { "local": "1981-03-20T17:22:28+02:00", "utc": "1981-03-20T15:22:28Z", "ms": 353949747999.98016 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "1981-03-19T15:50:39+02:00", "utc": "1981-03-19T13:50:39Z", "ms": 353857838979.0593 }, "end": { "local": "1981-03-20T17:22:28+02:00", "utc": "1981-03-20T15:22:28Z", "ms": 353949747999.98016 } }, "kaala": "sayahna", "days": [ { "local_date": "1981-03-19", "window": { "start": { "local": "1981-03-19T15:40:29+02:00", "utc": "1981-03-19T13:40:29Z", "ms": 353857228939.6709 }, "end": { "local": "1981-03-19T18:05:25+02:00", "utc": "1981-03-19T16:05:25Z", "ms": 353865925424.57416 } }, "covered_min": 135, "window_min": 145, "qualifies": true }, { "local_date": "1981-03-20", "window": { "start": { "local": "1981-03-20T15:40:44+02:00", "utc": "1981-03-20T13:40:44Z", "ms": 353943644039.9627 }, "end": { "local": "1981-03-20T18:06:02+02:00", "utc": "1981-03-20T16:06:02Z", "ms": 353952362454.82947 } }, "covered_min": 102, "window_min": 145, "qualifies": true } ], "follows": { "festival": "holika-dahana", "name": "Holikā Dahana", "local_date": "1981-03-19", "days": 1 }, "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 15:51 on Thu 19 Mar to 17:22 on Fri 20 Mar.", "fact": "1981-03-19T13:50:39Z → 1981-03-20T15:22:28Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 15:40–18:05 on the 19th, 15:41–18:06 on the 20th.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during sāyāhna. It covers 135 of 145 minutes on the 19th and 102 of 145 on the 20th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Both late afternoons qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 610 s" }, { "step": "counted", "text": "Holī is kept the day after Holikā Dahana: Thursday 19 March is the day taken above.", "fact": "follows: holika-dahana + 1 d" }, { "step": "ruling", "text": "Holī, Cairo, 1981: Friday 20 March.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "holi", "follows": { "festival": "holika-dahana", "days": 1 }, "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Holika-dahana (Sayahnavyapini — it should be observed on second half of purnima at night), Dolayatra (Bengal & Orissa) (covering 4 ghatikas before sunrise of the day of festival), Holi — on the day after Holikadahana." } ], "kaala": "sayahna", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-20", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-20", "confidence": "boundary" } ], "quote": "In Cairo, Holī 1981 falls on Friday 20 March. It is kept the day after Holikā Dahana, which falls on Thursday 19 March. Pūrṇimā runs from 15:51 on Thu 19 Mar to 17:22 on Fri 20 Mar and covers 135 of 145 minutes of sāyāhna on the 19th. It also reaches the next late afternoon for 102 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/holi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vasantotsava", "festival": "vasantotsava", "name": "Vasantotsava", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 38618, "anga": { "type": "tithi", "index": 15, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-03-20T17:22:28+02:00", "utc": "1981-03-20T15:22:28Z", "ms": 353949747999.98016 }, "end": { "local": "1981-03-21T19:13:27+02:00", "utc": "1981-03-21T17:13:27Z", "ms": 354042806818.16345 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-03-20T17:22:28+02:00", "utc": "1981-03-20T15:22:28Z", "ms": 353949747999.98016 }, "end": { "local": "1981-03-21T19:13:27+02:00", "utc": "1981-03-21T17:13:27Z", "ms": 354042806818.16345 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-03-21", "window": { "start": { "local": "1981-03-21T05:58:18+02:00", "utc": "1981-03-21T03:58:18Z", "ms": 353995097640.0711 }, "end": { "local": "1981-03-21T05:58:18+02:00", "utc": "1981-03-21T03:58:18Z", "ms": 353995097640.0711 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-03-22", "window": { "start": { "local": "1981-03-22T05:57:05+02:00", "utc": "1981-03-22T03:57:05Z", "ms": 354081424809.4104 }, "end": { "local": "1981-03-22T05:57:05+02:00", "utc": "1981-03-22T03:57:05Z", "ms": 354081424809.4104 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 17:22 on Fri 20 Mar to 19:13 on Sat 21 Mar.", "fact": "1981-03-20T15:22:28Z → 1981-03-21T17:13:27Z" }, { "step": "kaala", "text": "Sunrise is at 05:58 on the 21st and 05:57 on the 22nd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be current at sunrise. It is on the 21st and is not on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 38618 s" }, { "step": "ruling", "text": "Vasantotsava, Cairo, 1981: Saturday 21 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vasantotsava", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 1 Vasantotsava (current at sunrise, if occurs on two successive days, it is to be observed on the first day)." } ], "kaala": "sunrise", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-21", "confidence": "determinate" } ], "quote": "In Cairo, Vasantotsava 1981 falls on Saturday 21 March. Pratipadā runs from 17:22 on Fri 20 Mar to 19:13 on Sat 21 Mar and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/vasantotsava", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-03-24", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 10852, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-03-23T23:42:38+02:00", "utc": "1981-03-23T21:42:38Z", "ms": 354231758106.3136 }, "end": { "local": "1981-03-25T02:11:27+02:00", "utc": "1981-03-25T00:11:27Z", "ms": 354327086796.3051 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-03-23T23:42:38+02:00", "utc": "1981-03-23T21:42:38Z", "ms": 354231758106.3136 }, "end": { "local": "1981-03-25T02:11:27+02:00", "utc": "1981-03-25T00:11:27Z", "ms": 354327086796.3051 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-03-23", "window": { "start": { "local": "1981-03-23T20:41:46+02:00", "utc": "1981-03-23T18:41:46Z", "ms": 354220905742.5569 }, "end": { "local": "1981-03-23T20:41:46+02:00", "utc": "1981-03-23T18:41:46Z", "ms": 354220905742.5569 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-03-24", "window": { "start": { "local": "1981-03-24T21:34:15+02:00", "utc": "1981-03-24T19:34:15Z", "ms": 354310455464.3318 }, "end": { "local": "1981-03-24T21:34:15+02:00", "utc": "1981-03-24T19:34:15Z", "ms": 354310455464.3318 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 23:43 on Mon 23 Mar to 02:11 on Wed 25 Mar.", "fact": "1981-03-23T21:42:38Z → 1981-03-25T00:11:27Z" }, { "step": "kaala", "text": "Moonrise is at 20:42 on the 23rd and 21:34 on the 24th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 23rd and is on the 24th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 10852 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Tuesday 24 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-24", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Tuesday 24 March. Caturthī runs from 23:43 on Mon 23 Mar to 02:11 on Wed 25 Mar and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-03-24", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shitalashtami", "festival": "shitalashtami", "name": "Śītalāṣṭamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-03-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5250, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-03-28T08:49:37+02:00", "utc": "1981-03-28T06:49:37Z", "ms": 354610177460.78845 }, "end": { "local": "1981-03-29T10:08:33+02:00", "utc": "1981-03-29T08:08:33Z", "ms": 354701313181.9542 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-03-28T08:49:37+02:00", "utc": "1981-03-28T06:49:37Z", "ms": 354610177460.78845 }, "end": { "local": "1981-03-29T10:08:33+02:00", "utc": "1981-03-29T08:08:33Z", "ms": 354701313181.9542 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-03-28", "window": { "start": { "local": "1981-03-28T11:36:21+02:00", "utc": "1981-03-28T09:36:21Z", "ms": 354620181285.55005 }, "end": { "local": "1981-03-28T12:24:21+02:00", "utc": "1981-03-28T10:24:21Z", "ms": 354623061285.55005 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-03-29", "window": { "start": { "local": "1981-03-29T11:36:03+02:00", "utc": "1981-03-29T09:36:03Z", "ms": 354706563131.53845 }, "end": { "local": "1981-03-29T12:24:03+02:00", "utc": "1981-03-29T10:24:03Z", "ms": 354709443131.53845 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 08:50 on Sat 28 Mar to 10:09 on Sun 29 Mar.", "fact": "1981-03-28T06:49:37Z → 1981-03-29T08:08:33Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:36–12:24 on the 28th, 11:36–12:24 on the 29th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 28th and 0 of 48 on the 29th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 5250 s" }, { "step": "ruling", "text": "Śītalāṣṭamī, Cairo, 1981: Saturday 28 March.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shitalashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 8 Sitalastami, (purvaviddha)" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-03-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-03-28", "confidence": "determinate" } ], "quote": "In Cairo, Śītalāṣṭamī 1981 falls on Saturday 28 March. Aṣṭamī runs from 08:50 on Sat 28 Mar to 10:09 on Sun 29 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/shitalashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-04-01", "festival": "ekadashi", "name": "Pāpamocanī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13215, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-03-31T10:29:48+02:00", "utc": "1981-03-31T08:29:48Z", "ms": 354875388241.33105 }, "end": { "local": "1981-04-01T09:25:13+02:00", "utc": "1981-04-01T07:25:13Z", "ms": 354957913396.8219 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-03-31T10:29:48+02:00", "utc": "1981-03-31T08:29:48Z", "ms": 354875388241.33105 }, "end": { "local": "1981-04-01T09:25:13+02:00", "utc": "1981-04-01T07:25:13Z", "ms": 354957913396.8219 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-03-31", "window": { "start": { "local": "1981-03-31T05:46:10+02:00", "utc": "1981-03-31T03:46:10Z", "ms": 354858370190.6369 }, "end": { "local": "1981-03-31T05:46:10+02:00", "utc": "1981-03-31T03:46:10Z", "ms": 354858370190.6369 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-04-01", "window": { "start": { "local": "1981-04-01T05:44:58+02:00", "utc": "1981-04-01T03:44:58Z", "ms": 354944698078.42737 }, "end": { "local": "1981-04-01T05:44:58+02:00", "utc": "1981-04-01T03:44:58Z", "ms": 354944698078.42737 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 10:30 on Tue 31 Mar to 09:25 on Wed 1 Apr.", "fact": "1981-03-31T08:29:48Z → 1981-04-01T07:25:13Z" }, { "step": "kaala", "text": "Sunrise is at 05:46 on the 31st and 05:45 on the 1st.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 31st and is on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 13215 s" }, { "step": "ruling", "text": "Pāpamocanī Ekādaśī, Cairo, 1981: Wednesday 1 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-01", "confidence": "determinate" } ], "quote": "In Cairo, Pāpamocanī Ekādaśī 1981 falls on Wednesday 1 April. Ekādaśī runs from 10:30 on Tue 31 Mar to 09:25 on Wed 1 Apr and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-04-01", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-04-02", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33154, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-04-02T07:32:43+02:00", "utc": "1981-04-02T05:32:43Z", "ms": 355037563482.32886 }, "end": { "local": "1981-04-03T04:58:20+02:00", "utc": "1981-04-03T02:58:20Z", "ms": 355114699891.5753 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-02T07:32:43+02:00", "utc": "1981-04-02T05:32:43Z", "ms": 355037563482.32886 }, "end": { "local": "1981-04-03T04:58:20+02:00", "utc": "1981-04-03T02:58:20Z", "ms": 355114699891.5753 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-04-01", "window": { "start": { "local": "1981-04-01T18:13:20+02:00", "utc": "1981-04-01T16:13:20Z", "ms": 354989600215.3336 }, "end": { "local": "1981-04-01T19:45:24+02:00", "utc": "1981-04-01T17:45:24Z", "ms": 354995123678.81476 } }, "covered_min": 0, "window_min": 92, "qualifies": false }, { "local_date": "1981-04-02", "window": { "start": { "local": "1981-04-02T18:13:57+02:00", "utc": "1981-04-02T16:13:57Z", "ms": 355076036551.6725 }, "end": { "local": "1981-04-02T19:45:46+02:00", "utc": "1981-04-02T17:45:46Z", "ms": 355081545618.7652 } }, "covered_min": 92, "window_min": 92, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 07:33 on Thu 2 Apr to 04:58 on Fri 3 Apr.", "fact": "1981-04-02T05:32:43Z → 1981-04-03T02:58:20Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:13–19:45 on the 1st, 18:14–19:46 on the 2nd.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 92 minutes on the 1st and 92 of 92 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 33154 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Thursday 2 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-02", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Thursday 2 April. Trayodaśī runs from 07:33 on Thu 2 Apr to 04:58 on Fri 3 Apr and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-04-02", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-04-03", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5314, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-04-03T04:58:20+02:00", "utc": "1981-04-03T02:58:20Z", "ms": 355114699891.5753 }, "end": { "local": "1981-04-04T01:50:32+02:00", "utc": "1981-04-03T23:50:32Z", "ms": 355189832140.00006 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-03T04:58:20+02:00", "utc": "1981-04-03T02:58:20Z", "ms": 355114699891.5753 }, "end": { "local": "1981-04-04T01:50:32+02:00", "utc": "1981-04-03T23:50:32Z", "ms": 355189832140.00006 } }, "kaala": "nishita", "days": [ { "local_date": "1981-04-02", "window": { "start": { "local": "1981-04-02T23:34:16+02:00", "utc": "1981-04-02T21:34:16Z", "ms": 355095255553.27026 }, "end": { "local": "1981-04-03T00:22:16+02:00", "utc": "1981-04-02T22:22:16Z", "ms": 355098135553.27026 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-04-03", "window": { "start": { "local": "1981-04-03T23:33:58+02:00", "utc": "1981-04-03T21:33:58Z", "ms": 355181638052.48254 }, "end": { "local": "1981-04-04T00:21:58+02:00", "utc": "1981-04-03T22:21:58Z", "ms": 355184518052.48254 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 04:58 on Fri 3 Apr to 01:51 on Sat 4 Apr.", "fact": "1981-04-03T02:58:20Z → 1981-04-03T23:50:32Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:34–00:22 on the 2nd, 23:34–00:22 on the 3rd.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 2nd and 48 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 5314 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Friday 3 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-03", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Friday 3 April. Caturdaśī runs from 04:58 on Fri 3 Apr to 01:51 on Sat 4 Apr and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-04-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/navaratra-arambha-caitra", "festival": "navaratra-arambha-caitra", "name": "Navarātrārambha (Caitra)", "everyday": "Chaitra Navratri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22442, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-04-04T22:19:26+02:00", "utc": "1981-04-04T20:19:26Z", "ms": 355263566231.01166 }, "end": { "local": "1981-04-05T18:36:01+02:00", "utc": "1981-04-05T16:36:01Z", "ms": 355336560631.19214 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-04T22:19:26+02:00", "utc": "1981-04-04T20:19:26Z", "ms": 355263566231.01166 }, "end": { "local": "1981-04-05T18:36:01+02:00", "utc": "1981-04-05T16:36:01Z", "ms": 355336560631.19214 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-04", "window": { "start": { "local": "1981-04-04T11:34:16+02:00", "utc": "1981-04-04T09:34:16Z", "ms": 355224856247.23126 }, "end": { "local": "1981-04-04T12:22:16+02:00", "utc": "1981-04-04T10:22:16Z", "ms": 355227736247.23126 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-04-05", "window": { "start": { "local": "1981-04-05T11:33:59+02:00", "utc": "1981-04-05T09:33:59Z", "ms": 355311238926.68854 }, "end": { "local": "1981-04-05T12:21:59+02:00", "utc": "1981-04-05T10:21:59Z", "ms": 355314118926.68854 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 22:19 on Sat 4 Apr to 18:36 on Sun 5 Apr.", "fact": "1981-04-04T20:19:26Z → 1981-04-05T16:36:01Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:34–12:22 on the 4th, 11:34–12:22 on the 5th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during madhyāhna. It covers 0 of 48 minutes on the 4th and 48 of 48 on the 5th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 22442 s" }, { "step": "ruling", "text": "Navarātrārambha (Caitra), Cairo, 1981: Sunday 5 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "navaratra-arambha-caitra", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 1 Navaratrarambha (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-05", "confidence": "determinate" } ], "quote": "In Cairo, Navarātrārambha (Caitra) (Chaitra Navratri) 1981 falls on Sunday 5 April. Pratipadā runs from 22:19 on Sat 4 Apr to 18:36 on Sun 5 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/navaratra-arambha-caitra", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/gauri-tritiya", "festival": "gauri-tritiya", "name": "Gaurī Tṛtīyā", "everyday": "Gangaur", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 990, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-04-06T14:51:30+02:00", "utc": "1981-04-06T12:51:30Z", "ms": 355409490112.8974 }, "end": { "local": "1981-04-07T11:16:54+02:00", "utc": "1981-04-07T09:16:54Z", "ms": 355483014351.7101 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-06T14:51:30+02:00", "utc": "1981-04-06T12:51:30Z", "ms": 355409490112.8974 }, "end": { "local": "1981-04-07T11:16:54+02:00", "utc": "1981-04-07T09:16:54Z", "ms": 355483014351.7101 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-06", "window": { "start": { "local": "1981-04-06T11:33:42+02:00", "utc": "1981-04-06T09:33:42Z", "ms": 355397621784.9137 }, "end": { "local": "1981-04-06T12:21:42+02:00", "utc": "1981-04-06T10:21:42Z", "ms": 355400501784.9137 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-04-07", "window": { "start": { "local": "1981-04-07T11:33:25+02:00", "utc": "1981-04-07T09:33:25Z", "ms": 355484004834.8987 }, "end": { "local": "1981-04-07T12:21:25+02:00", "utc": "1981-04-07T10:21:25Z", "ms": 355486884834.8987 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "second-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 14:52 on Mon 6 Apr to 11:17 on Tue 7 Apr.", "fact": "1981-04-06T12:51:30Z → 1981-04-07T09:16:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:34–12:22 on the 6th, 11:33–12:21 on the 7th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during madhyāhna. It covers 0 of 48 minutes on the 6th and 0 of 48 on the 7th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Neither midday qualifies. The rule takes the second day.", "fact": "priority: unstated → second-day · margin 990 s" }, { "step": "ruling", "text": "Gaurī Tṛtīyā, Cairo, 1981: Tuesday 7 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "gauri-tritiya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Dolotsava, Gauri trtiya, Andolana trtiya, Saubhagya sayana vrata (paraviddha), Sarhul (Bihar)." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-07", "confidence": "determinate" } ], "quote": "In Cairo, Gaurī Tṛtīyā (Gangaur) 1981 falls on Tuesday 7 April. Tṛtīyā runs from 14:52 on Mon 6 Apr to 11:17 on Tue 7 Apr, and reaches madhyāhna on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/gauri-tritiya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/saubhagya-shayana-vrata", "festival": "saubhagya-shayana-vrata", "name": "Saubhāgya Śayana Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 990, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-04-06T14:51:30+02:00", "utc": "1981-04-06T12:51:30Z", "ms": 355409490112.8974 }, "end": { "local": "1981-04-07T11:16:54+02:00", "utc": "1981-04-07T09:16:54Z", "ms": 355483014351.7101 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-06T14:51:30+02:00", "utc": "1981-04-06T12:51:30Z", "ms": 355409490112.8974 }, "end": { "local": "1981-04-07T11:16:54+02:00", "utc": "1981-04-07T09:16:54Z", "ms": 355483014351.7101 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-06", "window": { "start": { "local": "1981-04-06T11:33:42+02:00", "utc": "1981-04-06T09:33:42Z", "ms": 355397621784.9137 }, "end": { "local": "1981-04-06T12:21:42+02:00", "utc": "1981-04-06T10:21:42Z", "ms": 355400501784.9137 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-04-07", "window": { "start": { "local": "1981-04-07T11:33:25+02:00", "utc": "1981-04-07T09:33:25Z", "ms": 355484004834.8987 }, "end": { "local": "1981-04-07T12:21:25+02:00", "utc": "1981-04-07T10:21:25Z", "ms": 355486884834.8987 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "second-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 14:52 on Mon 6 Apr to 11:17 on Tue 7 Apr.", "fact": "1981-04-06T12:51:30Z → 1981-04-07T09:16:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:34–12:22 on the 6th, 11:33–12:21 on the 7th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during madhyāhna. It covers 0 of 48 minutes on the 6th and 0 of 48 on the 7th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Neither midday qualifies. The rule takes the second day.", "fact": "priority: paraviddha → second-day · margin 990 s" }, { "step": "ruling", "text": "Saubhāgya Śayana Vrata, Cairo, 1981: Tuesday 7 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "saubhagya-shayana-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Dolotsava, Gauri trtiya, Andolana trtiya, Saubhagya sayana vrata (paraviddha), Sarhul (Bihar)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-07", "confidence": "determinate" } ], "quote": "In Cairo, Saubhāgya Śayana Vrata 1981 falls on Tuesday 7 April. Tṛtīyā runs from 14:52 on Mon 6 Apr to 11:17 on Tue 7 Apr, and reaches madhyāhna on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/saubhagya-shayana-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-04-07", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 990, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-04-07T11:16:54+02:00", "utc": "1981-04-07T09:16:54Z", "ms": 355483014351.7101 }, "end": { "local": "1981-04-08T08:02:27+02:00", "utc": "1981-04-08T06:02:27Z", "ms": 355557747224.876 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-07T11:16:54+02:00", "utc": "1981-04-07T09:16:54Z", "ms": 355483014351.7101 }, "end": { "local": "1981-04-08T08:02:27+02:00", "utc": "1981-04-08T06:02:27Z", "ms": 355557747224.876 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-07", "window": { "start": { "local": "1981-04-07T11:33:25+02:00", "utc": "1981-04-07T09:33:25Z", "ms": 355484004834.8987 }, "end": { "local": "1981-04-07T12:21:25+02:00", "utc": "1981-04-07T10:21:25Z", "ms": 355486884834.8987 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-08", "window": { "start": { "local": "1981-04-08T11:33:08+02:00", "utc": "1981-04-08T09:33:08Z", "ms": 355570388090.0394 }, "end": { "local": "1981-04-08T12:21:08+02:00", "utc": "1981-04-08T10:21:08Z", "ms": 355573268090.0394 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 11:17 on Tue 7 Apr to 08:02 on Wed 8 Apr.", "fact": "1981-04-07T09:16:54Z → 1981-04-08T06:02:27Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:33–12:21 on the 7th, 11:33–12:21 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 7th and 0 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 990 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Tuesday 7 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-07", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Tuesday 7 April. Caturthī runs from 11:17 on Tue 7 Apr to 08:02 on Wed 8 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-04-07", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/lakshmi-panchami", "festival": "lakshmi-panchami", "name": "Lakṣmī Pañcamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12641, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-04-08T08:02:27+02:00", "utc": "1981-04-08T06:02:27Z", "ms": 355557747224.876 }, "end": { "local": "1981-04-09T05:17:04+02:00", "utc": "1981-04-09T03:17:04Z", "ms": 355634223802.0378 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-08T08:02:27+02:00", "utc": "1981-04-08T06:02:27Z", "ms": 355557747224.876 }, "end": { "local": "1981-04-09T05:17:04+02:00", "utc": "1981-04-09T03:17:04Z", "ms": 355634223802.0378 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-08", "window": { "start": { "local": "1981-04-08T11:33:08+02:00", "utc": "1981-04-08T09:33:08Z", "ms": 355570388090.0394 }, "end": { "local": "1981-04-08T12:21:08+02:00", "utc": "1981-04-08T10:21:08Z", "ms": 355573268090.0394 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-09", "window": { "start": { "local": "1981-04-09T11:32:52+02:00", "utc": "1981-04-09T09:32:52Z", "ms": 355656771564.53217 }, "end": { "local": "1981-04-09T12:20:52+02:00", "utc": "1981-04-09T10:20:52Z", "ms": 355659651564.53217 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 08:02 on Wed 8 Apr to 05:17 on Thu 9 Apr.", "fact": "1981-04-08T06:02:27Z → 1981-04-09T03:17:04Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:33–12:21 on the 8th, 11:33–12:21 on the 9th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 48 of 48 minutes on the 8th and 0 of 48 on the 9th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 12641 s" }, { "step": "ruling", "text": "Lakṣmī Pañcamī, Cairo, 1981: Wednesday 8 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "lakshmi-panchami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Sri pancami or Laksmi pancami (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-08", "confidence": "determinate" } ], "quote": "In Cairo, Lakṣmī Pañcamī 1981 falls on Wednesday 8 April. Pañcamī runs from 08:02 on Wed 8 Apr to 05:17 on Thu 9 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/lakshmi-panchami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/bhavani-utpatti", "festival": "bhavani-utpatti", "name": "Bhavānī Utpatti", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35597, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-04-11T01:39:03+02:00", "utc": "1981-04-10T23:39:03Z", "ms": 355793942644.5259 }, "end": { "local": "1981-04-12T00:52:37+02:00", "utc": "1981-04-11T22:52:37Z", "ms": 355877557146.43115 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-11T01:39:03+02:00", "utc": "1981-04-10T23:39:03Z", "ms": 355793942644.5259 }, "end": { "local": "1981-04-12T00:52:37+02:00", "utc": "1981-04-11T22:52:37Z", "ms": 355877557146.43115 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-11", "window": { "start": { "local": "1981-04-11T11:32:19+02:00", "utc": "1981-04-11T09:32:19Z", "ms": 355829539233.251 }, "end": { "local": "1981-04-11T12:20:19+02:00", "utc": "1981-04-11T10:20:19Z", "ms": 355832419233.251 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-12", "window": { "start": { "local": "1981-04-12T11:32:03+02:00", "utc": "1981-04-12T09:32:03Z", "ms": 355915923460.5344 }, "end": { "local": "1981-04-12T12:20:03+02:00", "utc": "1981-04-12T10:20:03Z", "ms": 355918803460.5344 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 01:39 on Sat 11 Apr to 00:53 on Sun 12 Apr.", "fact": "1981-04-10T23:39:03Z → 1981-04-11T22:52:37Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:32–12:20 on the 11th, 11:32–12:20 on the 12th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 11th and 0 of 48 on the 12th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 35597 s" }, { "step": "ruling", "text": "Bhavānī Utpatti, Cairo, 1981: Saturday 11 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "bhavani-utpatti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 8 Annapurna puja (Beng.) (paraviddha), Bhavani-utpatti (paraviddha), Asokastami (Special when combined with naks. Punarvasu and Wednesday, after mid-day)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-11", "confidence": "determinate" } ], "quote": "In Cairo, Bhavānī Utpatti 1981 falls on Saturday 11 April. Aṣṭamī runs from 01:39 on Sat 11 Apr to 00:53 on Sun 12 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/bhavani-utpatti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rama-navami", "festival": "rama-navami", "name": "Rāma Navamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 38366, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "1981-04-12T00:52:37+02:00", "utc": "1981-04-11T22:52:37Z", "ms": 355877557146.43115 }, "end": { "local": "1981-04-13T00:47:12+02:00", "utc": "1981-04-12T22:47:12Z", "ms": 355963632028.60504 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-12T00:52:37+02:00", "utc": "1981-04-11T22:52:37Z", "ms": 355877557146.43115 }, "end": { "local": "1981-04-13T00:47:12+02:00", "utc": "1981-04-12T22:47:12Z", "ms": 355963632028.60504 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-12", "window": { "start": { "local": "1981-04-12T11:32:03+02:00", "utc": "1981-04-12T09:32:03Z", "ms": 355915923460.5344 }, "end": { "local": "1981-04-12T12:20:03+02:00", "utc": "1981-04-12T10:20:03Z", "ms": 355918803460.5344 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-13", "window": { "start": { "local": "1981-04-13T11:31:48+02:00", "utc": "1981-04-13T09:31:48Z", "ms": 356002307972.8887 }, "end": { "local": "1981-04-13T12:19:48+02:00", "utc": "1981-04-13T10:19:48Z", "ms": 356005187972.8887 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Navamī runs from 00:53 on Sun 12 Apr to 00:47 on Mon 13 Apr.", "fact": "1981-04-11T22:52:37Z → 1981-04-12T22:47:12Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:32–12:20 on the 12th, 11:32–12:20 on the 13th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Navamī must be present during madhyāhna. It covers 48 of 48 minutes on the 12th and 0 of 48 on the 13th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 38366 s" }, { "step": "ruling", "text": "Rāma Navamī, Cairo, 1981: Sunday 12 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rama-navami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 9 Ramanavami (madhyahnavyapini, special with Punarvasu naks.), Rama jayanti." } ], "not_evaluated": "The row calls the day special when it falls with Punarvasu nakṣatra; the nakṣatra is not tested.", "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-12", "confidence": "determinate" } ], "quote": "In Cairo, Rāma Navamī 1981 falls on Sunday 12 April. Navamī runs from 00:53 on Sun 12 Apr to 00:47 on Mon 13 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rama-navami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vaishakhi", "festival": "vaishakhi", "name": "Vaiśākhī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 41294, "anga": { "type": "sankranti", "index": 0, "key": "mesha", "name": "Meṣa", "start": { "local": "1981-04-13T16:59:11+02:00", "utc": "1981-04-13T14:59:11Z", "ms": 356021951172.8104 }, "end": { "local": "1981-05-14T14:56:40+03:00", "utc": "1981-05-14T11:56:40Z", "ms": 358689399806.40643 } }, "span": { "of": "transit", "start": { "local": "1981-04-13T16:59:11+02:00", "utc": "1981-04-13T14:59:11Z", "ms": 356021951172.8104 }, "end": { "local": "1981-04-13T16:59:11+02:00", "utc": "1981-04-13T14:59:11Z", "ms": 356021951172.8104 } }, "kaala": "day", "days": [ { "local_date": "1981-04-12", "window": { "start": { "local": "1981-04-12T05:32:05+02:00", "utc": "1981-04-12T03:32:05Z", "ms": 355894325013.47504 }, "end": { "local": "1981-04-13T05:30:57+02:00", "utc": "1981-04-13T03:30:57Z", "ms": 355980657208.50635 } }, "covered_min": 0, "window_min": 1439, "qualifies": false }, { "local_date": "1981-04-13", "window": { "start": { "local": "1981-04-13T05:30:57+02:00", "utc": "1981-04-13T03:30:57Z", "ms": 355980657208.50635 }, "end": { "local": "1981-04-14T05:29:50+02:00", "utc": "1981-04-14T03:29:50Z", "ms": 356066989931.9518 } }, "covered_min": 1, "window_min": 1439, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Meṣa at 16:59 on Mon 13 Apr.", "fact": "1981-04-13T14:59:11Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day runs from sunrise to the next sunrise: from 05:32 on the 12th, and from 05:31 on the 13th.", "fact": "day: sunrise-to-sunrise · sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "The festival is kept on the day of the transit, the day counted from sunrise. The transit falls on the 13th, not the 12th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106" }, { "step": "tie_break", "text": "An instant falls in one day and no other. No tie-break is needed.", "fact": "day counted from sunrise → only-day · margin 41294 s" }, { "step": "ruling", "text": "Vaiśākhī, Cairo, 1981: Monday 13 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "solar", "id": "vaishakhi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Mesadi — Cadaka puja (Bengal), Bahag Bihu (Assam), Cheiraoba (Manipur), Visu (T. C. State), Vaisakhi (on the samkramana day commencing from sunrise)." }, { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day." } ], "not_evaluated": "The other names in the row (Cadaka puja, Bahag Bihu, Cheiraoba, Visu) are regional observances and wait with the regional rows.", "rashi": "Meṣa", "day_from": "sunrise" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-13", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "1981-04-13", "statement": "Counted from midnight", "reference": { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 106", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day." } }, { "kind": "reckoning", "id": "sunset-rule", "local_date": "1981-04-13", "statement": "Past sunset, the next day (the Tamil rule)", "reference": { "text": "Calendar Reform Committee 1955, Rules of Samkranti", "locator": "p. 244", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The Tamil rule: In the Tamil districts the rule is that when a samkranti takes place before sunset, the month begins on the same day, while if it takes place after sunset the month begins on the following day." } } ], "quote": "In Cairo, Vaiśākhī 1981 falls on Monday 13 April. The Sun enters Meṣa at 16:59 on Mon 13 Apr, and the rule counts the day from sunrise.", "cite": "https://ahargana.org/cairo/festivals/1981/vaishakhi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-04-14", "festival": "ekadashi", "name": "Kāmadā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11175, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-04-14T01:18:59+02:00", "utc": "1981-04-13T23:18:59Z", "ms": 356051939030.2655 }, "end": { "local": "1981-04-15T02:22:28+02:00", "utc": "1981-04-15T00:22:28Z", "ms": 356142148387.1143 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-14T01:18:59+02:00", "utc": "1981-04-13T23:18:59Z", "ms": 356051939030.2655 }, "end": { "local": "1981-04-15T02:22:28+02:00", "utc": "1981-04-15T00:22:28Z", "ms": 356142148387.1143 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-04-14", "window": { "start": { "local": "1981-04-14T05:29:50+02:00", "utc": "1981-04-14T03:29:50Z", "ms": 356066989931.9518 }, "end": { "local": "1981-04-14T05:29:50+02:00", "utc": "1981-04-14T03:29:50Z", "ms": 356066989931.9518 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-04-15", "window": { "start": { "local": "1981-04-15T05:28:43+02:00", "utc": "1981-04-15T03:28:43Z", "ms": 356153323212.4289 }, "end": { "local": "1981-04-15T05:28:43+02:00", "utc": "1981-04-15T03:28:43Z", "ms": 356153323212.4289 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 01:19 on Tue 14 Apr to 02:22 on Wed 15 Apr.", "fact": "1981-04-13T23:18:59Z → 1981-04-15T00:22:28Z" }, { "step": "kaala", "text": "Sunrise is at 05:30 on the 14th and 05:29 on the 15th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 14th and is not on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 11175 s" }, { "step": "ruling", "text": "Kāmadā Ekādaśī, Cairo, 1981: Tuesday 14 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-14", "confidence": "determinate" } ], "quote": "In Cairo, Kāmadā Ekādaśī 1981 falls on Tuesday 14 April. Ekādaśī runs from 01:19 on Tue 14 Apr to 02:22 on Wed 15 Apr and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-04-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ananga-trayodashi", "festival": "ananga-trayodashi", "name": "Anaṅga Trayodaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 21024, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-04-16T03:51:33+02:00", "utc": "1981-04-16T01:51:33Z", "ms": 356233892714.3723 }, "end": { "local": "1981-04-17T05:40:25+02:00", "utc": "1981-04-17T03:40:25Z", "ms": 356326824734.34015 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-16T03:51:33+02:00", "utc": "1981-04-16T01:51:33Z", "ms": 356233892714.3723 }, "end": { "local": "1981-04-17T05:40:25+02:00", "utc": "1981-04-17T03:40:25Z", "ms": 356326824734.34015 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-16", "window": { "start": { "local": "1981-04-16T11:31:03+02:00", "utc": "1981-04-16T09:31:03Z", "ms": 356261463399.20996 }, "end": { "local": "1981-04-16T12:19:03+02:00", "utc": "1981-04-16T10:19:03Z", "ms": 356264343399.20996 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-17", "window": { "start": { "local": "1981-04-17T11:30:49+02:00", "utc": "1981-04-17T09:30:49Z", "ms": 356347849230.858 }, "end": { "local": "1981-04-17T12:18:49+02:00", "utc": "1981-04-17T10:18:49Z", "ms": 356350729230.858 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 03:52 on Thu 16 Apr to 05:40 on Fri 17 Apr.", "fact": "1981-04-16T01:51:33Z → 1981-04-17T03:40:25Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:31–12:19 on the 16th, 11:31–12:19 on the 17th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 16th and 0 of 48 on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 21024 s" }, { "step": "ruling", "text": "Anaṅga Trayodaśī, Cairo, 1981: Thursday 16 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ananga-trayodashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 13 Ananga trayodasi (purvaviddha), Mahavira jayanti (Jain)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-16", "confidence": "determinate" } ], "quote": "In Cairo, Anaṅga Trayodaśī 1981 falls on Thursday 16 April. Trayodaśī runs from 03:52 on Thu 16 Apr to 05:40 on Fri 17 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/ananga-trayodashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-04-16", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28854, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-04-16T03:51:33+02:00", "utc": "1981-04-16T01:51:33Z", "ms": 356233892714.3723 }, "end": { "local": "1981-04-17T05:40:25+02:00", "utc": "1981-04-17T03:40:25Z", "ms": 356326824734.34015 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-16T03:51:33+02:00", "utc": "1981-04-16T01:51:33Z", "ms": 356233892714.3723 }, "end": { "local": "1981-04-17T05:40:25+02:00", "utc": "1981-04-17T03:40:25Z", "ms": 356326824734.34015 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-04-15", "window": { "start": { "local": "1981-04-15T18:21:53+02:00", "utc": "1981-04-15T16:21:53Z", "ms": 356199712636.0708 }, "end": { "local": "1981-04-15T19:50:39+02:00", "utc": "1981-04-15T17:50:39Z", "ms": 356205038561.74884 } }, "covered_min": 0, "window_min": 89, "qualifies": false }, { "local_date": "1981-04-16", "window": { "start": { "local": "1981-04-16T18:22:30+02:00", "utc": "1981-04-16T16:22:30Z", "ms": 356286149719.76404 }, "end": { "local": "1981-04-16T19:51:02+02:00", "utc": "1981-04-16T17:51:02Z", "ms": 356291461965.04395 } }, "covered_min": 89, "window_min": 89, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 03:52 on Thu 16 Apr to 05:40 on Fri 17 Apr.", "fact": "1981-04-16T01:51:33Z → 1981-04-17T03:40:25Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:22–19:51 on the 15th, 18:22–19:51 on the 16th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 89 minutes on the 15th and 89 of 89 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 28854 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Thursday 16 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-16", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Thursday 16 April. Trayodaśī runs from 03:52 on Thu 16 Apr to 05:40 on Fri 17 Apr and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-04-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vishnu-damanaka-chaturdashi", "festival": "vishnu-damanaka-chaturdashi", "name": "Viṣṇudamanaka Caturdaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13584, "anga": { "type": "tithi", "index": 13, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-04-17T05:40:25+02:00", "utc": "1981-04-17T03:40:25Z", "ms": 356326824734.34015 }, "end": { "local": "1981-04-18T07:44:11+02:00", "utc": "1981-04-18T05:44:11Z", "ms": 356420651273.18164 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-17T05:40:25+02:00", "utc": "1981-04-17T03:40:25Z", "ms": 356326824734.34015 }, "end": { "local": "1981-04-18T07:44:11+02:00", "utc": "1981-04-18T05:44:11Z", "ms": 356420651273.18164 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-17", "window": { "start": { "local": "1981-04-17T11:30:49+02:00", "utc": "1981-04-17T09:30:49Z", "ms": 356347849230.858 }, "end": { "local": "1981-04-17T12:18:49+02:00", "utc": "1981-04-17T10:18:49Z", "ms": 356350729230.858 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-18", "window": { "start": { "local": "1981-04-18T11:30:35+02:00", "utc": "1981-04-18T09:30:35Z", "ms": 356434235436.7848 }, "end": { "local": "1981-04-18T12:18:35+02:00", "utc": "1981-04-18T10:18:35Z", "ms": 356437115436.7848 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 05:40 on Fri 17 Apr to 07:44 on Sat 18 Apr.", "fact": "1981-04-17T03:40:25Z → 1981-04-18T05:44:11Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:31–12:19 on the 17th, 11:31–12:19 on the 18th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 17th and 0 of 48 on the 18th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 13584 s" }, { "step": "ruling", "text": "Viṣṇudamanaka Caturdaśī, Cairo, 1981: Friday 17 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vishnu-damanaka-chaturdashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 14 Madanabhanji, (Bengal & Orissa) (paraviddha), Sivadamanaka caturdasi, Visnudamanaka caturdasi (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-17", "confidence": "determinate" } ], "quote": "In Cairo, Viṣṇudamanaka Caturdaśī 1981 falls on Friday 17 April. Caturdaśī runs from 05:40 on Fri 17 Apr to 07:44 on Sat 18 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vishnu-damanaka-chaturdashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/chaitri-purnima", "festival": "chaitri-purnima", "name": "Caitrī Pūrṇimā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5487, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-04-18T07:44:11+02:00", "utc": "1981-04-18T05:44:11Z", "ms": 356420651273.18164 }, "end": { "local": "1981-04-19T09:58:55+02:00", "utc": "1981-04-19T07:58:55Z", "ms": 356515135072.7287 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "1981-04-18T07:44:11+02:00", "utc": "1981-04-18T05:44:11Z", "ms": 356420651273.18164 }, "end": { "local": "1981-04-19T09:58:55+02:00", "utc": "1981-04-19T07:58:55Z", "ms": 356515135072.7287 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-04-18", "window": { "start": { "local": "1981-04-18T11:30:35+02:00", "utc": "1981-04-18T09:30:35Z", "ms": 356434235436.7848 }, "end": { "local": "1981-04-18T12:18:35+02:00", "utc": "1981-04-18T10:18:35Z", "ms": 356437115436.7848 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-04-19", "window": { "start": { "local": "1981-04-19T11:30:22+02:00", "utc": "1981-04-19T09:30:22Z", "ms": 356520622034.2274 }, "end": { "local": "1981-04-19T12:18:22+02:00", "utc": "1981-04-19T10:18:22Z", "ms": 356523502034.2274 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 07:44 on Sat 18 Apr to 09:59 on Sun 19 Apr.", "fact": "1981-04-18T05:44:11Z → 1981-04-19T07:58:55Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:31–12:19 on the 18th, 11:30–12:18 on the 19th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 18th and 0 of 48 on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 5487 s" }, { "step": "ruling", "text": "Caitrī Pūrṇimā, Cairo, 1981: Saturday 18 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "chaitri-purnima", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Caitri purnima (paraviddha), Hanumat jayanti, Oli ending (Jain)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-18", "confidence": "determinate" } ], "quote": "In Cairo, Caitrī Pūrṇimā 1981 falls on Saturday 18 April. Pūrṇimā runs from 07:44 on Sat 18 Apr to 09:59 on Sun 19 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/chaitri-purnima", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-04-22", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9552, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-04-22T17:11:32+02:00", "utc": "1981-04-22T15:11:32Z", "ms": 356800292237.0658 }, "end": { "local": "1981-04-23T19:28:08+02:00", "utc": "1981-04-23T17:28:08Z", "ms": 356894887726.6423 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-04-22T17:11:32+02:00", "utc": "1981-04-22T15:11:32Z", "ms": 356800292237.0658 }, "end": { "local": "1981-04-23T19:28:08+02:00", "utc": "1981-04-23T17:28:08Z", "ms": 356894887726.6423 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-04-22", "window": { "start": { "local": "1981-04-22T21:14:40+02:00", "utc": "1981-04-22T19:14:40Z", "ms": 356814880058.8023 }, "end": { "local": "1981-04-22T21:14:40+02:00", "utc": "1981-04-22T19:14:40Z", "ms": 356814880058.8023 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-04-23", "window": { "start": { "local": "1981-04-23T22:07:20+02:00", "utc": "1981-04-23T20:07:20Z", "ms": 356904440129.83167 }, "end": { "local": "1981-04-23T22:07:20+02:00", "utc": "1981-04-23T20:07:20Z", "ms": 356904440129.83167 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 17:12 on Wed 22 Apr to 19:28 on Thu 23 Apr.", "fact": "1981-04-22T15:11:32Z → 1981-04-23T17:28:08Z" }, { "step": "kaala", "text": "Moonrise is at 21:15 on the 22nd and 22:07 on the 23rd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 22nd and is not on the 23rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 9552 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Wednesday 22 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-22", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Wednesday 22 April. Caturthī runs from 17:12 on Wed 22 Apr to 19:28 on Thu 23 Apr and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-04-22", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-04-30", "festival": "ekadashi", "name": "Varūthinī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-04-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24741, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-04-29T22:21:07+02:00", "utc": "1981-04-29T20:21:07Z", "ms": 357423667048.8556 }, "end": { "local": "1981-04-30T20:12:06+02:00", "utc": "1981-04-30T18:12:06Z", "ms": 357502326242.0843 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-04-29T22:21:07+02:00", "utc": "1981-04-29T20:21:07Z", "ms": 357423667048.8556 }, "end": { "local": "1981-04-30T20:12:06+02:00", "utc": "1981-04-30T18:12:06Z", "ms": 357502326242.0843 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-04-30", "window": { "start": { "local": "1981-04-30T05:13:29+02:00", "utc": "1981-04-30T03:13:29Z", "ms": 357448408501.64703 }, "end": { "local": "1981-04-30T05:13:29+02:00", "utc": "1981-04-30T03:13:29Z", "ms": 357448408501.64703 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-05-01", "window": { "start": { "local": "1981-05-01T06:12:34+03:00", "utc": "1981-05-01T03:12:34Z", "ms": 357534754486.3559 }, "end": { "local": "1981-05-01T06:12:34+03:00", "utc": "1981-05-01T03:12:34Z", "ms": 357534754486.3559 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 22:21 on Wed 29 Apr to 20:12 on Thu 30 Apr.", "fact": "1981-04-29T20:21:07Z → 1981-04-30T18:12:06Z" }, { "step": "kaala", "text": "Sunrise is at 05:13 on the 30th and 06:13 on the 1st.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 30th and is not on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 24741 s" }, { "step": "ruling", "text": "Varūthinī Ekādaśī, Cairo, 1981: Thursday 30 April.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-04-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-04-30", "confidence": "determinate" } ], "quote": "In Cairo, Varūthinī Ekādaśī 1981 falls on Thursday 30 April. Ekādaśī runs from 22:21 on Wed 29 Apr to 20:12 on Thu 30 Apr and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-04-30", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-05-01", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4187, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-05-01T18:22:13+03:00", "utc": "1981-05-01T15:22:13Z", "ms": 357578533320.6456 }, "end": { "local": "1981-05-02T14:59:52+03:00", "utc": "1981-05-02T11:59:52Z", "ms": 357652791784.8772 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-01T18:22:13+03:00", "utc": "1981-05-01T15:22:13Z", "ms": 357578533320.6456 }, "end": { "local": "1981-05-02T14:59:52+03:00", "utc": "1981-05-02T11:59:52Z", "ms": 357652791784.8772 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-05-01", "window": { "start": { "local": "1981-05-01T19:32:00+03:00", "utc": "1981-05-01T16:32:00Z", "ms": 357582719870.12317 }, "end": { "local": "1981-05-01T20:57:17+03:00", "utc": "1981-05-01T17:57:17Z", "ms": 357587837418.21295 } }, "covered_min": 85, "window_min": 85, "qualifies": true }, { "local_date": "1981-05-02", "window": { "start": { "local": "1981-05-02T19:32:39+03:00", "utc": "1981-05-02T16:32:39Z", "ms": 357669158767.8321 }, "end": { "local": "1981-05-02T20:57:44+03:00", "utc": "1981-05-02T17:57:44Z", "ms": 357674264199.4622 } }, "covered_min": 0, "window_min": 85, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 18:22 on Fri 1 May to 15:00 on Sat 2 May.", "fact": "1981-05-01T15:22:13Z → 1981-05-02T11:59:52Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:32–20:57 on the 1st, 19:33–20:58 on the 2nd.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 85 of 85 minutes on the 1st and 0 of 85 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 4187 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Friday 1 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-01", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Friday 1 May. Trayodaśī runs from 18:22 on Fri 1 May to 15:00 on Sat 2 May and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-05-01", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-05-02", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34072, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-05-02T14:59:52+03:00", "utc": "1981-05-02T11:59:52Z", "ms": 357652791784.8772 }, "end": { "local": "1981-05-03T11:15:08+03:00", "utc": "1981-05-03T08:15:08Z", "ms": 357725708258.6358 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-02T14:59:52+03:00", "utc": "1981-05-02T11:59:52Z", "ms": 357652791784.8772 }, "end": { "local": "1981-05-03T11:15:08+03:00", "utc": "1981-05-03T08:15:08Z", "ms": 357725708258.6358 } }, "kaala": "nishita", "days": [ { "local_date": "1981-05-02", "window": { "start": { "local": "1981-05-03T00:27:44+03:00", "utc": "1981-05-02T21:27:44Z", "ms": 357686864136.44507 }, "end": { "local": "1981-05-03T01:15:44+03:00", "utc": "1981-05-02T22:15:44Z", "ms": 357689744136.44507 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-05-03", "window": { "start": { "local": "1981-05-04T00:27:38+03:00", "utc": "1981-05-03T21:27:38Z", "ms": 357773258154.67834 }, "end": { "local": "1981-05-04T01:15:38+03:00", "utc": "1981-05-03T22:15:38Z", "ms": 357776138154.67834 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 15:00 on Sat 2 May to 11:15 on Sun 3 May.", "fact": "1981-05-02T11:59:52Z → 1981-05-03T08:15:08Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:28–01:16 on the 2nd, 00:28–01:16 on the 3rd.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 2nd and 0 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 34072 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Saturday 2 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-02", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Saturday 2 May. Caturdaśī runs from 15:00 on Sat 2 May to 11:15 on Sun 3 May and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-05-02", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/akshaya-tritiya", "festival": "akshaya-tritiya", "name": "Akṣaya Tṛtīyā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23324, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-05-05T23:39:36+03:00", "utc": "1981-05-05T20:39:36Z", "ms": 357943176116.2125 }, "end": { "local": "1981-05-06T20:18:19+03:00", "utc": "1981-05-06T17:18:19Z", "ms": 358017499447.8388 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-05T23:39:36+03:00", "utc": "1981-05-05T20:39:36Z", "ms": 357943176116.2125 }, "end": { "local": "1981-05-06T20:18:19+03:00", "utc": "1981-05-06T17:18:19Z", "ms": 358017499447.8388 } }, "kaala": "purvahna", "days": [ { "local_date": "1981-05-06", "window": { "start": { "local": "1981-05-06T06:08:20+03:00", "utc": "1981-05-06T03:08:20Z", "ms": 357966499936.74493 }, "end": { "local": "1981-05-06T10:37:18+03:00", "utc": "1981-05-06T07:37:18Z", "ms": 357982638240.1279 } }, "covered_min": 269, "window_min": 269, "qualifies": true }, { "local_date": "1981-05-07", "window": { "start": { "local": "1981-05-07T06:07:32+03:00", "utc": "1981-05-07T03:07:32Z", "ms": 358052852257.8802 }, "end": { "local": "1981-05-07T10:36:59+03:00", "utc": "1981-05-07T07:36:59Z", "ms": 358069019470.6022 } }, "covered_min": 0, "window_min": 269, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 23:40 on Tue 5 May to 20:18 on Wed 6 May.", "fact": "1981-05-05T20:39:36Z → 1981-05-06T17:18:19Z" }, { "step": "kaala", "text": "Pūrvāhṇa is first 5 of 15 day muhūrtas: 06:08–10:37 on the 6th, 06:08–10:37 on the 7th.", "fact": "purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during pūrvāhṇa. It covers 269 of 269 minutes on the 6th and 0 of 269 on the 7th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one forenoon qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 23324 s" }, { "step": "ruling", "text": "Akṣaya Tṛtīyā, Cairo, 1981: Wednesday 6 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "akshaya-tritiya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Aksaya trtiya (purvahna vyapini, paraviddha) (Special when combined with Rohini naksatra and Wednesday), Candanayatra, Parasurama jayanti (pradosavyapini — if occurs on two successive days, the second day is to be observed)." } ], "not_evaluated": "The row calls the day special with Rohiṇī nakṣatra and a Wednesday; neither is tested.", "kaala": "purvahna", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-06", "confidence": "determinate" } ], "quote": "In Cairo, Akṣaya Tṛtīyā 1981 falls on Wednesday 6 May. Tṛtīyā runs from 23:40 on Tue 5 May to 20:18 on Wed 6 May and covers all of pūrvāhṇa that forenoon.", "cite": "https://ahargana.org/cairo/festivals/1981/akshaya-tritiya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/parashurama-jayanti", "festival": "parashurama-jayanti", "name": "Paraśurāma Jayantī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2474, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-05-05T23:39:36+03:00", "utc": "1981-05-05T20:39:36Z", "ms": 357943176116.2125 }, "end": { "local": "1981-05-06T20:18:19+03:00", "utc": "1981-05-06T17:18:19Z", "ms": 358017499447.8388 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-05T23:39:36+03:00", "utc": "1981-05-05T20:39:36Z", "ms": 357943176116.2125 }, "end": { "local": "1981-05-06T20:18:19+03:00", "utc": "1981-05-06T17:18:19Z", "ms": 358017499447.8388 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-05-05", "window": { "start": { "local": "1981-05-05T19:34:36+03:00", "utc": "1981-05-05T16:34:36Z", "ms": 357928475790.1123 }, "end": { "local": "1981-05-05T20:59:06+03:00", "utc": "1981-05-05T17:59:06Z", "ms": 357933545676.33 } }, "covered_min": 0, "window_min": 84, "qualifies": false }, { "local_date": "1981-05-06", "window": { "start": { "local": "1981-05-06T19:35:15+03:00", "utc": "1981-05-06T16:35:15Z", "ms": 358014914846.8939 }, "end": { "local": "1981-05-06T20:59:33+03:00", "utc": "1981-05-06T17:59:33Z", "ms": 358019973168.35876 } }, "covered_min": 43, "window_min": 84, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 23:40 on Tue 5 May to 20:18 on Wed 6 May.", "fact": "1981-05-05T20:39:36Z → 1981-05-06T17:18:19Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:35–20:59 on the 5th, 19:35–21:00 on the 6th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during pradoṣa. It covers 0 of 84 minutes on the 5th and 43 of 84 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 2474 s" }, { "step": "ruling", "text": "Paraśurāma Jayantī, Cairo, 1981: Wednesday 6 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "parashurama-jayanti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Aksaya trtiya (purvahna vyapini, paraviddha) (Special when combined with Rohini naksatra and Wednesday), Candanayatra, Parasurama jayanti (pradosavyapini — if occurs on two successive days, the second day is to be observed)." } ], "kaala": "pradosha", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-06", "confidence": "determinate" } ], "quote": "In Cairo, Paraśurāma Jayantī 1981 falls on Wednesday 6 May. Tṛtīyā runs from 23:40 on Tue 5 May to 20:18 on Wed 6 May and covers 43 of 84 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/parashurama-jayanti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-05-07", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15219, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-05-06T20:18:19+03:00", "utc": "1981-05-06T17:18:19Z", "ms": 358017499447.8388 }, "end": { "local": "1981-05-07T17:29:22+03:00", "utc": "1981-05-07T14:29:22Z", "ms": 358093762151.16986 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-06T20:18:19+03:00", "utc": "1981-05-06T17:18:19Z", "ms": 358017499447.8388 }, "end": { "local": "1981-05-07T17:29:22+03:00", "utc": "1981-05-07T14:29:22Z", "ms": 358093762151.16986 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-06", "window": { "start": { "local": "1981-05-06T12:27:47+03:00", "utc": "1981-05-06T09:27:47Z", "ms": 357989267391.81946 }, "end": { "local": "1981-05-06T13:15:47+03:00", "utc": "1981-05-06T10:15:47Z", "ms": 357992147391.81946 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-05-07", "window": { "start": { "local": "1981-05-07T12:27:43+03:00", "utc": "1981-05-07T09:27:43Z", "ms": 358075663076.9632 }, "end": { "local": "1981-05-07T13:15:43+03:00", "utc": "1981-05-07T10:15:43Z", "ms": 358078543076.9632 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 20:18 on Wed 6 May to 17:29 on Thu 7 May.", "fact": "1981-05-06T17:18:19Z → 1981-05-07T14:29:22Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 6th, 12:28–13:16 on the 7th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 6th and 48 of 48 on the 7th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 15219 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Thursday 7 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-07", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Thursday 7 May. Caturthī runs from 20:18 on Wed 6 May to 17:29 on Thu 7 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-05-07", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shankara-jayanti", "festival": "shankara-jayanti", "name": "Śaṅkara Jayantī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7498, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-05-07T17:29:22+03:00", "utc": "1981-05-07T14:29:22Z", "ms": 358093762151.16986 }, "end": { "local": "1981-05-08T15:20:37+03:00", "utc": "1981-05-08T12:20:37Z", "ms": 358172436836.14996 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-07T17:29:22+03:00", "utc": "1981-05-07T14:29:22Z", "ms": 358093762151.16986 }, "end": { "local": "1981-05-08T15:20:37+03:00", "utc": "1981-05-08T12:20:37Z", "ms": 358172436836.14996 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-07", "window": { "start": { "local": "1981-05-07T12:27:43+03:00", "utc": "1981-05-07T09:27:43Z", "ms": 358075663076.9632 }, "end": { "local": "1981-05-07T13:15:43+03:00", "utc": "1981-05-07T10:15:43Z", "ms": 358078543076.9632 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-05-08", "window": { "start": { "local": "1981-05-08T12:27:39+03:00", "utc": "1981-05-08T09:27:39Z", "ms": 358162059307.6991 }, "end": { "local": "1981-05-08T13:15:39+03:00", "utc": "1981-05-08T10:15:39Z", "ms": 358164939307.6991 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 17:29 on Thu 7 May to 15:21 on Fri 8 May.", "fact": "1981-05-07T14:29:22Z → 1981-05-08T12:20:37Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 7th, 12:28–13:16 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 0 of 48 minutes on the 7th and 48 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 7498 s" }, { "step": "ruling", "text": "Śaṅkara Jayantī, Cairo, 1981: Friday 8 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shankara-jayanti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Sankara jayanti." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-08", "confidence": "determinate" } ], "quote": "In Cairo, Śaṅkara Jayantī 1981 falls on Friday 8 May. Pañcamī runs from 17:29 on Thu 7 May to 15:21 on Fri 8 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/shankara-jayanti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/gangotpatti", "festival": "gangotpatti", "name": "Gaṅgotpatti", "everyday": "Ganga Saptami", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 382, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-05-09T13:57:24+03:00", "utc": "1981-05-09T10:57:24Z", "ms": 358253844310.2676 }, "end": { "local": "1981-05-10T13:21:56+03:00", "utc": "1981-05-10T10:21:56Z", "ms": 358338115869.4165 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-09T13:57:24+03:00", "utc": "1981-05-09T10:57:24Z", "ms": 358253844310.2676 }, "end": { "local": "1981-05-10T13:21:56+03:00", "utc": "1981-05-10T10:21:56Z", "ms": 358338115869.4165 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-09", "window": { "start": { "local": "1981-05-09T12:27:36+03:00", "utc": "1981-05-09T09:27:36Z", "ms": 358248456084.00037 }, "end": { "local": "1981-05-09T13:15:36+03:00", "utc": "1981-05-09T10:15:36Z", "ms": 358251336084.00037 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-05-10", "window": { "start": { "local": "1981-05-10T12:27:33+03:00", "utc": "1981-05-10T09:27:33Z", "ms": 358334853406.4159 }, "end": { "local": "1981-05-10T13:15:33+03:00", "utc": "1981-05-10T10:15:33Z", "ms": 358337733406.4159 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 13:57 on Sat 9 May to 13:22 on Sun 10 May.", "fact": "1981-05-09T10:57:24Z → 1981-05-10T10:21:56Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 9th, 12:28–13:16 on the 10th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during madhyāhna. It covers 0 of 48 minutes on the 9th and 48 of 48 on the 10th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 382 s" }, { "step": "ruling", "text": "Gaṅgotpatti, Cairo, 1981: Sunday 10 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "gangotpatti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 7 Gangotpatti, (madhyahna vyapini, if occurs on two successive days, the first day is to be observed), Jahnu saptami, Sarkara saptami." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-09", "confidence": "determinate" } ], "quote": "In Cairo, Gaṅgotpatti (Ganga Saptami) 1981 falls on Sunday 10 May. Saptamī runs from 13:57 on Sat 9 May to 13:22 on Sun 10 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/gangotpatti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-05-14", "festival": "ekadashi", "name": "Mohinī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35385, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-05-13T15:52:56+03:00", "utc": "1981-05-13T12:52:56Z", "ms": 358606375683.9335 }, "end": { "local": "1981-05-14T17:46:14+03:00", "utc": "1981-05-14T14:46:14Z", "ms": 358699573655.84125 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-13T15:52:56+03:00", "utc": "1981-05-13T12:52:56Z", "ms": 358606375683.9335 }, "end": { "local": "1981-05-14T17:46:14+03:00", "utc": "1981-05-14T14:46:14Z", "ms": 358699573655.84125 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-05-13", "window": { "start": { "local": "1981-05-13T06:03:10+03:00", "utc": "1981-05-13T03:03:10Z", "ms": 358570990338.20544 }, "end": { "local": "1981-05-13T06:03:10+03:00", "utc": "1981-05-13T03:03:10Z", "ms": 358570990338.20544 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-05-14", "window": { "start": { "local": "1981-05-14T06:02:31+03:00", "utc": "1981-05-14T03:02:31Z", "ms": 358657350891.9839 }, "end": { "local": "1981-05-14T06:02:31+03:00", "utc": "1981-05-14T03:02:31Z", "ms": 358657350891.9839 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 15:53 on Wed 13 May to 17:46 on Thu 14 May.", "fact": "1981-05-13T12:52:56Z → 1981-05-14T14:46:14Z" }, { "step": "kaala", "text": "Sunrise is at 06:03 on the 13th and 06:03 on the 14th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 13th and is on the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 35385 s" }, { "step": "ruling", "text": "Mohinī Ekādaśī, Cairo, 1981: Thursday 14 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-14", "confidence": "determinate" } ], "quote": "In Cairo, Mohinī Ekādaśī 1981 falls on Thursday 14 May. Ekādaśī runs from 15:53 on Wed 13 May to 17:46 on Thu 14 May and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-05-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/parashurama-dvadashi", "festival": "parashurama-dvadashi", "name": "Paraśurāma Dvādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16245, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-05-14T17:46:14+03:00", "utc": "1981-05-14T14:46:14Z", "ms": 358699573655.84125 }, "end": { "local": "1981-05-15T19:56:54+03:00", "utc": "1981-05-15T16:56:54Z", "ms": 358793813614.6534 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-14T17:46:14+03:00", "utc": "1981-05-14T14:46:14Z", "ms": 358699573655.84125 }, "end": { "local": "1981-05-15T19:56:54+03:00", "utc": "1981-05-15T16:56:54Z", "ms": 358793813614.6534 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-14", "window": { "start": { "local": "1981-05-14T12:27:28+03:00", "utc": "1981-05-14T09:27:28Z", "ms": 358680448175.8198 }, "end": { "local": "1981-05-14T13:15:28+03:00", "utc": "1981-05-14T10:15:28Z", "ms": 358683328175.8198 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-05-15", "window": { "start": { "local": "1981-05-15T12:27:28+03:00", "utc": "1981-05-15T09:27:28Z", "ms": 358766848241.7322 }, "end": { "local": "1981-05-15T13:15:28+03:00", "utc": "1981-05-15T10:15:28Z", "ms": 358769728241.7322 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 17:46 on Thu 14 May to 19:57 on Fri 15 May.", "fact": "1981-05-14T14:46:14Z → 1981-05-15T16:56:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:27–13:15 on the 14th, 12:27–13:15 on the 15th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 14th and 48 of 48 on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 16245 s" }, { "step": "ruling", "text": "Paraśurāma Dvādaśī, Cairo, 1981: Friday 15 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "parashurama-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Parasurama dvadasi (purvaviddha), Rukmini dvadasi (purvaviddha)" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-15", "confidence": "determinate" } ], "quote": "In Cairo, Paraśurāma Dvādaśī 1981 falls on Friday 15 May. Dvādaśī runs from 17:46 on Thu 14 May to 19:57 on Fri 15 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/parashurama-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rukmini-dvadashi", "festival": "rukmini-dvadashi", "name": "Rukmiṇī Dvādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16245, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-05-14T17:46:14+03:00", "utc": "1981-05-14T14:46:14Z", "ms": 358699573655.84125 }, "end": { "local": "1981-05-15T19:56:54+03:00", "utc": "1981-05-15T16:56:54Z", "ms": 358793813614.6534 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-14T17:46:14+03:00", "utc": "1981-05-14T14:46:14Z", "ms": 358699573655.84125 }, "end": { "local": "1981-05-15T19:56:54+03:00", "utc": "1981-05-15T16:56:54Z", "ms": 358793813614.6534 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-14", "window": { "start": { "local": "1981-05-14T12:27:28+03:00", "utc": "1981-05-14T09:27:28Z", "ms": 358680448175.8198 }, "end": { "local": "1981-05-14T13:15:28+03:00", "utc": "1981-05-14T10:15:28Z", "ms": 358683328175.8198 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-05-15", "window": { "start": { "local": "1981-05-15T12:27:28+03:00", "utc": "1981-05-15T09:27:28Z", "ms": 358766848241.7322 }, "end": { "local": "1981-05-15T13:15:28+03:00", "utc": "1981-05-15T10:15:28Z", "ms": 358769728241.7322 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 17:46 on Thu 14 May to 19:57 on Fri 15 May.", "fact": "1981-05-14T14:46:14Z → 1981-05-15T16:56:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:27–13:15 on the 14th, 12:27–13:15 on the 15th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 14th and 48 of 48 on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 16245 s" }, { "step": "ruling", "text": "Rukmiṇī Dvādaśī, Cairo, 1981: Friday 15 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rukmini-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Parasurama dvadasi (purvaviddha), Rukmini dvadasi (purvaviddha)" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-15", "confidence": "determinate" } ], "quote": "In Cairo, Rukmiṇī Dvādaśī 1981 falls on Friday 15 May. Dvādaśī runs from 17:46 on Thu 14 May to 19:57 on Fri 15 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rukmini-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-05-16", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-16", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 950, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-05-15T19:56:54+03:00", "utc": "1981-05-15T16:56:54Z", "ms": 358793813614.6534 }, "end": { "local": "1981-05-16T22:17:16+03:00", "utc": "1981-05-16T19:17:16Z", "ms": 358888636380.0035 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-15T19:56:54+03:00", "utc": "1981-05-15T16:56:54Z", "ms": 358793813614.6534 }, "end": { "local": "1981-05-16T22:17:16+03:00", "utc": "1981-05-16T19:17:16Z", "ms": 358888636380.0035 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-05-15", "window": { "start": { "local": "1981-05-15T19:41:04+03:00", "utc": "1981-05-15T16:41:04Z", "ms": 358792863784.4872 }, "end": { "local": "1981-05-15T21:03:45+03:00", "utc": "1981-05-15T18:03:45Z", "ms": 358797825383.5539 } }, "covered_min": 67, "window_min": 83, "qualifies": true }, { "local_date": "1981-05-16", "window": { "start": { "local": "1981-05-16T19:41:42+03:00", "utc": "1981-05-16T16:41:42Z", "ms": 358879301937.08344 }, "end": { "local": "1981-05-16T21:04:14+03:00", "utc": "1981-05-16T18:04:14Z", "ms": 358884253698.1729 } }, "covered_min": 83, "window_min": 83, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 19:57 on Fri 15 May to 22:17 on Sat 16 May.", "fact": "1981-05-15T16:56:54Z → 1981-05-16T19:17:16Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:41–21:04 on the 15th, 19:42–21:04 on the 16th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 67 of 83 minutes on the 15th and 83 of 83 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Both evenings qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 950 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Saturday 16 May.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-16", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-16", "confidence": "boundary" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Saturday 16 May. Trayodaśī runs from 19:57 on Fri 15 May to 22:17 on Sat 16 May and covers all of pradoṣa that evening. It also reaches the previous evening for 67 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-05-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/nrisimha-chaturdashi", "festival": "nrisimha-chaturdashi", "name": "Nṛsiṃha Caturdaśī", "everyday": "Narasimha Jayanti", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4383, "anga": { "type": "tithi", "index": 13, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-05-16T22:17:16+03:00", "utc": "1981-05-16T19:17:16Z", "ms": 358888636380.0035 }, "end": { "local": "1981-05-18T00:41:09+03:00", "utc": "1981-05-17T21:41:09Z", "ms": 358983668667.4497 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-16T22:17:16+03:00", "utc": "1981-05-16T19:17:16Z", "ms": 358888636380.0035 }, "end": { "local": "1981-05-18T00:41:09+03:00", "utc": "1981-05-17T21:41:09Z", "ms": 358983668667.4497 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-05-16", "window": { "start": { "local": "1981-05-16T19:41:42+03:00", "utc": "1981-05-16T16:41:42Z", "ms": 358879301937.08344 }, "end": { "local": "1981-05-16T21:04:14+03:00", "utc": "1981-05-16T18:04:14Z", "ms": 358884253698.1729 } }, "covered_min": 0, "window_min": 83, "qualifies": false }, { "local_date": "1981-05-17", "window": { "start": { "local": "1981-05-17T19:42:20+03:00", "utc": "1981-05-17T16:42:20Z", "ms": 358965739898.14044 }, "end": { "local": "1981-05-17T21:04:42+03:00", "utc": "1981-05-17T18:04:42Z", "ms": 358970682020.97626 } }, "covered_min": 82, "window_min": 82, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 22:17 on Sat 16 May to 00:41 on Mon 18 May.", "fact": "1981-05-16T19:17:16Z → 1981-05-17T21:41:09Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:42–21:04 on the 16th, 19:42–21:05 on the 17th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during pradoṣa. It covers 0 of 83 minutes on the 16th and 82 of 82 on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 4383 s" }, { "step": "ruling", "text": "Nṛsiṃha Caturdaśī, Cairo, 1981: Sunday 17 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "nrisimha-chaturdashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 14 Nrsimha caturdasi (pradosa vyapini — if it occurs on two successive days, the second day is to be observed, special when combined with naksatra 'Svati', yoga 'Siddhi' and 'Saturday')." } ], "not_evaluated": "The row calls the day special with Svātī nakṣatra, Siddhi yoga and a Saturday; none is tested.", "kaala": "pradosha", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-17", "confidence": "determinate" } ], "quote": "In Cairo, Nṛsiṃha Caturdaśī (Narasimha Jayanti) 1981 falls on Sunday 17 May. Caturdaśī runs from 22:17 on Sat 16 May to 00:41 on Mon 18 May and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/nrisimha-chaturdashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/buddha-purnima", "festival": "buddha-purnima", "name": "Buddha Pūrṇimā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33839, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-05-18T00:41:09+03:00", "utc": "1981-05-17T21:41:09Z", "ms": 358983668667.4497 }, "end": { "local": "1981-05-19T03:03:35+03:00", "utc": "1981-05-19T00:03:35Z", "ms": 359078614902.99506 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-18T00:41:09+03:00", "utc": "1981-05-17T21:41:09Z", "ms": 358983668667.4497 }, "end": { "local": "1981-05-19T03:03:35+03:00", "utc": "1981-05-19T00:03:35Z", "ms": 359078614902.99506 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-18", "window": { "start": { "local": "1981-05-18T12:27:32+03:00", "utc": "1981-05-18T09:27:32Z", "ms": 359026051733.5714 }, "end": { "local": "1981-05-18T13:15:32+03:00", "utc": "1981-05-18T10:15:32Z", "ms": 359028931733.5714 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-05-19", "window": { "start": { "local": "1981-05-19T12:27:34+03:00", "utc": "1981-05-19T09:27:34Z", "ms": 359112453990.8402 }, "end": { "local": "1981-05-19T13:15:34+03:00", "utc": "1981-05-19T10:15:34Z", "ms": 359115333990.8402 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 00:41 on Mon 18 May to 03:04 on Tue 19 May.", "fact": "1981-05-17T21:41:09Z → 1981-05-19T00:03:35Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 18th, 12:28–13:16 on the 19th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 18th and 0 of 48 on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 33839 s" }, { "step": "ruling", "text": "Buddha Pūrṇimā, Cairo, 1981: Monday 18 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "buddha-purnima", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Sampat gauri vrata (paraviddha), Phuladola (Bengal & Orissa) (paraviddha), Gandhesvari puja (Bengal) (purvaviddha), Buddha purnima, Vaisakhi purnima." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-18", "confidence": "determinate" } ], "quote": "In Cairo, Buddha Pūrṇimā 1981 falls on Monday 18 May. Pūrṇimā runs from 00:41 on Mon 18 May to 03:04 on Tue 19 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/buddha-purnima", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sampat-gauri-vrata", "festival": "sampat-gauri-vrata", "name": "Sampat Gaurī Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33839, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-05-18T00:41:09+03:00", "utc": "1981-05-17T21:41:09Z", "ms": 358983668667.4497 }, "end": { "local": "1981-05-19T03:03:35+03:00", "utc": "1981-05-19T00:03:35Z", "ms": 359078614902.99506 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-18T00:41:09+03:00", "utc": "1981-05-17T21:41:09Z", "ms": 358983668667.4497 }, "end": { "local": "1981-05-19T03:03:35+03:00", "utc": "1981-05-19T00:03:35Z", "ms": 359078614902.99506 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-05-18", "window": { "start": { "local": "1981-05-18T12:27:32+03:00", "utc": "1981-05-18T09:27:32Z", "ms": 359026051733.5714 }, "end": { "local": "1981-05-18T13:15:32+03:00", "utc": "1981-05-18T10:15:32Z", "ms": 359028931733.5714 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-05-19", "window": { "start": { "local": "1981-05-19T12:27:34+03:00", "utc": "1981-05-19T09:27:34Z", "ms": 359112453990.8402 }, "end": { "local": "1981-05-19T13:15:34+03:00", "utc": "1981-05-19T10:15:34Z", "ms": 359115333990.8402 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 00:41 on Mon 18 May to 03:04 on Tue 19 May.", "fact": "1981-05-17T21:41:09Z → 1981-05-19T00:03:35Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 18th, 12:28–13:16 on the 19th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 18th and 0 of 48 on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 33839 s" }, { "step": "ruling", "text": "Sampat Gaurī Vrata, Cairo, 1981: Monday 18 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sampat-gauri-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Sampat gauri vrata (paraviddha), Phuladola (Bengal & Orissa) (paraviddha), Gandhesvari puja (Bengal) (purvaviddha), Buddha purnima, Vaisakhi purnima." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-18", "confidence": "determinate" } ], "quote": "In Cairo, Sampat Gaurī Vrata 1981 falls on Monday 18 May. Pūrṇimā runs from 00:41 on Mon 18 May to 03:04 on Tue 19 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/sampat-gauri-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-05-22", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 41018, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-05-22T09:19:33+03:00", "utc": "1981-05-22T06:19:33Z", "ms": 359360373240.8377 }, "end": { "local": "1981-05-23T10:51:16+03:00", "utc": "1981-05-23T07:51:16Z", "ms": 359452276358.73816 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-22T09:19:33+03:00", "utc": "1981-05-22T06:19:33Z", "ms": 359360373240.8377 }, "end": { "local": "1981-05-23T10:51:16+03:00", "utc": "1981-05-23T07:51:16Z", "ms": 359452276358.73816 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-05-21", "window": { "start": { "local": "1981-05-21T21:55:55+03:00", "utc": "1981-05-21T18:55:55Z", "ms": 359319355329.6233 }, "end": { "local": "1981-05-21T21:55:55+03:00", "utc": "1981-05-21T18:55:55Z", "ms": 359319355329.6233 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-05-22", "window": { "start": { "local": "1981-05-22T22:46:44+03:00", "utc": "1981-05-22T19:46:44Z", "ms": 359408804285.08295 }, "end": { "local": "1981-05-22T22:46:44+03:00", "utc": "1981-05-22T19:46:44Z", "ms": 359408804285.08295 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 09:20 on Fri 22 May to 10:51 on Sat 23 May.", "fact": "1981-05-22T06:19:33Z → 1981-05-23T07:51:16Z" }, { "step": "kaala", "text": "Moonrise is at 21:56 on the 21st and 22:47 on the 22nd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 21st and is on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 41018 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Friday 22 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-22", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Friday 22 May. Caturthī runs from 09:20 on Fri 22 May to 10:51 on Sat 23 May and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-05-22", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-05-29", "festival": "ekadashi", "name": "Aparā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3615, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-05-29T07:43:42+03:00", "utc": "1981-05-29T04:43:42Z", "ms": 359959422412.1719 }, "end": { "local": "1981-05-30T04:54:46+03:00", "utc": "1981-05-30T01:54:46Z", "ms": 360035686264.41327 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-29T07:43:42+03:00", "utc": "1981-05-29T04:43:42Z", "ms": 359959422412.1719 }, "end": { "local": "1981-05-30T04:54:46+03:00", "utc": "1981-05-30T01:54:46Z", "ms": 360035686264.41327 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-05-29", "window": { "start": { "local": "1981-05-29T05:55:19+03:00", "utc": "1981-05-29T02:55:19Z", "ms": 359952918561.3749 }, "end": { "local": "1981-05-29T05:55:19+03:00", "utc": "1981-05-29T02:55:19Z", "ms": 359952918561.3749 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-05-30", "window": { "start": { "local": "1981-05-30T05:55:01+03:00", "utc": "1981-05-30T02:55:01Z", "ms": 360039300934.4015 }, "end": { "local": "1981-05-30T05:55:01+03:00", "utc": "1981-05-30T02:55:01Z", "ms": 360039300934.4015 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 07:44 on Fri 29 May to 04:55 on Sat 30 May.", "fact": "1981-05-29T04:43:42Z → 1981-05-30T01:54:46Z" }, { "step": "kaala", "text": "Sunrise is at 05:55 on the 29th and 05:55 on the 30th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 29th and is not on the 30th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Neither sunrise qualifies. The day the tithi falls on is taken.", "fact": "priority: paraviddha → tithi-day · margin 3615 s" }, { "step": "ruling", "text": "Aparā Ekādaśī, Cairo, 1981: Friday 29 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-29", "confidence": "determinate" } ], "quote": "In Cairo, Aparā Ekādaśī 1981 falls on Friday 29 May. Ekādaśī runs from 07:44 on Fri 29 May to 04:55 on Sat 30 May, and is current at sunrise on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-05-29", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-05-31", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3004, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-05-31T01:37:36+03:00", "utc": "1981-05-30T22:37:36Z", "ms": 360110256475.55414 }, "end": { "local": "1981-05-31T22:01:13+03:00", "utc": "1981-05-31T19:01:13Z", "ms": 360183673205.97363 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-31T01:37:36+03:00", "utc": "1981-05-30T22:37:36Z", "ms": 360110256475.55414 }, "end": { "local": "1981-05-31T22:01:13+03:00", "utc": "1981-05-31T19:01:13Z", "ms": 360183673205.97363 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-05-30", "window": { "start": { "local": "1981-05-30T19:50:06+03:00", "utc": "1981-05-30T16:50:06Z", "ms": 360089405752.23395 }, "end": { "local": "1981-05-30T21:10:43+03:00", "utc": "1981-05-30T18:10:43Z", "ms": 360094242951.2167 } }, "covered_min": 0, "window_min": 81, "qualifies": false }, { "local_date": "1981-05-31", "window": { "start": { "local": "1981-05-31T19:50:39+03:00", "utc": "1981-05-31T16:50:39Z", "ms": 360175838531.73694 }, "end": { "local": "1981-05-31T21:11:09+03:00", "utc": "1981-05-31T18:11:09Z", "ms": 360180669392.7554 } }, "covered_min": 81, "window_min": 81, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 01:38 on Sun 31 May to 22:01 on Sun 31 May.", "fact": "1981-05-30T22:37:36Z → 1981-05-31T19:01:13Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:50–21:11 on the 30th, 19:51–21:11 on the 31st.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 81 minutes on the 30th and 81 of 81 on the 31st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 3004 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Sunday 31 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-31", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Sunday 31 May. Trayodaśī runs from 01:38 on Sun 31 May to 22:01 on Sun 31 May and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-05-31", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-05-31", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-05-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8841, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-05-31T22:01:13+03:00", "utc": "1981-05-31T19:01:13Z", "ms": 360183673205.97363 }, "end": { "local": "1981-06-01T18:15:42+03:00", "utc": "1981-06-01T15:15:42Z", "ms": 360256541959.85 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-05-31T22:01:13+03:00", "utc": "1981-05-31T19:01:13Z", "ms": 360183673205.97363 }, "end": { "local": "1981-06-01T18:15:42+03:00", "utc": "1981-06-01T15:15:42Z", "ms": 360256541959.85 } }, "kaala": "nishita", "days": [ { "local_date": "1981-05-31", "window": { "start": { "local": "1981-06-01T00:28:34+03:00", "utc": "1981-05-31T21:28:34Z", "ms": 360192514260.55597 }, "end": { "local": "1981-06-01T01:16:34+03:00", "utc": "1981-05-31T22:16:34Z", "ms": 360195394260.55597 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-06-01", "window": { "start": { "local": "1981-06-02T00:28:44+03:00", "utc": "1981-06-01T21:28:44Z", "ms": 360278923689.36835 }, "end": { "local": "1981-06-02T01:16:44+03:00", "utc": "1981-06-01T22:16:44Z", "ms": 360281803689.36835 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 22:01 on Sun 31 May to 18:16 on Mon 1 Jun.", "fact": "1981-05-31T19:01:13Z → 1981-06-01T15:15:42Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:29–01:17 on the 31st, 00:29–01:17 on the 1st.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 31st and 0 of 48 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 8841 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Sunday 31 May.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-05-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-05-31", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Sunday 31 May. Caturdaśī runs from 22:01 on Sun 31 May to 18:16 on Mon 1 Jun and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-05-31", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rambha-tritiya", "festival": "rambha-tritiya", "name": "Rambhā Tṛtīyā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16707, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-06-04T07:50:52+03:00", "utc": "1981-06-04T04:50:52Z", "ms": 360478251773.92346 }, "end": { "local": "1981-06-05T05:13:48+03:00", "utc": "1981-06-05T02:13:48Z", "ms": 360555228294.4469 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-04T07:50:52+03:00", "utc": "1981-06-04T04:50:52Z", "ms": 360478251773.92346 }, "end": { "local": "1981-06-05T05:13:48+03:00", "utc": "1981-06-05T02:13:48Z", "ms": 360555228294.4469 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-06-04", "window": { "start": { "local": "1981-06-04T12:29:19+03:00", "utc": "1981-06-04T09:29:19Z", "ms": 360494958791.89526 }, "end": { "local": "1981-06-04T13:17:19+03:00", "utc": "1981-06-04T10:17:19Z", "ms": 360497838791.89526 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-06-05", "window": { "start": { "local": "1981-06-05T12:29:29+03:00", "utc": "1981-06-05T09:29:29Z", "ms": 360581368960.4786 }, "end": { "local": "1981-06-05T13:17:29+03:00", "utc": "1981-06-05T10:17:29Z", "ms": 360584248960.4786 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 07:51 on Thu 4 Jun to 05:14 on Fri 5 Jun.", "fact": "1981-06-04T04:50:52Z → 1981-06-05T02:13:48Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 4th, 12:29–13:17 on the 5th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during madhyāhna. It covers 48 of 48 minutes on the 4th and 0 of 48 on the 5th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 16707 s" }, { "step": "ruling", "text": "Rambhā Tṛtīyā, Cairo, 1981: Thursday 4 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rambha-tritiya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Rambha trtiya (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-04", "confidence": "determinate" } ], "quote": "In Cairo, Rambhā Tṛtīyā 1981 falls on Thursday 4 June. Tṛtīyā runs from 07:51 on Thu 4 Jun to 05:14 on Fri 5 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rambha-tritiya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-06-05", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 26141, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-06-05T05:13:48+03:00", "utc": "1981-06-05T02:13:48Z", "ms": 360555228294.4469 }, "end": { "local": "1981-06-06T03:16:40+03:00", "utc": "1981-06-06T00:16:40Z", "ms": 360634600046.394 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-05T05:13:48+03:00", "utc": "1981-06-05T02:13:48Z", "ms": 360555228294.4469 }, "end": { "local": "1981-06-06T03:16:40+03:00", "utc": "1981-06-06T00:16:40Z", "ms": 360634600046.394 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-06-05", "window": { "start": { "local": "1981-06-05T12:29:29+03:00", "utc": "1981-06-05T09:29:29Z", "ms": 360581368960.4786 }, "end": { "local": "1981-06-05T13:17:29+03:00", "utc": "1981-06-05T10:17:29Z", "ms": 360584248960.4786 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-06-06", "window": { "start": { "local": "1981-06-06T12:29:39+03:00", "utc": "1981-06-06T09:29:39Z", "ms": 360667779435.21924 }, "end": { "local": "1981-06-06T13:17:39+03:00", "utc": "1981-06-06T10:17:39Z", "ms": 360670659435.21924 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:14 on Fri 5 Jun to 03:17 on Sat 6 Jun.", "fact": "1981-06-05T02:13:48Z → 1981-06-06T00:16:40Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 5th, 12:30–13:18 on the 6th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 5th and 0 of 48 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 26141 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Friday 5 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-05", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Friday 5 June. Caturthī runs from 05:14 on Fri 5 Jun to 03:17 on Sat 6 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-06-05", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/aranya-gauri-vrata", "festival": "aranya-gauri-vrata", "name": "Araṇya Gaurī Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 37488, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-06-07T02:05:02+03:00", "utc": "1981-06-06T23:05:02Z", "ms": 360716702311.4888 }, "end": { "local": "1981-06-08T01:41:30+03:00", "utc": "1981-06-07T22:41:30Z", "ms": 360801690136.3714 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-07T02:05:02+03:00", "utc": "1981-06-06T23:05:02Z", "ms": 360716702311.4888 }, "end": { "local": "1981-06-08T01:41:30+03:00", "utc": "1981-06-07T22:41:30Z", "ms": 360801690136.3714 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-06-07", "window": { "start": { "local": "1981-06-07T12:29:50+03:00", "utc": "1981-06-07T09:29:50Z", "ms": 360754190194.22253 }, "end": { "local": "1981-06-07T13:17:50+03:00", "utc": "1981-06-07T10:17:50Z", "ms": 360757070194.22253 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-06-08", "window": { "start": { "local": "1981-06-08T12:30:01+03:00", "utc": "1981-06-08T09:30:01Z", "ms": 360840601216.3253 }, "end": { "local": "1981-06-08T13:18:01+03:00", "utc": "1981-06-08T10:18:01Z", "ms": 360843481216.3253 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 02:05 on Sun 7 Jun to 01:42 on Mon 8 Jun.", "fact": "1981-06-06T23:05:02Z → 1981-06-07T22:41:30Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:30–13:18 on the 7th, 12:30–13:18 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 7th and 0 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 37488 s" }, { "step": "ruling", "text": "Araṇya Gaurī Vrata, Cairo, 1981: Sunday 7 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "aranya-gauri-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 6 Aranya sasthi, Aranya gauri vrata, (paraviddha), Skanda sasthi, (purvaviddha), Sitala sasthi yatra (Orissa)" } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-07", "confidence": "determinate" } ], "quote": "In Cairo, Araṇya Gaurī Vrata 1981 falls on Sunday 7 June. Ṣaṣṭhī runs from 02:05 on Sun 7 Jun to 01:42 on Mon 8 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/aranya-gauri-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/skanda-shashthi-jyaishtha", "festival": "skanda-shashthi-jyaishtha", "name": "Skanda Ṣaṣṭhī (Jyaiṣṭha)", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 37488, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-06-07T02:05:02+03:00", "utc": "1981-06-06T23:05:02Z", "ms": 360716702311.4888 }, "end": { "local": "1981-06-08T01:41:30+03:00", "utc": "1981-06-07T22:41:30Z", "ms": 360801690136.3714 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-07T02:05:02+03:00", "utc": "1981-06-06T23:05:02Z", "ms": 360716702311.4888 }, "end": { "local": "1981-06-08T01:41:30+03:00", "utc": "1981-06-07T22:41:30Z", "ms": 360801690136.3714 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-06-07", "window": { "start": { "local": "1981-06-07T12:29:50+03:00", "utc": "1981-06-07T09:29:50Z", "ms": 360754190194.22253 }, "end": { "local": "1981-06-07T13:17:50+03:00", "utc": "1981-06-07T10:17:50Z", "ms": 360757070194.22253 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-06-08", "window": { "start": { "local": "1981-06-08T12:30:01+03:00", "utc": "1981-06-08T09:30:01Z", "ms": 360840601216.3253 }, "end": { "local": "1981-06-08T13:18:01+03:00", "utc": "1981-06-08T10:18:01Z", "ms": 360843481216.3253 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 02:05 on Sun 7 Jun to 01:42 on Mon 8 Jun.", "fact": "1981-06-06T23:05:02Z → 1981-06-07T22:41:30Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:30–13:18 on the 7th, 12:30–13:18 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 7th and 0 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 37488 s" }, { "step": "ruling", "text": "Skanda Ṣaṣṭhī (Jyaiṣṭha), Cairo, 1981: Sunday 7 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "skanda-shashthi-jyaishtha", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 6 Aranya sasthi, Aranya gauri vrata, (paraviddha), Skanda sasthi, (purvaviddha), Sitala sasthi yatra (Orissa)" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-07", "confidence": "determinate" } ], "quote": "In Cairo, Skanda Ṣaṣṭhī (Jyaiṣṭha) 1981 falls on Sunday 7 June. Ṣaṣṭhī runs from 02:05 on Sun 7 Jun to 01:42 on Mon 8 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/skanda-shashthi-jyaishtha", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-06-13", "festival": "ekadashi", "name": "Nirjalā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3852, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-06-12T06:57:32+03:00", "utc": "1981-06-12T03:57:32Z", "ms": 361166252488.30054 }, "end": { "local": "1981-06-13T09:17:15+03:00", "utc": "1981-06-13T06:17:15Z", "ms": 361261034614.17194 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-12T06:57:32+03:00", "utc": "1981-06-12T03:57:32Z", "ms": 361166252488.30054 }, "end": { "local": "1981-06-13T09:17:15+03:00", "utc": "1981-06-13T06:17:15Z", "ms": 361261034614.17194 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-06-12", "window": { "start": { "local": "1981-06-12T05:53:20+03:00", "utc": "1981-06-12T02:53:20Z", "ms": 361162400272.90753 }, "end": { "local": "1981-06-12T05:53:20+03:00", "utc": "1981-06-12T02:53:20Z", "ms": 361162400272.90753 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-06-13", "window": { "start": { "local": "1981-06-13T05:53:22+03:00", "utc": "1981-06-13T02:53:22Z", "ms": 361248802117.8318 }, "end": { "local": "1981-06-13T05:53:22+03:00", "utc": "1981-06-13T02:53:22Z", "ms": 361248802117.8318 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 06:58 on Fri 12 Jun to 09:17 on Sat 13 Jun.", "fact": "1981-06-12T03:57:32Z → 1981-06-13T06:17:15Z" }, { "step": "kaala", "text": "Sunrise is at 05:53 on the 12th and 05:53 on the 13th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 12th and is on the 13th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 3852 s" }, { "step": "ruling", "text": "Nirjalā Ekādaśī, Cairo, 1981: Saturday 13 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-13", "confidence": "determinate" } ], "quote": "In Cairo, Nirjalā Ekādaśī 1981 falls on Saturday 13 June. Ekādaśī runs from 06:58 on Fri 12 Jun to 09:17 on Sat 13 Jun and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-06-13", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shri-rama-dvadashi", "festival": "shri-rama-dvadashi", "name": "Śrī Rāma Dvādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3002, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-06-13T09:17:15+03:00", "utc": "1981-06-13T06:17:15Z", "ms": 361261034614.17194 }, "end": { "local": "1981-06-14T11:41:10+03:00", "utc": "1981-06-14T08:41:10Z", "ms": 361356069912.9576 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-13T09:17:15+03:00", "utc": "1981-06-13T06:17:15Z", "ms": 361261034614.17194 }, "end": { "local": "1981-06-14T11:41:10+03:00", "utc": "1981-06-14T08:41:10Z", "ms": 361356069912.9576 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-06-13", "window": { "start": { "local": "1981-06-13T12:31:00+03:00", "utc": "1981-06-13T09:31:00Z", "ms": 361272659561.98444 }, "end": { "local": "1981-06-13T13:19:00+03:00", "utc": "1981-06-13T10:19:00Z", "ms": 361275539561.98444 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-06-14", "window": { "start": { "local": "1981-06-14T12:31:12+03:00", "utc": "1981-06-14T09:31:12Z", "ms": 361359071738.46716 }, "end": { "local": "1981-06-14T13:19:12+03:00", "utc": "1981-06-14T10:19:12Z", "ms": 361361951738.46716 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 09:17 on Sat 13 Jun to 11:41 on Sun 14 Jun.", "fact": "1981-06-13T06:17:15Z → 1981-06-14T08:41:10Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:31–13:19 on the 13th, 12:31–13:19 on the 14th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 13th and 0 of 48 on the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 3002 s" }, { "step": "ruling", "text": "Śrī Rāma Dvādaśī, Cairo, 1981: Saturday 13 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shri-rama-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Sri Rama dvadasi (purvaviddha), Campaka dvadasi (Orissa) (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-13", "confidence": "determinate" } ], "quote": "In Cairo, Śrī Rāma Dvādaśī 1981 falls on Saturday 13 June. Dvādaśī runs from 09:17 on Sat 13 Jun to 11:41 on Sun 14 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/shri-rama-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-06-14", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 21379, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-06-14T11:41:10+03:00", "utc": "1981-06-14T08:41:10Z", "ms": 361356069912.9576 }, "end": { "local": "1981-06-15T14:00:59+03:00", "utc": "1981-06-15T11:00:59Z", "ms": 361450858953.40735 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-14T11:41:10+03:00", "utc": "1981-06-14T08:41:10Z", "ms": 361356069912.9576 }, "end": { "local": "1981-06-15T14:00:59+03:00", "utc": "1981-06-15T11:00:59Z", "ms": 361450858953.40735 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-06-14", "window": { "start": { "local": "1981-06-14T19:56:58+03:00", "utc": "1981-06-14T16:56:58Z", "ms": 361385818197.8827 }, "end": { "local": "1981-06-14T21:16:30+03:00", "utc": "1981-06-14T18:16:30Z", "ms": 361390590403.8734 } }, "covered_min": 80, "window_min": 80, "qualifies": true }, { "local_date": "1981-06-15", "window": { "start": { "local": "1981-06-15T19:57:18+03:00", "utc": "1981-06-15T16:57:18Z", "ms": 361472238332.8836 }, "end": { "local": "1981-06-15T21:16:49+03:00", "utc": "1981-06-15T18:16:49Z", "ms": 361477008621.1007 } }, "covered_min": 0, "window_min": 80, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 11:41 on Sun 14 Jun to 14:01 on Mon 15 Jun.", "fact": "1981-06-14T08:41:10Z → 1981-06-15T11:00:59Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:57–21:17 on the 14th, 19:57–21:17 on the 15th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 80 of 80 minutes on the 14th and 0 of 80 on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 21379 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Sunday 14 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-14", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Sunday 14 June. Trayodaśī runs from 11:41 on Sun 14 Jun to 14:01 on Mon 15 Jun and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-06-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vata-savitri-vrata", "festival": "vata-savitri-vrata", "name": "Vaṭa Sāvitrī Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6808, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-06-16T16:10:18+03:00", "utc": "1981-06-16T13:10:18Z", "ms": 361545018192.15784 }, "end": { "local": "1981-06-17T18:04:27+03:00", "utc": "1981-06-17T15:04:27Z", "ms": 361638267429.4124 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-16T16:10:18+03:00", "utc": "1981-06-16T13:10:18Z", "ms": 361545018192.15784 }, "end": { "local": "1981-06-17T18:04:27+03:00", "utc": "1981-06-17T15:04:27Z", "ms": 361638267429.4124 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-06-16", "window": { "start": { "local": "1981-06-16T19:57:37+03:00", "utc": "1981-06-16T16:57:37Z", "ms": 361558657386.3155 }, "end": { "local": "1981-06-16T21:17:06+03:00", "utc": "1981-06-16T18:17:06Z", "ms": 361563426070.66327 } }, "covered_min": 79, "window_min": 79, "qualifies": true }, { "local_date": "1981-06-17", "window": { "start": { "local": "1981-06-17T19:57:55+03:00", "utc": "1981-06-17T16:57:55Z", "ms": 361645075334.28094 }, "end": { "local": "1981-06-17T21:17:23+03:00", "utc": "1981-06-17T18:17:23Z", "ms": 361649842729.6263 } }, "covered_min": 0, "window_min": 79, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 16:10 on Tue 16 Jun to 18:04 on Wed 17 Jun.", "fact": "1981-06-16T13:10:18Z → 1981-06-17T15:04:27Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:58–21:17 on the 16th, 19:58–21:17 on the 17th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during pradoṣa. It covers 79 of 79 minutes on the 16th and 0 of 79 on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 6808 s" }, { "step": "ruling", "text": "Vaṭa Sāvitrī Vrata, Cairo, 1981: Tuesday 16 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vata-savitri-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Vata-savitri vrata (Deccan) (pradosavyapini, purvaviddha), Snanayatra (Bengal & Orissa) (paraviddha)." } ], "kaala": "pradosha", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-16", "confidence": "determinate" } ], "quote": "In Cairo, Vaṭa Sāvitrī Vrata 1981 falls on Tuesday 16 June. Pūrṇimā runs from 16:10 on Tue 16 Jun to 18:04 on Wed 17 Jun and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/vata-savitri-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-06-20", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2190, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-06-20T21:43:49+03:00", "utc": "1981-06-20T18:43:49Z", "ms": 361910629455.0219 }, "end": { "local": "1981-06-21T22:06:48+03:00", "utc": "1981-06-21T19:06:48Z", "ms": 361998407561.7021 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-20T21:43:49+03:00", "utc": "1981-06-20T18:43:49Z", "ms": 361910629455.0219 }, "end": { "local": "1981-06-21T22:06:48+03:00", "utc": "1981-06-21T19:06:48Z", "ms": 361998407561.7021 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-06-20", "window": { "start": { "local": "1981-06-20T22:20:20+03:00", "utc": "1981-06-20T19:20:20Z", "ms": 361912819938.0185 }, "end": { "local": "1981-06-20T22:20:20+03:00", "utc": "1981-06-20T19:20:20Z", "ms": 361912819938.0185 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-06-21", "window": { "start": { "local": "1981-06-21T23:04:07+03:00", "utc": "1981-06-21T20:04:07Z", "ms": 362001846994.4234 }, "end": { "local": "1981-06-21T23:04:07+03:00", "utc": "1981-06-21T20:04:07Z", "ms": 362001846994.4234 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 21:44 on Sat 20 Jun to 22:07 on Sun 21 Jun.", "fact": "1981-06-20T18:43:49Z → 1981-06-21T19:06:48Z" }, { "step": "kaala", "text": "Moonrise is at 22:20 on the 20th and 23:04 on the 21st.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 20th and is not on the 21st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 2190 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Saturday 20 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-20", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Saturday 20 June. Caturthī runs from 21:44 on Sat 20 Jun to 22:07 on Sun 21 Jun and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-06-20", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-06-28", "festival": "ekadashi", "name": "Yoginī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17175, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-06-27T13:40:24+03:00", "utc": "1981-06-27T10:40:24Z", "ms": 362486423847.2609 }, "end": { "local": "1981-06-28T10:42:33+03:00", "utc": "1981-06-28T07:42:33Z", "ms": 362562152990.56976 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-27T13:40:24+03:00", "utc": "1981-06-27T10:40:24Z", "ms": 362486423847.2609 }, "end": { "local": "1981-06-28T10:42:33+03:00", "utc": "1981-06-28T07:42:33Z", "ms": 362562152990.56976 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-06-27", "window": { "start": { "local": "1981-06-27T05:55:59+03:00", "utc": "1981-06-27T02:55:59Z", "ms": 362458558728.1831 }, "end": { "local": "1981-06-27T05:55:59+03:00", "utc": "1981-06-27T02:55:59Z", "ms": 362458558728.1831 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-06-28", "window": { "start": { "local": "1981-06-28T05:56:18+03:00", "utc": "1981-06-28T02:56:18Z", "ms": 362544978464.3391 }, "end": { "local": "1981-06-28T05:56:18+03:00", "utc": "1981-06-28T02:56:18Z", "ms": 362544978464.3391 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 13:40 on Sat 27 Jun to 10:43 on Sun 28 Jun.", "fact": "1981-06-27T10:40:24Z → 1981-06-28T07:42:33Z" }, { "step": "kaala", "text": "Sunrise is at 05:56 on the 27th and 05:56 on the 28th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 27th and is on the 28th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 17175 s" }, { "step": "ruling", "text": "Yoginī Ekādaśī, Cairo, 1981: Sunday 28 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-28", "confidence": "determinate" } ], "quote": "In Cairo, Yoginī Ekādaśī 1981 falls on Sunday 28 June. Ekādaśī runs from 13:40 on Sat 27 Jun to 10:43 on Sun 28 Jun and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-06-28", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-06-29", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24956, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-06-29T07:31:34+03:00", "utc": "1981-06-29T04:31:34Z", "ms": 362637094303.12115 }, "end": { "local": "1981-06-30T04:15:30+03:00", "utc": "1981-06-30T01:15:30Z", "ms": 362711729645.78217 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-29T07:31:34+03:00", "utc": "1981-06-29T04:31:34Z", "ms": 362637094303.12115 }, "end": { "local": "1981-06-30T04:15:30+03:00", "utc": "1981-06-30T01:15:30Z", "ms": 362711729645.78217 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-06-28", "window": { "start": { "local": "1981-06-28T19:59:54+03:00", "utc": "1981-06-28T16:59:54Z", "ms": 362595593690.0137 }, "end": { "local": "1981-06-28T21:19:28+03:00", "utc": "1981-06-28T18:19:28Z", "ms": 362600367758.5708 } }, "covered_min": 0, "window_min": 80, "qualifies": false }, { "local_date": "1981-06-29", "window": { "start": { "local": "1981-06-29T19:59:57+03:00", "utc": "1981-06-29T16:59:57Z", "ms": 362681996748.46765 }, "end": { "local": "1981-06-29T21:19:33+03:00", "utc": "1981-06-29T18:19:33Z", "ms": 362686773303.8747 } }, "covered_min": 80, "window_min": 80, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 07:32 on Mon 29 Jun to 04:15 on Tue 30 Jun.", "fact": "1981-06-29T04:31:34Z → 1981-06-30T01:15:30Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 20:00–21:19 on the 28th, 20:00–21:20 on the 29th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 80 minutes on the 28th and 80 of 80 on the 29th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 24956 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Monday 29 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-29", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Monday 29 June. Trayodaśī runs from 07:32 on Mon 29 Jun to 04:15 on Tue 30 Jun and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-06-29", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-06-30", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-06-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1180, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-06-30T04:15:30+03:00", "utc": "1981-06-30T01:15:30Z", "ms": 362711729645.78217 }, "end": { "local": "1981-07-01T01:03:01+03:00", "utc": "1981-06-30T22:03:01Z", "ms": 362786580685.9543 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-06-30T04:15:30+03:00", "utc": "1981-06-30T01:15:30Z", "ms": 362711729645.78217 }, "end": { "local": "1981-07-01T01:03:01+03:00", "utc": "1981-06-30T22:03:01Z", "ms": 362786580685.9543 } }, "kaala": "nishita", "days": [ { "local_date": "1981-06-29", "window": { "start": { "local": "1981-06-30T00:34:29+03:00", "utc": "1981-06-29T21:34:29Z", "ms": 362698468831.24414 }, "end": { "local": "1981-06-30T01:22:29+03:00", "utc": "1981-06-29T22:22:29Z", "ms": 362701348831.24414 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-06-30", "window": { "start": { "local": "1981-07-01T00:34:40+03:00", "utc": "1981-06-30T21:34:40Z", "ms": 362784880499.5345 }, "end": { "local": "1981-07-01T01:22:40+03:00", "utc": "1981-06-30T22:22:40Z", "ms": 362787760499.5345 } }, "covered_min": 28, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 04:15 on Tue 30 Jun to 01:03 on Wed 1 Jul.", "fact": "1981-06-30T01:15:30Z → 1981-06-30T22:03:01Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:34–01:22 on the 29th, 00:35–01:23 on the 30th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 29th and 28 of 48 on the 30th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 1180 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Tuesday 30 June.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-06-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-06-30", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Tuesday 30 June. Caturdaśī runs from 04:15 on Tue 30 Jun to 01:03 on Wed 1 Jul and covers 28 of 48 minutes of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-06-30", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rathayatra", "festival": "rathayatra", "name": "Rathayātrā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13970, "anga": { "type": "tithi", "index": 1, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "1981-07-02T19:24:37+03:00", "utc": "1981-07-02T16:24:37Z", "ms": 362939077470.83777 }, "end": { "local": "1981-07-03T17:15:53+03:00", "utc": "1981-07-03T14:15:53Z", "ms": 363017752644.7174 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-02T19:24:37+03:00", "utc": "1981-07-02T16:24:37Z", "ms": 362939077470.83777 }, "end": { "local": "1981-07-03T17:15:53+03:00", "utc": "1981-07-03T14:15:53Z", "ms": 363017752644.7174 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-07-02", "window": { "start": { "local": "1981-07-02T12:34:51+03:00", "utc": "1981-07-02T09:34:51Z", "ms": 362914491375.3592 }, "end": { "local": "1981-07-02T13:22:51+03:00", "utc": "1981-07-02T10:22:51Z", "ms": 362917371375.3592 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-07-03", "window": { "start": { "local": "1981-07-03T12:35:02+03:00", "utc": "1981-07-03T09:35:02Z", "ms": 363000902318.1334 }, "end": { "local": "1981-07-03T13:23:02+03:00", "utc": "1981-07-03T10:23:02Z", "ms": 363003782318.1334 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 19:25 on Thu 2 Jul to 17:16 on Fri 3 Jul.", "fact": "1981-07-02T16:24:37Z → 1981-07-03T14:15:53Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:35–13:23 on the 2nd, 12:35–13:23 on the 3rd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvitīyā must be present during madhyāhna. It covers 0 of 48 minutes on the 2nd and 48 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 13970 s" }, { "step": "ruling", "text": "Rathayātrā, Cairo, 1981: Friday 3 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rathayatra", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 2 Rathayatra (paraviddha, special when combined with naksatra 'Pusya')" } ], "not_evaluated": "The row calls the day special with Puṣya nakṣatra; the nakṣatra is not tested.", "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-03", "confidence": "determinate" } ], "quote": "In Cairo, Rathayātrā 1981 falls on Friday 3 July. Dvitīyā runs from 19:25 on Thu 2 Jul to 17:16 on Fri 3 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rathayatra", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-07-05", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5446, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-07-04T15:43:58+03:00", "utc": "1981-07-04T12:43:58Z", "ms": 363098637822.06903 }, "end": { "local": "1981-07-05T14:54:09+03:00", "utc": "1981-07-05T11:54:09Z", "ms": 363182049236.04224 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-04T15:43:58+03:00", "utc": "1981-07-04T12:43:58Z", "ms": 363098637822.06903 }, "end": { "local": "1981-07-05T14:54:09+03:00", "utc": "1981-07-05T11:54:09Z", "ms": 363182049236.04224 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-07-04", "window": { "start": { "local": "1981-07-04T12:35:13+03:00", "utc": "1981-07-04T09:35:13Z", "ms": 363087312955.6891 }, "end": { "local": "1981-07-04T13:23:13+03:00", "utc": "1981-07-04T10:23:13Z", "ms": 363090192955.6891 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-07-05", "window": { "start": { "local": "1981-07-05T12:35:23+03:00", "utc": "1981-07-05T09:35:23Z", "ms": 363173723263.6987 }, "end": { "local": "1981-07-05T13:23:23+03:00", "utc": "1981-07-05T10:23:23Z", "ms": 363176603263.6987 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 15:44 on Sat 4 Jul to 14:54 on Sun 5 Jul.", "fact": "1981-07-04T12:43:58Z → 1981-07-05T11:54:09Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:35–13:23 on the 4th, 12:35–13:23 on the 5th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 4th and 48 of 48 on the 5th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 5446 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Sunday 5 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-05", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Sunday 5 July. Caturthī runs from 15:44 on Sat 4 Jul to 14:54 on Sun 5 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-07-05", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/skanda-panchami", "festival": "skanda-panchami", "name": "Skanda Pañcamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5134, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-07-05T14:54:09+03:00", "utc": "1981-07-05T11:54:09Z", "ms": 363182049236.04224 }, "end": { "local": "1981-07-06T14:49:07+03:00", "utc": "1981-07-06T11:49:07Z", "ms": 363268147222.3655 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-05T14:54:09+03:00", "utc": "1981-07-05T11:54:09Z", "ms": 363182049236.04224 }, "end": { "local": "1981-07-06T14:49:07+03:00", "utc": "1981-07-06T11:49:07Z", "ms": 363268147222.3655 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-07-05", "window": { "start": { "local": "1981-07-05T12:35:23+03:00", "utc": "1981-07-05T09:35:23Z", "ms": 363173723263.6987 }, "end": { "local": "1981-07-05T13:23:23+03:00", "utc": "1981-07-05T10:23:23Z", "ms": 363176603263.6987 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-07-06", "window": { "start": { "local": "1981-07-06T12:35:33+03:00", "utc": "1981-07-06T09:35:33Z", "ms": 363260133219.6237 }, "end": { "local": "1981-07-06T13:23:33+03:00", "utc": "1981-07-06T10:23:33Z", "ms": 363263013219.6237 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 14:54 on Sun 5 Jul to 14:49 on Mon 6 Jul.", "fact": "1981-07-05T11:54:09Z → 1981-07-06T11:49:07Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:35–13:23 on the 5th, 12:36–13:24 on the 6th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 0 of 48 minutes on the 5th and 48 of 48 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 5134 s" }, { "step": "ruling", "text": "Skanda Pañcamī, Cairo, 1981: Monday 6 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "skanda-panchami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Skanda pancami (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-06", "confidence": "determinate" } ], "quote": "In Cairo, Skanda Pañcamī 1981 falls on Monday 6 July. Pañcamī runs from 14:54 on Sun 5 Jul to 14:49 on Mon 6 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/skanda-panchami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vivasvat-saptami", "festival": "vivasvat-saptami", "name": "Vivasvat Saptamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7472, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-07-07T15:28:15+03:00", "utc": "1981-07-07T12:28:15Z", "ms": 363356894926.3469 }, "end": { "local": "1981-07-08T16:47:14+03:00", "utc": "1981-07-08T13:47:14Z", "ms": 363448034084.8695 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-07T15:28:15+03:00", "utc": "1981-07-07T12:28:15Z", "ms": 363356894926.3469 }, "end": { "local": "1981-07-08T16:47:14+03:00", "utc": "1981-07-08T13:47:14Z", "ms": 363448034084.8695 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-07-07", "window": { "start": { "local": "1981-07-07T12:35:43+03:00", "utc": "1981-07-07T09:35:43Z", "ms": 363346542802.5615 }, "end": { "local": "1981-07-07T13:23:43+03:00", "utc": "1981-07-07T10:23:43Z", "ms": 363349422802.5615 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-07-08", "window": { "start": { "local": "1981-07-08T12:35:52+03:00", "utc": "1981-07-08T09:35:52Z", "ms": 363432951993.1144 }, "end": { "local": "1981-07-08T13:23:52+03:00", "utc": "1981-07-08T10:23:52Z", "ms": 363435831993.1144 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 15:28 on Tue 7 Jul to 16:47 on Wed 8 Jul.", "fact": "1981-07-07T12:28:15Z → 1981-07-08T13:47:14Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:36–13:24 on the 7th, 12:36–13:24 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during madhyāhna. It covers 0 of 48 minutes on the 7th and 48 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 7472 s" }, { "step": "ruling", "text": "Vivasvat Saptamī, Cairo, 1981: Wednesday 8 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vivasvat-saptami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 7 Vivasvat saptami (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-08", "confidence": "determinate" } ], "quote": "In Cairo, Vivasvat Saptamī 1981 falls on Wednesday 8 July. Saptamī runs from 15:28 on Tue 7 Jul to 16:47 on Wed 8 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vivasvat-saptami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-07-12", "festival": "ekadashi", "name": "Hariśayanī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16287, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-07-11T23:12:13+03:00", "utc": "1981-07-11T20:12:13Z", "ms": 363730333292.03796 }, "end": { "local": "1981-07-13T01:31:27+03:00", "utc": "1981-07-12T22:31:27Z", "ms": 363825087316.67865 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-11T23:12:13+03:00", "utc": "1981-07-11T20:12:13Z", "ms": 363730333292.03796 }, "end": { "local": "1981-07-13T01:31:27+03:00", "utc": "1981-07-12T22:31:27Z", "ms": 363825087316.67865 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-07-12", "window": { "start": { "local": "1981-07-12T06:02:23+03:00", "utc": "1981-07-12T03:02:23Z", "ms": 363754943159.6793 }, "end": { "local": "1981-07-12T06:02:23+03:00", "utc": "1981-07-12T03:02:23Z", "ms": 363754943159.6793 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-07-13", "window": { "start": { "local": "1981-07-13T06:02:54+03:00", "utc": "1981-07-13T03:02:54Z", "ms": 363841374303.9962 }, "end": { "local": "1981-07-13T06:02:54+03:00", "utc": "1981-07-13T03:02:54Z", "ms": 363841374303.9962 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 23:12 on Sat 11 Jul to 01:31 on Mon 13 Jul.", "fact": "1981-07-11T20:12:13Z → 1981-07-12T22:31:27Z" }, { "step": "kaala", "text": "Sunrise is at 06:02 on the 12th and 06:03 on the 13th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 12th and is not on the 13th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 16287 s" }, { "step": "ruling", "text": "Hariśayanī Ekādaśī, Cairo, 1981: Sunday 12 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-12", "confidence": "determinate" } ], "quote": "In Cairo, Hariśayanī Ekādaśī 1981 falls on Sunday 12 July. Ekādaśī runs from 23:12 on Sat 11 Jul to 01:31 on Mon 13 Jul and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-07-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-07-14", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22754, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-07-14T03:38:05+03:00", "utc": "1981-07-14T00:38:05Z", "ms": 363919085335.43713 }, "end": { "local": "1981-07-15T05:24:27+03:00", "utc": "1981-07-15T02:24:27Z", "ms": 364011866686.38385 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-14T03:38:05+03:00", "utc": "1981-07-14T00:38:05Z", "ms": 363919085335.43713 }, "end": { "local": "1981-07-15T05:24:27+03:00", "utc": "1981-07-15T02:24:27Z", "ms": 364011866686.38385 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-07-13", "window": { "start": { "local": "1981-07-13T19:58:09+03:00", "utc": "1981-07-13T16:58:09Z", "ms": 363891488639.05066 }, "end": { "local": "1981-07-13T21:18:51+03:00", "utc": "1981-07-13T18:18:51Z", "ms": 363896330947.1812 } }, "covered_min": 0, "window_min": 81, "qualifies": false }, { "local_date": "1981-07-14", "window": { "start": { "local": "1981-07-14T19:57:50+03:00", "utc": "1981-07-14T16:57:50Z", "ms": 363977869992.05273 }, "end": { "local": "1981-07-14T21:18:39+03:00", "utc": "1981-07-14T18:18:39Z", "ms": 363982719069.00165 } }, "covered_min": 81, "window_min": 81, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 03:38 on Tue 14 Jul to 05:24 on Wed 15 Jul.", "fact": "1981-07-14T00:38:05Z → 1981-07-15T02:24:27Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:58–21:19 on the 13th, 19:58–21:19 on the 14th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 81 minutes on the 13th and 81 of 81 on the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 22754 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Tuesday 14 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-14", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Tuesday 14 July. Trayodaśī runs from 03:38 on Tue 14 Jul to 05:24 on Wed 15 Jul and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-07-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vyasa-puja", "festival": "vyasa-puja", "name": "Vyāsa Pūjā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-16", "confidence": "boundary", "boundary_reasons": [ "absent-unstated" ], "boundary_margin_s": 2462, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 } }, "kaala": "udaya-3", "days": [ { "local_date": "1981-07-16", "window": { "start": { "local": "1981-07-16T06:04:31+03:00", "utc": "1981-07-16T03:04:31Z", "ms": 364100670633.672 }, "end": { "local": "1981-07-16T08:51:02+03:00", "utc": "1981-07-16T05:51:02Z", "ms": 364110662171.65283 } }, "covered_min": 125, "window_min": 167, "qualifies": false }, { "local_date": "1981-07-17", "window": { "start": { "local": "1981-07-17T06:05:04+03:00", "utc": "1981-07-17T03:05:04Z", "ms": 364187103616.72076 }, "end": { "local": "1981-07-17T08:51:24+03:00", "utc": "1981-07-17T05:51:24Z", "ms": 364197083957.21185 } }, "covered_min": 94, "window_min": 166, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul.", "fact": "1981-07-16T03:45:33Z → 1981-07-17T04:38:49Z" }, { "step": "kaala", "text": "The first three muhūrtas after sunrise is first 3 of 15 day muhūrtas: 06:05–08:51 on the 16th, 06:05–08:51 on the 17th.", "fact": "udaya-3: day-muhurta-1-3 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must hold through the first three muhūrtas after sunrise. It covers 125 of 167 minutes on the 16th and 94 of 166 on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Neither morning qualifies. The day the tithi falls on is taken.", "fact": "priority: paraviddha → tithi-day · margin 2462 s" }, { "step": "ruling", "text": "Vyāsa Pūjā, Cairo, 1981: Thursday 16 July.", "fact": "confidence: boundary (absent-unstated)" } ], "rule": { "kind": "lunar", "id": "vyasa-puja", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini)." } ], "kaala": "udaya-3", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-16", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-16", "confidence": "boundary" } ], "quote": "In Cairo, Vyāsa Pūjā 1981 falls on Thursday 16 July. Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul, and reaches the first three muhūrtas after sunrise on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/vyasa-puja", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/guru-purnima", "festival": "guru-purnima", "name": "Guru Pūrṇimā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17885, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-07-16", "window": { "start": { "local": "1981-07-16T12:36:49+03:00", "utc": "1981-07-16T09:36:49Z", "ms": 364124209478.62415 }, "end": { "local": "1981-07-16T13:24:49+03:00", "utc": "1981-07-16T10:24:49Z", "ms": 364127089478.62415 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-07-17", "window": { "start": { "local": "1981-07-17T12:36:54+03:00", "utc": "1981-07-17T09:36:54Z", "ms": 364210614467.9485 }, "end": { "local": "1981-07-17T13:24:54+03:00", "utc": "1981-07-17T10:24:54Z", "ms": 364213494467.9485 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul.", "fact": "1981-07-16T03:45:33Z → 1981-07-17T04:38:49Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 16th, 12:37–13:25 on the 17th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 16th and 0 of 48 on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 17885 s" }, { "step": "ruling", "text": "Guru Pūrṇimā, Cairo, 1981: Thursday 16 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "guru-purnima", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-16", "confidence": "determinate" } ], "quote": "In Cairo, Guru Pūrṇimā 1981 falls on Thursday 16 July. Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/guru-purnima", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/kokila-vrata", "festival": "kokila-vrata", "name": "Kokilā Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34296, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 } }, "kaala": "sayahna", "days": [ { "local_date": "1981-07-16", "window": { "start": { "local": "1981-07-16T17:10:37+03:00", "utc": "1981-07-16T14:10:37Z", "ms": 364140636785.5954 }, "end": { "local": "1981-07-16T19:57:08+03:00", "utc": "1981-07-16T16:57:08Z", "ms": 364150628323.57623 } }, "covered_min": 167, "window_min": 167, "qualifies": true }, { "local_date": "1981-07-17", "window": { "start": { "local": "1981-07-17T17:10:25+03:00", "utc": "1981-07-17T14:10:25Z", "ms": 364227024978.68506 }, "end": { "local": "1981-07-17T19:56:45+03:00", "utc": "1981-07-17T16:56:45Z", "ms": 364237005319.17615 } }, "covered_min": 0, "window_min": 166, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul.", "fact": "1981-07-16T03:45:33Z → 1981-07-17T04:38:49Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 17:11–19:57 on the 16th, 17:10–19:57 on the 17th.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during sāyāhna. It covers 167 of 167 minutes on the 16th and 0 of 166 on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one late afternoon qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 34296 s" }, { "step": "ruling", "text": "Kokilā Vrata, Cairo, 1981: Thursday 16 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "kokila-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini)." } ], "kaala": "sayahna", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-16", "confidence": "determinate" } ], "quote": "In Cairo, Kokilā Vrata 1981 falls on Thursday 16 July. Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul and covers all of sāyāhna that late afternoon.", "cite": "https://ahargana.org/cairo/festivals/1981/kokila-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shiva-shayanotsava", "festival": "shiva-shayanotsava", "name": "Śiva Śayanotsava", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34027, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "1981-07-16T06:45:33+03:00", "utc": "1981-07-16T03:45:33Z", "ms": 364103132563.0618 }, "end": { "local": "1981-07-17T07:38:49+03:00", "utc": "1981-07-17T04:38:49Z", "ms": 364192729254.3843 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-07-15", "window": { "start": { "local": "1981-07-15T19:57:30+03:00", "utc": "1981-07-15T16:57:30Z", "ms": 364064249884.2621 }, "end": { "local": "1981-07-15T21:18:26+03:00", "utc": "1981-07-15T18:18:26Z", "ms": 364069105984.1834 } }, "covered_min": 0, "window_min": 81, "qualifies": false }, { "local_date": "1981-07-16", "window": { "start": { "local": "1981-07-16T19:57:08+03:00", "utc": "1981-07-16T16:57:08Z", "ms": 364150628323.57623 }, "end": { "local": "1981-07-16T21:18:12+03:00", "utc": "1981-07-16T18:18:12Z", "ms": 364155491695.9955 } }, "covered_min": 81, "window_min": 81, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul.", "fact": "1981-07-16T03:45:33Z → 1981-07-17T04:38:49Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:57–21:18 on the 15th, 19:57–21:18 on the 16th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during pradoṣa. It covers 0 of 81 minutes on the 15th and 81 of 81 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 34027 s" }, { "step": "ruling", "text": "Śiva Śayanotsava, Cairo, 1981: Thursday 16 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shiva-shayanotsava", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini)." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-16", "confidence": "determinate" } ], "quote": "In Cairo, Śiva Śayanotsava 1981 falls on Thursday 16 July. Pūrṇimā runs from 06:46 on Thu 16 Jul to 07:39 on Fri 17 Jul and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/shiva-shayanotsava", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ashunya-shayana-vrata-ashadha", "festival": "ashunya-shayana-vrata-ashadha", "name": "Aśūnya Śayana Vrata (Āṣāḍha)", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 39456, "anga": { "type": "tithi", "index": 16, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "1981-07-18T08:03:35+03:00", "utc": "1981-07-18T05:03:35Z", "ms": 364280615373.0386 }, "end": { "local": "1981-07-19T08:00:26+03:00", "utc": "1981-07-19T05:00:26Z", "ms": 364366825869.55554 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-07-18T08:03:35+03:00", "utc": "1981-07-18T05:03:35Z", "ms": 364280615373.0386 }, "end": { "local": "1981-07-19T08:00:26+03:00", "utc": "1981-07-19T05:00:26Z", "ms": 364366825869.55554 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-07-17", "window": { "start": { "local": "1981-07-17T20:17:15+03:00", "utc": "1981-07-17T17:17:15Z", "ms": 364238235484.7953 }, "end": { "local": "1981-07-17T20:17:15+03:00", "utc": "1981-07-17T17:17:15Z", "ms": 364238235484.7953 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-07-18", "window": { "start": { "local": "1981-07-18T21:02:50+03:00", "utc": "1981-07-18T18:02:50Z", "ms": 364327370319.1421 }, "end": { "local": "1981-07-18T21:02:50+03:00", "utc": "1981-07-18T18:02:50Z", "ms": 364327370319.1421 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 08:04 on Sat 18 Jul to 08:00 on Sun 19 Jul.", "fact": "1981-07-18T05:03:35Z → 1981-07-19T05:00:26Z" }, { "step": "kaala", "text": "Moonrise is at 20:17 on the 17th and 21:03 on the 18th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Dvitīyā must be current at moonrise. It is not on the 17th and is on the 18th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 39456 s" }, { "step": "ruling", "text": "Aśūnya Śayana Vrata (Āṣāḍha), Cairo, 1981: Saturday 18 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ashunya-shayana-vrata-ashadha", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 102", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 2 Asunya sayana vrata (candrodaya vyapini; purvahna vyapini and purvaviddha in Bengal)." } ], "not_evaluated": "In Bengal the row reads pūrvāhṇa and pūrvaviddha; that reading is not applied.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-18", "confidence": "determinate" } ], "quote": "In Cairo, Aśūnya Śayana Vrata (Āṣāḍha) 1981 falls on Saturday 18 July. Dvitīyā runs from 08:04 on Sat 18 Jul to 08:00 on Sun 19 Jul and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ashunya-shayana-vrata-ashadha", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-07-20", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 29464, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-07-20T07:30:41+03:00", "utc": "1981-07-20T04:30:41Z", "ms": 364451441364.97534 }, "end": { "local": "1981-07-21T06:36:07+03:00", "utc": "1981-07-21T03:36:07Z", "ms": 364534566888.55975 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-07-20T07:30:41+03:00", "utc": "1981-07-20T04:30:41Z", "ms": 364451441364.97534 }, "end": { "local": "1981-07-21T06:36:07+03:00", "utc": "1981-07-21T03:36:07Z", "ms": 364534566888.55975 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-07-19", "window": { "start": { "local": "1981-07-19T21:45:17+03:00", "utc": "1981-07-19T18:45:17Z", "ms": 364416316888.616 }, "end": { "local": "1981-07-19T21:45:17+03:00", "utc": "1981-07-19T18:45:17Z", "ms": 364416316888.616 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-07-20", "window": { "start": { "local": "1981-07-20T22:25:03+03:00", "utc": "1981-07-20T19:25:03Z", "ms": 364505103372.4433 }, "end": { "local": "1981-07-20T22:25:03+03:00", "utc": "1981-07-20T19:25:03Z", "ms": 364505103372.4433 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 07:31 on Mon 20 Jul to 06:36 on Tue 21 Jul.", "fact": "1981-07-20T04:30:41Z → 1981-07-21T03:36:07Z" }, { "step": "kaala", "text": "Moonrise is at 21:45 on the 19th and 22:25 on the 20th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 19th and is on the 20th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 29464 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Monday 20 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-20", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Monday 20 July. Caturthī runs from 07:31 on Mon 20 Jul to 06:36 on Tue 21 Jul and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-07-20", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-07-27", "festival": "ekadashi", "name": "Kāmikā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35323, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-07-26T18:35:38+03:00", "utc": "1981-07-26T15:35:38Z", "ms": 365009738348.60425 }, "end": { "local": "1981-07-27T15:59:34+03:00", "utc": "1981-07-27T12:59:34Z", "ms": 365086773837.5726 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-07-26T18:35:38+03:00", "utc": "1981-07-26T15:35:38Z", "ms": 365009738348.60425 }, "end": { "local": "1981-07-27T15:59:34+03:00", "utc": "1981-07-27T12:59:34Z", "ms": 365086773837.5726 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-07-26", "window": { "start": { "local": "1981-07-26T06:10:15+03:00", "utc": "1981-07-26T03:10:15Z", "ms": 364965015259.06055 }, "end": { "local": "1981-07-26T06:10:15+03:00", "utc": "1981-07-26T03:10:15Z", "ms": 364965015259.06055 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-07-27", "window": { "start": { "local": "1981-07-27T06:10:51+03:00", "utc": "1981-07-27T03:10:51Z", "ms": 365051451096.3437 }, "end": { "local": "1981-07-27T06:10:51+03:00", "utc": "1981-07-27T03:10:51Z", "ms": 365051451096.3437 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 18:36 on Sun 26 Jul to 16:00 on Mon 27 Jul.", "fact": "1981-07-26T15:35:38Z → 1981-07-27T12:59:34Z" }, { "step": "kaala", "text": "Sunrise is at 06:10 on the 26th and 06:11 on the 27th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 26th and is on the 27th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 35323 s" }, { "step": "ruling", "text": "Kāmikā Ekādaśī, Cairo, 1981: Monday 27 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-27", "confidence": "determinate" } ], "quote": "In Cairo, Kāmikā Ekādaśī 1981 falls on Monday 27 July. Ekādaśī runs from 18:36 on Sun 26 Jul to 16:00 on Mon 27 Jul and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-07-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-07-28", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23155, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-07-28T13:25:06+03:00", "utc": "1981-07-28T10:25:06Z", "ms": 365163905502.4758 }, "end": { "local": "1981-07-29T10:58:05+03:00", "utc": "1981-07-29T07:58:05Z", "ms": 365241485342.8578 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-07-28T13:25:06+03:00", "utc": "1981-07-28T10:25:06Z", "ms": 365163905502.4758 }, "end": { "local": "1981-07-29T10:58:05+03:00", "utc": "1981-07-29T07:58:05Z", "ms": 365241485342.8578 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-07-28", "window": { "start": { "local": "1981-07-28T19:51:00+03:00", "utc": "1981-07-28T16:51:00Z", "ms": 365187060412.51373 }, "end": { "local": "1981-07-28T21:13:49+03:00", "utc": "1981-07-28T18:13:49Z", "ms": 365192028784.0769 } }, "covered_min": 83, "window_min": 83, "qualifies": true }, { "local_date": "1981-07-29", "window": { "start": { "local": "1981-07-29T19:50:21+03:00", "utc": "1981-07-29T16:50:21Z", "ms": 365273421047.3817 }, "end": { "local": "1981-07-29T21:13:19+03:00", "utc": "1981-07-29T18:13:19Z", "ms": 365278399495.9758 } }, "covered_min": 0, "window_min": 83, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 13:25 on Tue 28 Jul to 10:58 on Wed 29 Jul.", "fact": "1981-07-28T10:25:06Z → 1981-07-29T07:58:05Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:51–21:14 on the 28th, 19:50–21:13 on the 29th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 83 of 83 minutes on the 28th and 0 of 83 on the 29th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 23155 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Tuesday 28 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-28", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Tuesday 28 July. Trayodaśī runs from 13:25 on Tue 28 Jul to 10:58 on Wed 29 Jul and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-07-28", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-07-29", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-07-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 26362, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-07-29T10:58:05+03:00", "utc": "1981-07-29T07:58:05Z", "ms": 365241485342.8578 }, "end": { "local": "1981-07-30T08:44:52+03:00", "utc": "1981-07-30T05:44:52Z", "ms": 365319892038.3763 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-07-29T10:58:05+03:00", "utc": "1981-07-29T07:58:05Z", "ms": 365241485342.8578 }, "end": { "local": "1981-07-30T08:44:52+03:00", "utc": "1981-07-30T05:44:52Z", "ms": 365319892038.3763 } }, "kaala": "nishita", "days": [ { "local_date": "1981-07-28", "window": { "start": { "local": "1981-07-29T00:37:32+03:00", "utc": "1981-07-28T21:37:32Z", "ms": 365204251805.87573 }, "end": { "local": "1981-07-29T01:25:32+03:00", "utc": "1981-07-28T22:25:32Z", "ms": 365207131805.87573 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-07-29", "window": { "start": { "local": "1981-07-30T00:37:30+03:00", "utc": "1981-07-29T21:37:30Z", "ms": 365290650229.6096 }, "end": { "local": "1981-07-30T01:25:30+03:00", "utc": "1981-07-29T22:25:30Z", "ms": 365293530229.6096 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 10:58 on Wed 29 Jul to 08:45 on Thu 30 Jul.", "fact": "1981-07-29T07:58:05Z → 1981-07-30T05:44:52Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:38–01:26 on the 28th, 00:38–01:26 on the 29th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 28th and 48 of 48 on the 29th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 26362 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Wednesday 29 July.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-07-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-07-29", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Wednesday 29 July. Caturdaśī runs from 10:58 on Wed 29 Jul to 08:45 on Thu 30 Jul and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-07-29", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/madhusrava-tritiya", "festival": "madhusrava-tritiya", "name": "Madhusravā Tṛtīyā", "everyday": "Hariyali Teej", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 29106, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-08-02T04:31:54+03:00", "utc": "1981-08-02T01:31:54Z", "ms": 365563913761.8899 }, "end": { "local": "1981-08-03T04:15:00+03:00", "utc": "1981-08-03T01:15:00Z", "ms": 365649299747.0924 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-02T04:31:54+03:00", "utc": "1981-08-02T01:31:54Z", "ms": 365563913761.8899 }, "end": { "local": "1981-08-03T04:15:00+03:00", "utc": "1981-08-03T01:15:00Z", "ms": 365649299747.0924 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-02", "window": { "start": { "local": "1981-08-02T12:37:00+03:00", "utc": "1981-08-02T09:37:00Z", "ms": 365593019657.9309 }, "end": { "local": "1981-08-02T13:25:00+03:00", "utc": "1981-08-02T10:25:00Z", "ms": 365595899657.9309 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-08-03", "window": { "start": { "local": "1981-08-03T12:36:55+03:00", "utc": "1981-08-03T09:36:55Z", "ms": 365679415026.2412 }, "end": { "local": "1981-08-03T13:24:55+03:00", "utc": "1981-08-03T10:24:55Z", "ms": 365682295026.2412 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 04:32 on Sun 2 Aug to 04:15 on Mon 3 Aug.", "fact": "1981-08-02T01:31:54Z → 1981-08-03T01:15:00Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 2nd, 12:37–13:25 on the 3rd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during madhyāhna. It covers 48 of 48 minutes on the 2nd and 0 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 29106 s" }, { "step": "ruling", "text": "Madhusravā Tṛtīyā, Cairo, 1981: Sunday 2 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "madhusrava-tritiya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Madhusrava (Gujerat) (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-02", "confidence": "determinate" } ], "quote": "In Cairo, Madhusravā Tṛtīyā (Hariyali Teej) 1981 falls on Sunday 2 August. Tṛtīyā runs from 04:32 on Sun 2 Aug to 04:15 on Mon 3 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/madhusrava-tritiya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-08-03", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28765, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-08-03T04:15:00+03:00", "utc": "1981-08-03T01:15:00Z", "ms": 365649299747.0924 }, "end": { "local": "1981-08-04T04:37:25+03:00", "utc": "1981-08-04T01:37:25Z", "ms": 365737045011.0882 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-03T04:15:00+03:00", "utc": "1981-08-03T01:15:00Z", "ms": 365649299747.0924 }, "end": { "local": "1981-08-04T04:37:25+03:00", "utc": "1981-08-04T01:37:25Z", "ms": 365737045011.0882 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-03", "window": { "start": { "local": "1981-08-03T12:36:55+03:00", "utc": "1981-08-03T09:36:55Z", "ms": 365679415026.2412 }, "end": { "local": "1981-08-03T13:24:55+03:00", "utc": "1981-08-03T10:24:55Z", "ms": 365682295026.2412 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-08-04", "window": { "start": { "local": "1981-08-04T12:36:50+03:00", "utc": "1981-08-04T09:36:50Z", "ms": 365765809783.43677 }, "end": { "local": "1981-08-04T13:24:50+03:00", "utc": "1981-08-04T10:24:50Z", "ms": 365768689783.43677 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 04:15 on Mon 3 Aug to 04:37 on Tue 4 Aug.", "fact": "1981-08-03T01:15:00Z → 1981-08-04T01:37:25Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 3rd, 12:37–13:25 on the 4th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 3rd and 0 of 48 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 28765 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Monday 3 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-03", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Monday 3 August. Caturthī runs from 04:15 on Mon 3 Aug to 04:37 on Tue 4 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-08-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/naga-panchami", "festival": "naga-panchami", "name": "Nāga Pañcamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25083, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-08-04T04:37:25+03:00", "utc": "1981-08-04T01:37:25Z", "ms": 365737045011.0882 }, "end": { "local": "1981-08-05T05:38:41+03:00", "utc": "1981-08-05T02:38:41Z", "ms": 365827120732.7763 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-04T04:37:25+03:00", "utc": "1981-08-04T01:37:25Z", "ms": 365737045011.0882 }, "end": { "local": "1981-08-05T05:38:41+03:00", "utc": "1981-08-05T02:38:41Z", "ms": 365827120732.7763 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-04", "window": { "start": { "local": "1981-08-04T12:36:50+03:00", "utc": "1981-08-04T09:36:50Z", "ms": 365765809783.43677 }, "end": { "local": "1981-08-04T13:24:50+03:00", "utc": "1981-08-04T10:24:50Z", "ms": 365768689783.43677 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-08-05", "window": { "start": { "local": "1981-08-05T12:36:44+03:00", "utc": "1981-08-05T09:36:44Z", "ms": 365852203929.7867 }, "end": { "local": "1981-08-05T13:24:44+03:00", "utc": "1981-08-05T10:24:44Z", "ms": 365855083929.7867 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 04:37 on Tue 4 Aug to 05:39 on Wed 5 Aug.", "fact": "1981-08-04T01:37:25Z → 1981-08-05T02:38:41Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 4th, 12:37–13:25 on the 5th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 48 of 48 minutes on the 4th and 0 of 48 on the 5th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 25083 s" }, { "step": "ruling", "text": "Nāga Pañcamī, Cairo, 1981: Tuesday 4 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "naga-panchami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Naga pancami (paraviddha)" } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-04", "confidence": "determinate" } ], "quote": "In Cairo, Nāga Pañcamī 1981 falls on Tuesday 4 August. Pañcamī runs from 04:37 on Tue 4 Aug to 05:39 on Wed 5 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/naga-panchami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-08-11", "festival": "ekadashi", "name": "Putradā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35422, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-08-10T16:09:39+03:00", "utc": "1981-08-10T13:09:39Z", "ms": 366296979396.62054 }, "end": { "local": "1981-08-11T17:58:49+03:00", "utc": "1981-08-11T14:58:49Z", "ms": 366389928715.32263 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-10T16:09:39+03:00", "utc": "1981-08-10T13:09:39Z", "ms": 366296979396.62054 }, "end": { "local": "1981-08-11T17:58:49+03:00", "utc": "1981-08-11T14:58:49Z", "ms": 366389928715.32263 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-08-10", "window": { "start": { "local": "1981-08-10T06:19:18+03:00", "utc": "1981-08-10T03:19:18Z", "ms": 366261557867.7013 }, "end": { "local": "1981-08-10T06:19:18+03:00", "utc": "1981-08-10T03:19:18Z", "ms": 366261557867.7013 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-08-11", "window": { "start": { "local": "1981-08-11T06:19:54+03:00", "utc": "1981-08-11T03:19:54Z", "ms": 366347993665.03546 }, "end": { "local": "1981-08-11T06:19:54+03:00", "utc": "1981-08-11T03:19:54Z", "ms": 366347993665.03546 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 16:10 on Mon 10 Aug to 17:59 on Tue 11 Aug.", "fact": "1981-08-10T13:09:39Z → 1981-08-11T14:58:49Z" }, { "step": "kaala", "text": "Sunrise is at 06:19 on the 10th and 06:20 on the 11th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 10th and is on the 11th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 35422 s" }, { "step": "ruling", "text": "Putradā Ekādaśī, Cairo, 1981: Tuesday 11 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-11", "confidence": "determinate" } ], "quote": "In Cairo, Putradā Ekādaśī 1981 falls on Tuesday 11 August. Ekādaśī runs from 16:10 on Mon 10 Aug to 17:59 on Tue 11 Aug and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-08-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/damodara-dvadashi", "festival": "damodara-dvadashi", "name": "Dāmodara Dvādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16493, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-08-11T17:58:49+03:00", "utc": "1981-08-11T14:58:49Z", "ms": 366389928715.32263 }, "end": { "local": "1981-08-12T19:17:19+03:00", "utc": "1981-08-12T16:17:19Z", "ms": 366481039001.4711 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-11T17:58:49+03:00", "utc": "1981-08-11T14:58:49Z", "ms": 366389928715.32263 }, "end": { "local": "1981-08-12T19:17:19+03:00", "utc": "1981-08-12T16:17:19Z", "ms": 366481039001.4711 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-11", "window": { "start": { "local": "1981-08-11T12:35:56+03:00", "utc": "1981-08-11T09:35:56Z", "ms": 366370556166.23804 }, "end": { "local": "1981-08-11T13:23:56+03:00", "utc": "1981-08-11T10:23:56Z", "ms": 366373436166.23804 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-08-12", "window": { "start": { "local": "1981-08-12T12:35:46+03:00", "utc": "1981-08-12T09:35:46Z", "ms": 366456946155.05444 }, "end": { "local": "1981-08-12T13:23:46+03:00", "utc": "1981-08-12T10:23:46Z", "ms": 366459826155.05444 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 17:59 on Tue 11 Aug to 19:17 on Wed 12 Aug.", "fact": "1981-08-11T14:58:49Z → 1981-08-12T16:17:19Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:36–13:24 on the 11th, 12:36–13:24 on the 12th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 11th and 48 of 48 on the 12th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 16493 s" }, { "step": "ruling", "text": "Dāmodara Dvādaśī, Cairo, 1981: Wednesday 12 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "damodara-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Buddha dvadasi, Damodara dvadasi (purvaviddha), Visnu-pavitraropana." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-12", "confidence": "determinate" } ], "quote": "In Cairo, Dāmodara Dvādaśī 1981 falls on Wednesday 12 August. Dvādaśī runs from 17:59 on Tue 11 Aug to 19:17 on Wed 12 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/damodara-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-08-12", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-12", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 1304, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-08-12T19:17:19+03:00", "utc": "1981-08-12T16:17:19Z", "ms": 366481039001.4711 }, "end": { "local": "1981-08-13T20:00:14+03:00", "utc": "1981-08-13T17:00:14Z", "ms": 366570014091.72876 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-12T19:17:19+03:00", "utc": "1981-08-12T16:17:19Z", "ms": 366481039001.4711 }, "end": { "local": "1981-08-13T20:00:14+03:00", "utc": "1981-08-13T17:00:14Z", "ms": 366570014091.72876 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-08-12", "window": { "start": { "local": "1981-08-12T19:39:03+03:00", "utc": "1981-08-12T16:39:03Z", "ms": 366482342967.9286 }, "end": { "local": "1981-08-12T21:04:39+03:00", "utc": "1981-08-12T18:04:39Z", "ms": 366487479224.61304 } }, "covered_min": 86, "window_min": 86, "qualifies": true }, { "local_date": "1981-08-13", "window": { "start": { "local": "1981-08-13T19:38:06+03:00", "utc": "1981-08-13T16:38:06Z", "ms": 366568686268.81335 }, "end": { "local": "1981-08-13T21:03:55+03:00", "utc": "1981-08-13T18:03:55Z", "ms": 366573834808.0678 } }, "covered_min": 22, "window_min": 86, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 19:17 on Wed 12 Aug to 20:00 on Thu 13 Aug.", "fact": "1981-08-12T16:17:19Z → 1981-08-13T17:00:14Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:39–21:05 on the 12th, 19:38–21:04 on the 13th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 86 of 86 minutes on the 12th and 22 of 86 on the 13th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Both evenings qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 1304 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Wednesday 12 August.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-12", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-12", "confidence": "boundary" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Wednesday 12 August. Trayodaśī runs from 19:17 on Wed 12 Aug to 20:00 on Thu 13 Aug and covers all of pradoṣa that evening. It also reaches the next evening for 22 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-08-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/raksha-bandhana", "festival": "raksha-bandhana", "name": "Rakṣā Bandhana", "everyday": "Rakhi", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5602, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-08-14T20:06:09+03:00", "utc": "1981-08-14T17:06:09Z", "ms": 366656769467.0725 }, "end": { "local": "1981-08-15T19:36:37+03:00", "utc": "1981-08-15T16:36:37Z", "ms": 366741397298.87384 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "second-half", "start": { "local": "1981-08-15T07:55:38+03:00", "utc": "1981-08-15T04:55:38Z", "ms": 366699337931.54834 }, "end": { "local": "1981-08-15T19:36:37+03:00", "utc": "1981-08-15T16:36:37Z", "ms": 366741397298.87384 } }, "kaala": "day", "days": [ { "local_date": "1981-08-14", "window": { "start": { "local": "1981-08-14T06:21:40+03:00", "utc": "1981-08-14T03:21:40Z", "ms": 366607300313.2218 }, "end": { "local": "1981-08-15T06:22:16+03:00", "utc": "1981-08-15T03:22:16Z", "ms": 366693735599.8495 } }, "covered_min": 0, "window_min": 1441, "qualifies": false }, { "local_date": "1981-08-15", "window": { "start": { "local": "1981-08-15T06:22:16+03:00", "utc": "1981-08-15T03:22:16Z", "ms": 366693735599.8495 }, "end": { "local": "1981-08-16T06:22:51+03:00", "utc": "1981-08-16T03:22:51Z", "ms": 366780170751.7593 } }, "covered_min": 701, "window_min": 1441, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 20:06 on Fri 14 Aug to 19:37 on Sat 15 Aug. Its second half begins at 07:56 on Sat 15 Aug.", "fact": "1981-08-14T17:06:09Z → 1981-08-15T16:36:37Z · second half from 1981-08-15T04:55:38Z" }, { "step": "kaala", "text": "The day runs from sunrise to the next sunrise: from 06:22 on the 14th, and from 06:22 on the 15th.", "fact": "day: sunrise-to-sunrise · sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "The second half of Pūrṇimā must be present during the day. It covers 0 of 1441 minutes on the 14th and 701 of 1441 on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one day qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 5602 s" }, { "step": "ruling", "text": "Rakṣā Bandhana, Cairo, 1981: Saturday 15 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "raksha-bandhana", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Rakhi purnima, Naroli purnima (Cocoanut day), Raksa Bandhana (in the second half of purnima), Rsi tarpana (madhyahna vyapini), Hayagriva utpatti, Jhulanayatra samapana" } ], "kaala": "day", "priority": "unstated", "when_absent": "unstated", "half": "second" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-15", "confidence": "determinate" } ], "quote": "In Cairo, Rakṣā Bandhana (Rakhi) 1981 falls on Saturday 15 August. The second half of Pūrṇimā runs from 07:56 on Sat 15 Aug to 19:37 on Sat 15 Aug and lies within that day, sunrise to sunrise.", "cite": "https://ahargana.org/cairo/festivals/1981/raksha-bandhana", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rishi-tarpana", "festival": "rishi-tarpana", "name": "Ṛṣi Tarpaṇa", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22405, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-08-14T20:06:09+03:00", "utc": "1981-08-14T17:06:09Z", "ms": 366656769467.0725 }, "end": { "local": "1981-08-15T19:36:37+03:00", "utc": "1981-08-15T16:36:37Z", "ms": 366741397298.87384 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "1981-08-14T20:06:09+03:00", "utc": "1981-08-14T17:06:09Z", "ms": 366656769467.0725 }, "end": { "local": "1981-08-15T19:36:37+03:00", "utc": "1981-08-15T16:36:37Z", "ms": 366741397298.87384 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-14", "window": { "start": { "local": "1981-08-14T12:35:24+03:00", "utc": "1981-08-14T09:35:24Z", "ms": 366629724455.04816 }, "end": { "local": "1981-08-14T13:23:24+03:00", "utc": "1981-08-14T10:23:24Z", "ms": 366632604455.04816 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-08-15", "window": { "start": { "local": "1981-08-15T12:35:13+03:00", "utc": "1981-08-15T09:35:13Z", "ms": 366716112789.6515 }, "end": { "local": "1981-08-15T13:23:13+03:00", "utc": "1981-08-15T10:23:13Z", "ms": 366718992789.6515 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 20:06 on Fri 14 Aug to 19:37 on Sat 15 Aug.", "fact": "1981-08-14T17:06:09Z → 1981-08-15T16:36:37Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:35–13:23 on the 14th, 12:35–13:23 on the 15th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 0 of 48 minutes on the 14th and 48 of 48 on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 22405 s" }, { "step": "ruling", "text": "Ṛṣi Tarpaṇa, Cairo, 1981: Saturday 15 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rishi-tarpana", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Rakhi purnima, Naroli purnima (Cocoanut day), Raksa Bandhana (in the second half of purnima), Rsi tarpana (madhyahna vyapini), Hayagriva utpatti, Jhulanayatra samapana" } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-15", "confidence": "determinate" } ], "quote": "In Cairo, Ṛṣi Tarpaṇa 1981 falls on Saturday 15 August. Pūrṇimā runs from 20:06 on Fri 14 Aug to 19:37 on Sat 15 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rishi-tarpana", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ashunya-shayana-vrata", "festival": "ashunya-shayana-vrata", "name": "Aśūnya Śayana Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6476, "anga": { "type": "tithi", "index": 16, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "1981-08-16T18:35:19+03:00", "utc": "1981-08-16T15:35:19Z", "ms": 366824119214.3267 }, "end": { "local": "1981-08-17T17:07:19+03:00", "utc": "1981-08-17T14:07:19Z", "ms": 366905238745.8564 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-16T18:35:19+03:00", "utc": "1981-08-16T15:35:19Z", "ms": 366824119214.3267 }, "end": { "local": "1981-08-17T17:07:19+03:00", "utc": "1981-08-17T14:07:19Z", "ms": 366905238745.8564 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-08-16", "window": { "start": { "local": "1981-08-16T20:23:15+03:00", "utc": "1981-08-16T17:23:15Z", "ms": 366830594865.7563 }, "end": { "local": "1981-08-16T20:23:15+03:00", "utc": "1981-08-16T17:23:15Z", "ms": 366830594865.7563 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-08-17", "window": { "start": { "local": "1981-08-17T21:02:35+03:00", "utc": "1981-08-17T18:02:35Z", "ms": 366919355064.5074 }, "end": { "local": "1981-08-17T21:02:35+03:00", "utc": "1981-08-17T18:02:35Z", "ms": 366919355064.5074 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 18:35 on Sun 16 Aug to 17:07 on Mon 17 Aug.", "fact": "1981-08-16T15:35:19Z → 1981-08-17T14:07:19Z" }, { "step": "kaala", "text": "Moonrise is at 20:23 on the 16th and 21:03 on the 17th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Dvitīyā must be current at moonrise. It is on the 16th and is not on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 6476 s" }, { "step": "ruling", "text": "Aśūnya Śayana Vrata, Cairo, 1981: Sunday 16 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ashunya-shayana-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 2 Asunyasayana vrata (Dvitiya current at moonrise; if occurs on two successive days, it is to be observed on the second day)." } ], "kaala": "moonrise", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-16", "confidence": "determinate" } ], "quote": "In Cairo, Aśūnya Śayana Vrata 1981 falls on Sunday 16 August. Dvitīyā runs from 18:35 on Sun 16 Aug to 17:07 on Mon 17 Aug and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ashunya-shayana-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/kajjali-tritiya", "festival": "kajjali-tritiya", "name": "Kajjalī Tṛtīyā", "everyday": "Kajari Teej", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6945, "anga": { "type": "tithi", "index": 17, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-08-17T17:07:19+03:00", "utc": "1981-08-17T14:07:19Z", "ms": 366905238745.8564 }, "end": { "local": "1981-08-18T15:18:20+03:00", "utc": "1981-08-18T12:18:20Z", "ms": 366985099831.8458 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-17T17:07:19+03:00", "utc": "1981-08-17T14:07:19Z", "ms": 366905238745.8564 }, "end": { "local": "1981-08-18T15:18:20+03:00", "utc": "1981-08-18T12:18:20Z", "ms": 366985099831.8458 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-17", "window": { "start": { "local": "1981-08-17T12:34:48+03:00", "utc": "1981-08-17T09:34:48Z", "ms": 366888887894.3692 }, "end": { "local": "1981-08-17T13:22:48+03:00", "utc": "1981-08-17T10:22:48Z", "ms": 366891767894.3692 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-08-18", "window": { "start": { "local": "1981-08-18T12:34:35+03:00", "utc": "1981-08-18T09:34:35Z", "ms": 366975274693.47314 }, "end": { "local": "1981-08-18T13:22:35+03:00", "utc": "1981-08-18T10:22:35Z", "ms": 366978154693.47314 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 17:07 on Mon 17 Aug to 15:18 on Tue 18 Aug.", "fact": "1981-08-17T14:07:19Z → 1981-08-18T12:18:20Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:35–13:23 on the 17th, 12:35–13:23 on the 18th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during madhyāhna. It covers 0 of 48 minutes on the 17th and 48 of 48 on the 18th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 6945 s" }, { "step": "ruling", "text": "Kajjalī Tṛtīyā, Cairo, 1981: Tuesday 18 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "kajjali-tritiya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 3 Kajjali trtiya, (paraviddha), Angaveta trtiya (Orissa)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-18", "confidence": "determinate" } ], "quote": "In Cairo, Kajjalī Tṛtīyā (Kajari Teej) 1981 falls on Tuesday 18 August. Tṛtīyā runs from 17:07 on Mon 17 Aug to 15:18 on Tue 18 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/kajjali-tritiya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/bahula-chaturthi", "festival": "bahula-chaturthi", "name": "Bahulā Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5819, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-08-18T15:18:20+03:00", "utc": "1981-08-18T12:18:20Z", "ms": 366985099831.8458 }, "end": { "local": "1981-08-19T13:14:14+03:00", "utc": "1981-08-19T10:14:14Z", "ms": 367064053604.26855 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-18T15:18:20+03:00", "utc": "1981-08-18T12:18:20Z", "ms": 366985099831.8458 }, "end": { "local": "1981-08-19T13:14:14+03:00", "utc": "1981-08-19T10:14:14Z", "ms": 367064053604.26855 } }, "kaala": "sayahna", "days": [ { "local_date": "1981-08-18", "window": { "start": { "local": "1981-08-18T16:55:19+03:00", "utc": "1981-08-18T13:55:19Z", "ms": 366990919117.20526 }, "end": { "local": "1981-08-18T19:33:09+03:00", "utc": "1981-08-18T16:33:09Z", "ms": 367000388733.0267 } }, "covered_min": 158, "window_min": 158, "qualifies": true }, { "local_date": "1981-08-19", "window": { "start": { "local": "1981-08-19T16:54:36+03:00", "utc": "1981-08-19T13:54:36Z", "ms": 367077276371.9974 }, "end": { "local": "1981-08-19T19:32:07+03:00", "utc": "1981-08-19T16:32:07Z", "ms": 367086726612.9627 } }, "covered_min": 0, "window_min": 158, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 15:18 on Tue 18 Aug to 13:14 on Wed 19 Aug.", "fact": "1981-08-18T12:18:20Z → 1981-08-19T10:14:14Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 16:55–19:33 on the 18th, 16:55–19:32 on the 19th.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during sāyāhna. It covers 158 of 158 minutes on the 18th and 0 of 158 on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one late afternoon qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 5819 s" }, { "step": "ruling", "text": "Bahulā Caturthī, Cairo, 1981: Tuesday 18 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "bahula-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 4 Bahula caturthi (Madhyadesa) (Sayahnavyapini: if occurs on two successive days, it is to be observed on the 1st day)." } ], "kaala": "sayahna", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-18", "confidence": "determinate" } ], "quote": "In Cairo, Bahulā Caturthī 1981 falls on Tuesday 18 August. Caturthī runs from 15:18 on Tue 18 Aug to 13:14 on Wed 19 Aug and covers all of sāyāhna that late afternoon.", "cite": "https://ahargana.org/cairo/festivals/1981/bahula-chaturthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-08-18", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22939, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-08-18T15:18:20+03:00", "utc": "1981-08-18T12:18:20Z", "ms": 366985099831.8458 }, "end": { "local": "1981-08-19T13:14:14+03:00", "utc": "1981-08-19T10:14:14Z", "ms": 367064053604.26855 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-18T15:18:20+03:00", "utc": "1981-08-18T12:18:20Z", "ms": 366985099831.8458 }, "end": { "local": "1981-08-19T13:14:14+03:00", "utc": "1981-08-19T10:14:14Z", "ms": 367064053604.26855 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-08-18", "window": { "start": { "local": "1981-08-18T21:40:39+03:00", "utc": "1981-08-18T18:40:39Z", "ms": 367008038961.7872 }, "end": { "local": "1981-08-18T21:40:39+03:00", "utc": "1981-08-18T18:40:39Z", "ms": 367008038961.7872 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-08-19", "window": { "start": { "local": "1981-08-19T22:18:32+03:00", "utc": "1981-08-19T19:18:32Z", "ms": 367096712105.4541 }, "end": { "local": "1981-08-19T22:18:32+03:00", "utc": "1981-08-19T19:18:32Z", "ms": 367096712105.4541 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 15:18 on Tue 18 Aug to 13:14 on Wed 19 Aug.", "fact": "1981-08-18T12:18:20Z → 1981-08-19T10:14:14Z" }, { "step": "kaala", "text": "Moonrise is at 21:41 on the 18th and 22:19 on the 19th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 18th and is not on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 22939 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Tuesday 18 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-18", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Tuesday 18 August. Caturthī runs from 15:18 on Tue 18 Aug to 13:14 on Wed 19 Aug and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-08-18", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/hala-shashthi", "festival": "hala-shashthi", "name": "Hala Ṣaṣṭhī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5613, "anga": { "type": "tithi", "index": 20, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-08-20T11:00:34+03:00", "utc": "1981-08-20T08:00:34Z", "ms": 367142433638.81696 }, "end": { "local": "1981-08-21T08:42:19+03:00", "utc": "1981-08-21T05:42:19Z", "ms": 367220539318.8948 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-20T11:00:34+03:00", "utc": "1981-08-20T08:00:34Z", "ms": 367142433638.81696 }, "end": { "local": "1981-08-21T08:42:19+03:00", "utc": "1981-08-21T05:42:19Z", "ms": 367220539318.8948 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-20", "window": { "start": { "local": "1981-08-20T12:34:07+03:00", "utc": "1981-08-20T09:34:07Z", "ms": 367148046860.85657 }, "end": { "local": "1981-08-20T13:22:07+03:00", "utc": "1981-08-20T10:22:07Z", "ms": 367150926860.85657 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-08-21", "window": { "start": { "local": "1981-08-21T12:33:52+03:00", "utc": "1981-08-21T09:33:52Z", "ms": 367234432259.39526 }, "end": { "local": "1981-08-21T13:21:52+03:00", "utc": "1981-08-21T10:21:52Z", "ms": 367237312259.39526 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 11:01 on Thu 20 Aug to 08:42 on Fri 21 Aug.", "fact": "1981-08-20T08:00:34Z → 1981-08-21T05:42:19Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:34–13:22 on the 20th, 12:34–13:22 on the 21st.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 20th and 0 of 48 on the 21st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 5613 s" }, { "step": "ruling", "text": "Hala Ṣaṣṭhī, Cairo, 1981: Thursday 20 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "hala-shashthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 6 Hala sasthi (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-20", "confidence": "determinate" } ], "quote": "In Cairo, Hala Ṣaṣṭhī 1981 falls on Thursday 20 August. Ṣaṣṭhī runs from 11:01 on Thu 20 Aug to 08:42 on Fri 21 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/hala-shashthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shitala-saptami", "festival": "shitala-saptami", "name": "Śītalā Saptamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13893, "anga": { "type": "tithi", "index": 21, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-08-21T08:42:19+03:00", "utc": "1981-08-21T05:42:19Z", "ms": 367220539318.8948 }, "end": { "local": "1981-08-22T06:23:47+03:00", "utc": "1981-08-22T03:23:47Z", "ms": 367298627150.3977 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-21T08:42:19+03:00", "utc": "1981-08-21T05:42:19Z", "ms": 367220539318.8948 }, "end": { "local": "1981-08-22T06:23:47+03:00", "utc": "1981-08-22T03:23:47Z", "ms": 367298627150.3977 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-21", "window": { "start": { "local": "1981-08-21T12:33:52+03:00", "utc": "1981-08-21T09:33:52Z", "ms": 367234432259.39526 }, "end": { "local": "1981-08-21T13:21:52+03:00", "utc": "1981-08-21T10:21:52Z", "ms": 367237312259.39526 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-08-22", "window": { "start": { "local": "1981-08-22T12:33:37+03:00", "utc": "1981-08-22T09:33:37Z", "ms": 367320817220.63635 }, "end": { "local": "1981-08-22T13:21:37+03:00", "utc": "1981-08-22T10:21:37Z", "ms": 367323697220.63635 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 08:42 on Fri 21 Aug to 06:24 on Sat 22 Aug.", "fact": "1981-08-21T05:42:19Z → 1981-08-22T03:23:47Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:34–13:22 on the 21st, 12:34–13:22 on the 22nd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during madhyāhna. It covers 48 of 48 minutes on the 21st and 0 of 48 on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 13893 s" }, { "step": "ruling", "text": "Śītalā Saptamī, Cairo, 1981: Friday 21 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shitala-saptami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 7 Sitala saptami (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-21", "confidence": "determinate" } ], "quote": "In Cairo, Śītalā Saptamī 1981 falls on Friday 21 August. Saptamī runs from 08:42 on Fri 21 Aug to 06:24 on Sat 22 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/shitala-saptami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/janmashtami", "festival": "janmashtami", "name": "Janmāṣṭamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9996, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-08-22T06:23:47+03:00", "utc": "1981-08-22T03:23:47Z", "ms": 367298627150.3977 }, "end": { "local": "1981-08-23T04:08:30+03:00", "utc": "1981-08-23T01:08:30Z", "ms": 367376910033.1884 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-22T06:23:47+03:00", "utc": "1981-08-22T03:23:47Z", "ms": 367298627150.3977 }, "end": { "local": "1981-08-23T04:08:30+03:00", "utc": "1981-08-23T01:08:30Z", "ms": 367376910033.1884 } }, "kaala": "nishita", "days": [ { "local_date": "1981-08-21", "window": { "start": { "local": "1981-08-22T00:34:09+03:00", "utc": "1981-08-21T21:34:09Z", "ms": 367277649448.8766 }, "end": { "local": "1981-08-22T01:22:09+03:00", "utc": "1981-08-21T22:22:09Z", "ms": 367280529448.8766 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-08-22", "window": { "start": { "local": "1981-08-23T00:33:54+03:00", "utc": "1981-08-22T21:33:54Z", "ms": 367364034349.52386 }, "end": { "local": "1981-08-23T01:21:54+03:00", "utc": "1981-08-22T22:21:54Z", "ms": 367366914349.52386 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 06:24 on Sat 22 Aug to 04:09 on Sun 23 Aug.", "fact": "1981-08-22T03:23:47Z → 1981-08-23T01:08:30Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:34–01:22 on the 21st, 00:34–01:22 on the 22nd.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during niśītha. It covers 0 of 48 minutes on the 21st and 48 of 48 on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 9996 s" }, { "step": "ruling", "text": "Janmāṣṭamī, Cairo, 1981: Saturday 22 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "janmashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 8 Janmastami (madhyaratra-vyapini), if midnight is covered on two days, or not on any day, it is to be observed on the 2nd day; special when combined with naksatra 'Rohini' at midnight, more so when on Monday or Wednesday. If the combination occurs before midnight and 'Rohini' extends up to midnight, it is to be observed on that day. Gokulastami." } ], "not_evaluated": "The clauses on Rohiṇī nakṣatra, the Vaiṣṇava observance on the day after saptamī, and the Assam and South India reckoning in the solar month belong to other readings and are not applied.", "kaala": "nishita", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-22", "confidence": "determinate" } ], "quote": "In Cairo, Janmāṣṭamī 1981 falls on Saturday 22 August. Aṣṭamī runs from 06:24 on Sat 22 Aug to 04:09 on Sun 23 Aug and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/janmashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-08-25", "festival": "ekadashi", "name": "Ajā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23339, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-08-24T23:59:02+03:00", "utc": "1981-08-24T20:59:02Z", "ms": 367534742357.5245 }, "end": { "local": "1981-08-25T22:09:51+03:00", "utc": "1981-08-25T19:09:51Z", "ms": 367614591052.00726 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-24T23:59:02+03:00", "utc": "1981-08-24T20:59:02Z", "ms": 367534742357.5245 }, "end": { "local": "1981-08-25T22:09:51+03:00", "utc": "1981-08-25T19:09:51Z", "ms": 367614591052.00726 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-08-25", "window": { "start": { "local": "1981-08-25T06:28:01+03:00", "utc": "1981-08-25T03:28:01Z", "ms": 367558081327.08405 }, "end": { "local": "1981-08-25T06:28:01+03:00", "utc": "1981-08-25T03:28:01Z", "ms": 367558081327.08405 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-08-26", "window": { "start": { "local": "1981-08-26T06:28:35+03:00", "utc": "1981-08-26T03:28:35Z", "ms": 367644515222.6181 }, "end": { "local": "1981-08-26T06:28:35+03:00", "utc": "1981-08-26T03:28:35Z", "ms": 367644515222.6181 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 23:59 on Mon 24 Aug to 22:10 on Tue 25 Aug.", "fact": "1981-08-24T20:59:02Z → 1981-08-25T19:09:51Z" }, { "step": "kaala", "text": "Sunrise is at 06:28 on the 25th and 06:29 on the 26th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 25th and is not on the 26th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 23339 s" }, { "step": "ruling", "text": "Ajā Ekādaśī, Cairo, 1981: Tuesday 25 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-25", "confidence": "determinate" } ], "quote": "In Cairo, Ajā Ekādaśī 1981 falls on Tuesday 25 August. Ekādaśī runs from 23:59 on Mon 24 Aug to 22:10 on Tue 25 Aug and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-08-25", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-08-26", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 450, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-08-26T20:34:27+03:00", "utc": "1981-08-26T17:34:27Z", "ms": 367695267497.39154 }, "end": { "local": "1981-08-27T19:15:53+03:00", "utc": "1981-08-27T16:15:53Z", "ms": 367776952548.84796 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-26T20:34:27+03:00", "utc": "1981-08-26T17:34:27Z", "ms": 367695267497.39154 }, "end": { "local": "1981-08-27T19:15:53+03:00", "utc": "1981-08-27T16:15:53Z", "ms": 367776952548.84796 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-08-26", "window": { "start": { "local": "1981-08-26T19:24:31+03:00", "utc": "1981-08-26T16:24:31Z", "ms": 367691070689.2914 }, "end": { "local": "1981-08-26T20:53:08+03:00", "utc": "1981-08-26T17:53:08Z", "ms": 367696387796.8674 } }, "covered_min": 19, "window_min": 89, "qualifies": true }, { "local_date": "1981-08-27", "window": { "start": { "local": "1981-08-27T19:23:23+03:00", "utc": "1981-08-27T16:23:23Z", "ms": 367777402847.8788 }, "end": { "local": "1981-08-27T20:52:13+03:00", "utc": "1981-08-27T17:52:13Z", "ms": 367782733487.7313 } }, "covered_min": 0, "window_min": 89, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 20:34 on Wed 26 Aug to 19:16 on Thu 27 Aug.", "fact": "1981-08-26T17:34:27Z → 1981-08-27T16:15:53Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:25–20:53 on the 26th, 19:23–20:52 on the 27th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 19 of 89 minutes on the 26th and 0 of 89 on the 27th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 450 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Wednesday 26 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-26", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-26", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Wednesday 26 August. Trayodaśī runs from 20:34 on Wed 26 Aug to 19:16 on Thu 27 Aug and covers 19 of 89 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-08-26", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/aghora-chaturdashi", "festival": "aghora-chaturdashi", "name": "Aghora Caturdaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 450, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-08-27T19:15:53+03:00", "utc": "1981-08-27T16:15:53Z", "ms": 367776952548.84796 }, "end": { "local": "1981-08-28T18:17:35+03:00", "utc": "1981-08-28T15:17:35Z", "ms": 367859855092.6528 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-27T19:15:53+03:00", "utc": "1981-08-27T16:15:53Z", "ms": 367776952548.84796 }, "end": { "local": "1981-08-28T18:17:35+03:00", "utc": "1981-08-28T15:17:35Z", "ms": 367859855092.6528 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-08-27", "window": { "start": { "local": "1981-08-27T19:23:23+03:00", "utc": "1981-08-27T16:23:23Z", "ms": 367777402847.8788 }, "end": { "local": "1981-08-27T20:52:13+03:00", "utc": "1981-08-27T17:52:13Z", "ms": 367782733487.7313 } }, "covered_min": 89, "window_min": 89, "qualifies": true }, { "local_date": "1981-08-28", "window": { "start": { "local": "1981-08-28T19:22:14+03:00", "utc": "1981-08-28T16:22:14Z", "ms": 367863734399.65466 }, "end": { "local": "1981-08-28T20:51:19+03:00", "utc": "1981-08-28T17:51:19Z", "ms": 367869078636.2637 } }, "covered_min": 0, "window_min": 89, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 19:16 on Thu 27 Aug to 18:18 on Fri 28 Aug.", "fact": "1981-08-27T16:15:53Z → 1981-08-28T15:17:35Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:23–20:52 on the 27th, 19:22–20:51 on the 28th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during pradoṣa. It covers 89 of 89 minutes on the 27th and 0 of 89 on the 28th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 450 s" }, { "step": "ruling", "text": "Aghora Caturdaśī, Cairo, 1981: Thursday 27 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "aghora-chaturdashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 14 Aghora caturdasi (pradosa vyapini)." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-27", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-27", "confidence": "determinate" } ], "quote": "In Cairo, Aghora Caturdaśī 1981 falls on Thursday 27 August. Caturdaśī runs from 19:16 on Thu 27 Aug to 18:18 on Fri 28 Aug and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/aghora-chaturdashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-08-27", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 19000, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-08-27T19:15:53+03:00", "utc": "1981-08-27T16:15:53Z", "ms": 367776952548.84796 }, "end": { "local": "1981-08-28T18:17:35+03:00", "utc": "1981-08-28T15:17:35Z", "ms": 367859855092.6528 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-27T19:15:53+03:00", "utc": "1981-08-27T16:15:53Z", "ms": 367776952548.84796 }, "end": { "local": "1981-08-28T18:17:35+03:00", "utc": "1981-08-28T15:17:35Z", "ms": 367859855092.6528 } }, "kaala": "nishita", "days": [ { "local_date": "1981-08-27", "window": { "start": { "local": "1981-08-28T00:32:33+03:00", "utc": "1981-08-27T21:32:33Z", "ms": 367795952747.32574 }, "end": { "local": "1981-08-28T01:20:33+03:00", "utc": "1981-08-27T22:20:33Z", "ms": 367798832747.32574 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-08-28", "window": { "start": { "local": "1981-08-29T00:32:15+03:00", "utc": "1981-08-28T21:32:15Z", "ms": 367882335286.93854 }, "end": { "local": "1981-08-29T01:20:15+03:00", "utc": "1981-08-28T22:20:15Z", "ms": 367885215286.93854 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 19:16 on Thu 27 Aug to 18:18 on Fri 28 Aug.", "fact": "1981-08-27T16:15:53Z → 1981-08-28T15:17:35Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:33–01:21 on the 27th, 00:32–01:20 on the 28th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 27th and 0 of 48 on the 28th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 19000 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Thursday 27 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-27", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Thursday 27 August. Caturdaśī runs from 19:16 on Thu 27 Aug to 18:18 on Fri 28 Aug and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-08-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rudra-vrata", "festival": "rudra-vrata", "name": "Rudra Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-08-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15467, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-08-29T17:43:25+03:00", "utc": "1981-08-29T14:43:25Z", "ms": 367944204680.5984 }, "end": { "local": "1981-08-30T17:37:10+03:00", "utc": "1981-08-30T14:37:10Z", "ms": 368030230044.1023 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-29T17:43:25+03:00", "utc": "1981-08-29T14:43:25Z", "ms": 367944204680.5984 }, "end": { "local": "1981-08-30T17:37:10+03:00", "utc": "1981-08-30T14:37:10Z", "ms": 368030230044.1023 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-29", "window": { "start": { "local": "1981-08-29T12:31:41+03:00", "utc": "1981-08-29T09:31:41Z", "ms": 367925500770.719 }, "end": { "local": "1981-08-29T13:19:41+03:00", "utc": "1981-08-29T10:19:41Z", "ms": 367928380770.719 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-08-30", "window": { "start": { "local": "1981-08-30T12:31:23+03:00", "utc": "1981-08-30T09:31:23Z", "ms": 368011882676.05554 }, "end": { "local": "1981-08-30T13:19:23+03:00", "utc": "1981-08-30T10:19:23Z", "ms": 368014762676.05554 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 17:43 on Sat 29 Aug to 17:37 on Sun 30 Aug.", "fact": "1981-08-29T14:43:25Z → 1981-08-30T14:37:10Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 29th, 12:31–13:19 on the 30th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during madhyāhna. It covers 0 of 48 minutes on the 29th and 48 of 48 on the 30th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 15467 s" }, { "step": "ruling", "text": "Rudra Vrata, Cairo, 1981: Sunday 30 August.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rudra-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 1 Rudra vrata (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-08-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-08-30", "confidence": "determinate" } ], "quote": "In Cairo, Rudra Vrata 1981 falls on Sunday 30 August. Pratipadā runs from 17:43 on Sat 29 Aug to 17:37 on Sun 30 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rudra-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/haritalika-vrata", "festival": "haritalika-vrata", "name": "Haritālikā Vrata", "everyday": "Hartalika Teej", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16978, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "1981-08-31T18:02:03+03:00", "utc": "1981-08-31T15:02:03Z", "ms": 368118122533.92944 }, "end": { "local": "1981-09-01T18:59:46+03:00", "utc": "1981-09-01T15:59:46Z", "ms": 368207985891.4933 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-08-31T18:02:03+03:00", "utc": "1981-08-31T15:02:03Z", "ms": 368118122533.92944 }, "end": { "local": "1981-09-01T18:59:46+03:00", "utc": "1981-09-01T15:59:46Z", "ms": 368207985891.4933 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-08-31", "window": { "start": { "local": "1981-08-31T12:31:04+03:00", "utc": "1981-08-31T09:31:04Z", "ms": 368098264251.42786 }, "end": { "local": "1981-08-31T13:19:04+03:00", "utc": "1981-08-31T10:19:04Z", "ms": 368101144251.42786 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-09-01", "window": { "start": { "local": "1981-09-01T12:30:46+03:00", "utc": "1981-09-01T09:30:46Z", "ms": 368184645510.011 }, "end": { "local": "1981-09-01T13:18:46+03:00", "utc": "1981-09-01T10:18:46Z", "ms": 368187525510.011 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 18:02 on Mon 31 Aug to 19:00 on Tue 1 Sep.", "fact": "1981-08-31T15:02:03Z → 1981-09-01T15:59:46Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:31–13:19 on the 31st, 12:31–13:19 on the 1st.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during madhyāhna. It covers 0 of 48 minutes on the 31st and 48 of 48 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 16978 s" }, { "step": "ruling", "text": "Haritālikā Vrata, Cairo, 1981: Tuesday 1 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "haritalika-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 3 Haritalika vrata (paraviddha), Gauri vrata (Orissa), Gauri (Mysore)" } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-01", "confidence": "determinate" } ], "quote": "In Cairo, Haritālikā Vrata (Hartalika Teej) 1981 falls on Tuesday 1 September. Tṛtīyā runs from 18:02 on Mon 31 Aug to 19:00 on Tue 1 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/haritalika-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ganesha-chaturthi", "festival": "ganesha-chaturthi", "name": "Gaṇeśa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20460, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-09-01T18:59:46+03:00", "utc": "1981-09-01T15:59:46Z", "ms": 368207985891.4933 }, "end": { "local": "1981-09-02T20:29:38+03:00", "utc": "1981-09-02T17:29:38Z", "ms": 368299778069.4927 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-01T18:59:46+03:00", "utc": "1981-09-01T15:59:46Z", "ms": 368207985891.4933 }, "end": { "local": "1981-09-02T20:29:38+03:00", "utc": "1981-09-02T17:29:38Z", "ms": 368299778069.4927 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-01", "window": { "start": { "local": "1981-09-01T12:30:46+03:00", "utc": "1981-09-01T09:30:46Z", "ms": 368184645510.011 }, "end": { "local": "1981-09-01T13:18:46+03:00", "utc": "1981-09-01T10:18:46Z", "ms": 368187525510.011 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-09-02", "window": { "start": { "local": "1981-09-02T12:30:26+03:00", "utc": "1981-09-02T09:30:26Z", "ms": 368271026465.74524 }, "end": { "local": "1981-09-02T13:18:26+03:00", "utc": "1981-09-02T10:18:26Z", "ms": 368273906465.74524 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 19:00 on Tue 1 Sep to 20:30 on Wed 2 Sep.", "fact": "1981-09-01T15:59:46Z → 1981-09-02T17:29:38Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:31–13:19 on the 1st, 12:30–13:18 on the 2nd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 1st and 48 of 48 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 20460 s" }, { "step": "ruling", "text": "Gaṇeśa Caturthī, Cairo, 1981: Wednesday 2 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ganesha-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 4 Varada caturthi (purvaviddha, madhyahnavyapini), Samvatsari parva (Jain-caturthi paksa), Saubhagya caturthi (Bengal), Ganesa caturthi (madhyahna vyapini and purvaviddha)" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-02", "confidence": "determinate" } ], "quote": "In Cairo, Gaṇeśa Caturthī 1981 falls on Wednesday 2 September. Caturthī runs from 19:00 on Tue 1 Sep to 20:30 on Wed 2 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/ganesha-chaturthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rishi-panchami", "festival": "rishi-panchami", "name": "Ṛṣi Pañcamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25872, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-09-02T20:29:38+03:00", "utc": "1981-09-02T17:29:38Z", "ms": 368299778069.4927 }, "end": { "local": "1981-09-03T22:27:37+03:00", "utc": "1981-09-03T19:27:37Z", "ms": 368393257437.3487 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-02T20:29:38+03:00", "utc": "1981-09-02T17:29:38Z", "ms": 368299778069.4927 }, "end": { "local": "1981-09-03T22:27:37+03:00", "utc": "1981-09-03T19:27:37Z", "ms": 368393257437.3487 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-02", "window": { "start": { "local": "1981-09-02T12:30:26+03:00", "utc": "1981-09-02T09:30:26Z", "ms": 368271026465.74524 }, "end": { "local": "1981-09-02T13:18:26+03:00", "utc": "1981-09-02T10:18:26Z", "ms": 368273906465.74524 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-09-03", "window": { "start": { "local": "1981-09-03T12:30:07+03:00", "utc": "1981-09-03T09:30:07Z", "ms": 368357407133.12085 }, "end": { "local": "1981-09-03T13:18:07+03:00", "utc": "1981-09-03T10:18:07Z", "ms": 368360287133.12085 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 20:30 on Wed 2 Sep to 22:28 on Thu 3 Sep.", "fact": "1981-09-02T17:29:38Z → 1981-09-03T19:27:37Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:30–13:18 on the 2nd, 12:30–13:18 on the 3rd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 0 of 48 minutes on the 2nd and 48 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: disputed → only-day · margin 25872 s" }, { "step": "ruling", "text": "Ṛṣi Pañcamī, Cairo, 1981: Thursday 3 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rishi-panchami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Rsi pancami (madhyahnavyapini) — If occurs on two successive days, it is to be observed according to Madhava on the 1st day and according to Hemadri and Divodasa on the 2nd day" } ], "kaala": "madhyahna", "priority": "disputed", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-03", "confidence": "determinate" } ], "quote": "In Cairo, Ṛṣi Pañcamī 1981 falls on Thursday 3 September. Pañcamī runs from 20:30 on Wed 2 Sep to 22:28 on Thu 3 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/rishi-panchami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/surya-shashthi-bhadrapada", "festival": "surya-shashthi-bhadrapada", "name": "Sūrya Ṣaṣṭhī (Bhādrapada)", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32970, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-09-03T22:27:37+03:00", "utc": "1981-09-03T19:27:37Z", "ms": 368393257437.3487 }, "end": { "local": "1981-09-05T00:45:53+03:00", "utc": "1981-09-04T21:45:53Z", "ms": 368487952691.1875 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-03T22:27:37+03:00", "utc": "1981-09-03T19:27:37Z", "ms": 368393257437.3487 }, "end": { "local": "1981-09-05T00:45:53+03:00", "utc": "1981-09-04T21:45:53Z", "ms": 368487952691.1875 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-03", "window": { "start": { "local": "1981-09-03T12:30:07+03:00", "utc": "1981-09-03T09:30:07Z", "ms": 368357407133.12085 }, "end": { "local": "1981-09-03T13:18:07+03:00", "utc": "1981-09-03T10:18:07Z", "ms": 368360287133.12085 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-09-04", "window": { "start": { "local": "1981-09-04T12:29:48+03:00", "utc": "1981-09-04T09:29:48Z", "ms": 368443787527.6947 }, "end": { "local": "1981-09-04T13:17:48+03:00", "utc": "1981-09-04T10:17:48Z", "ms": 368446667527.6947 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 22:28 on Thu 3 Sep to 00:46 on Sat 5 Sep.", "fact": "1981-09-03T19:27:37Z → 1981-09-04T21:45:53Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:30–13:18 on the 3rd, 12:30–13:18 on the 4th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 0 of 48 minutes on the 3rd and 48 of 48 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 32970 s" }, { "step": "ruling", "text": "Sūrya Ṣaṣṭhī (Bhādrapada), Cairo, 1981: Friday 4 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "surya-shashthi-bhadrapada", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 6 Surya sasthi (paraviddha), Lolarka sasthi" } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-04", "confidence": "determinate" } ], "quote": "In Cairo, Sūrya Ṣaṣṭhī (Bhādrapada) 1981 falls on Friday 4 September. Ṣaṣṭhī runs from 22:28 on Thu 3 Sep to 00:46 on Sat 5 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/surya-shashthi-bhadrapada", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/muktabharana-vrata", "festival": "muktabharana-vrata", "name": "Muktābharaṇa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33370, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-09-05T00:45:53+03:00", "utc": "1981-09-04T21:45:53Z", "ms": 368487952691.1875 }, "end": { "local": "1981-09-06T03:12:58+03:00", "utc": "1981-09-06T00:12:58Z", "ms": 368583177767.79974 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-05T00:45:53+03:00", "utc": "1981-09-04T21:45:53Z", "ms": 368487952691.1875 }, "end": { "local": "1981-09-06T03:12:58+03:00", "utc": "1981-09-06T00:12:58Z", "ms": 368583177767.79974 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-05", "window": { "start": { "local": "1981-09-05T12:29:28+03:00", "utc": "1981-09-05T09:29:28Z", "ms": 368530167665.7992 }, "end": { "local": "1981-09-05T13:17:28+03:00", "utc": "1981-09-05T10:17:28Z", "ms": 368533047665.7992 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-09-06", "window": { "start": { "local": "1981-09-06T12:29:08+03:00", "utc": "1981-09-06T09:29:08Z", "ms": 368616547564.4969 }, "end": { "local": "1981-09-06T13:17:08+03:00", "utc": "1981-09-06T10:17:08Z", "ms": 368619427564.4969 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 00:46 on Sat 5 Sep to 03:13 on Sun 6 Sep.", "fact": "1981-09-04T21:45:53Z → 1981-09-06T00:12:58Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 5th, 12:29–13:17 on the 6th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during madhyāhna. It covers 48 of 48 minutes on the 5th and 0 of 48 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 33370 s" }, { "step": "ruling", "text": "Muktābharaṇa Vrata, Cairo, 1981: Saturday 5 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "muktabharana-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 7 Muktabharana vrata (purvaviddha), Lalita saptami (Bengal & Orissa)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-05", "confidence": "determinate" } ], "quote": "In Cairo, Muktābharaṇa Vrata 1981 falls on Saturday 5 September. Saptamī runs from 00:46 on Sat 5 Sep to 03:13 on Sun 6 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/muktabharana-vrata", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/radhashtami", "festival": "radhashtami", "name": "Rādhāṣṭamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24824, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-09-06T03:12:58+03:00", "utc": "1981-09-06T00:12:58Z", "ms": 368583177767.79974 }, "end": { "local": "1981-09-07T05:35:04+03:00", "utc": "1981-09-07T02:35:04Z", "ms": 368678103500.8203 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-06T03:12:58+03:00", "utc": "1981-09-06T00:12:58Z", "ms": 368583177767.79974 }, "end": { "local": "1981-09-07T05:35:04+03:00", "utc": "1981-09-07T02:35:04Z", "ms": 368678103500.8203 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-06", "window": { "start": { "local": "1981-09-06T12:29:08+03:00", "utc": "1981-09-06T09:29:08Z", "ms": 368616547564.4969 }, "end": { "local": "1981-09-06T13:17:08+03:00", "utc": "1981-09-06T10:17:08Z", "ms": 368619427564.4969 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-09-07", "window": { "start": { "local": "1981-09-07T12:28:47+03:00", "utc": "1981-09-07T09:28:47Z", "ms": 368702927241.551 }, "end": { "local": "1981-09-07T13:16:47+03:00", "utc": "1981-09-07T10:16:47Z", "ms": 368705807241.551 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 03:13 on Sun 6 Sep to 05:35 on Mon 7 Sep.", "fact": "1981-09-06T00:12:58Z → 1981-09-07T02:35:04Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 6th, 12:29–13:17 on the 7th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 6th and 0 of 48 on the 7th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 24824 s" }, { "step": "ruling", "text": "Rādhāṣṭamī, Cairo, 1981: Sunday 6 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "radhashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini)" } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-06", "confidence": "determinate" } ], "quote": "In Cairo, Rādhāṣṭamī 1981 falls on Sunday 6 September. Aṣṭamī runs from 03:13 on Sun 6 Sep to 05:35 on Mon 7 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/radhashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-09-10", "festival": "ekadashi", "name": "Parivartanī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9171, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-09-09T09:09:09+03:00", "utc": "1981-09-09T06:09:09Z", "ms": 368863748879.2041 }, "end": { "local": "1981-09-10T09:59:49+03:00", "utc": "1981-09-10T06:59:49Z", "ms": 368953188643.5851 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-09T09:09:09+03:00", "utc": "1981-09-09T06:09:09Z", "ms": 368863748879.2041 }, "end": { "local": "1981-09-10T09:59:49+03:00", "utc": "1981-09-10T06:59:49Z", "ms": 368953188643.5851 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-09-09", "window": { "start": { "local": "1981-09-09T06:36:18+03:00", "utc": "1981-09-09T03:36:18Z", "ms": 368854577660.6599 }, "end": { "local": "1981-09-09T06:36:18+03:00", "utc": "1981-09-09T03:36:18Z", "ms": 368854577660.6599 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-09-10", "window": { "start": { "local": "1981-09-10T06:36:50+03:00", "utc": "1981-09-10T03:36:50Z", "ms": 368941010024.7175 }, "end": { "local": "1981-09-10T06:36:50+03:00", "utc": "1981-09-10T03:36:50Z", "ms": 368941010024.7175 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 09:09 on Wed 9 Sep to 10:00 on Thu 10 Sep.", "fact": "1981-09-09T06:09:09Z → 1981-09-10T06:59:49Z" }, { "step": "kaala", "text": "Sunrise is at 06:36 on the 9th and 06:37 on the 10th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 9th and is on the 10th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 9171 s" }, { "step": "ruling", "text": "Parivartanī Ekādaśī, Cairo, 1981: Thursday 10 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-10", "confidence": "determinate" } ], "quote": "In Cairo, Parivartanī Ekādaśī 1981 falls on Thursday 10 September. Ekādaśī runs from 09:09 on Wed 9 Sep to 10:00 on Thu 10 Sep and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-09-10", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vamana-jayanti", "festival": "vamana-jayanti", "name": "Vāmana Jayantī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8517, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-09-10T09:59:49+03:00", "utc": "1981-09-10T06:59:49Z", "ms": 368953188643.5851 }, "end": { "local": "1981-09-11T10:05:27+03:00", "utc": "1981-09-11T07:05:27Z", "ms": 369039927068.0516 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-10T09:59:49+03:00", "utc": "1981-09-10T06:59:49Z", "ms": 368953188643.5851 }, "end": { "local": "1981-09-11T10:05:27+03:00", "utc": "1981-09-11T07:05:27Z", "ms": 369039927068.0516 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-10", "window": { "start": { "local": "1981-09-10T12:27:45+03:00", "utc": "1981-09-10T09:27:45Z", "ms": 368962065131.08264 }, "end": { "local": "1981-09-10T13:15:45+03:00", "utc": "1981-09-10T10:15:45Z", "ms": 368964945131.08264 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-09-11", "window": { "start": { "local": "1981-09-11T12:27:24+03:00", "utc": "1981-09-11T09:27:24Z", "ms": 369048444113.6505 }, "end": { "local": "1981-09-11T13:15:24+03:00", "utc": "1981-09-11T10:15:24Z", "ms": 369051324113.6505 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 10:00 on Thu 10 Sep to 10:05 on Fri 11 Sep.", "fact": "1981-09-10T06:59:49Z → 1981-09-11T07:05:27Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 10th, 12:27–13:15 on the 11th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 10th and 0 of 48 on the 11th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 8517 s" }, { "step": "ruling", "text": "Vāmana Jayantī, Cairo, 1981: Thursday 10 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vamana-jayanti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Visnuparivartanotsava, Sakrotthana (in any of the naksatras U. Asadha, Sravana & Dhanistha), Kalki dvadasi, Sravana dvadasi (when combined with naksatra Sravana), Vamana jayanti (madhyahna vyapini)." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-10", "confidence": "determinate" } ], "quote": "In Cairo, Vāmana Jayantī 1981 falls on Thursday 10 September. Dvādaśī runs from 10:00 on Thu 10 Sep to 10:05 on Fri 11 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vamana-jayanti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-09-11", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32399, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-09-11T10:05:27+03:00", "utc": "1981-09-11T07:05:27Z", "ms": 369039927068.0516 }, "end": { "local": "1981-09-12T09:25:58+03:00", "utc": "1981-09-12T06:25:58Z", "ms": 369123958286.36127 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-11T10:05:27+03:00", "utc": "1981-09-11T07:05:27Z", "ms": 369039927068.0516 }, "end": { "local": "1981-09-12T09:25:58+03:00", "utc": "1981-09-12T06:25:58Z", "ms": 369123958286.36127 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-09-11", "window": { "start": { "local": "1981-09-11T19:05:26+03:00", "utc": "1981-09-11T16:05:26Z", "ms": 369072325878.66394 }, "end": { "local": "1981-09-11T20:37:46+03:00", "utc": "1981-09-11T17:37:46Z", "ms": 369077865714.3289 } }, "covered_min": 92, "window_min": 92, "qualifies": true }, { "local_date": "1981-09-12", "window": { "start": { "local": "1981-09-12T19:04:11+03:00", "utc": "1981-09-12T16:04:11Z", "ms": 369158651303.12115 }, "end": { "local": "1981-09-12T20:36:45+03:00", "utc": "1981-09-12T17:36:45Z", "ms": 369164205387.0153 } }, "covered_min": 0, "window_min": 93, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 10:05 on Fri 11 Sep to 09:26 on Sat 12 Sep.", "fact": "1981-09-11T07:05:27Z → 1981-09-12T06:25:58Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:05–20:38 on the 11th, 19:04–20:37 on the 12th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 92 of 92 minutes on the 11th and 0 of 93 on the 12th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 32399 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Friday 11 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-11", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Friday 11 September. Trayodaśī runs from 10:05 on Fri 11 Sep to 09:26 on Sat 12 Sep and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-09-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ananta-chaturdashi", "festival": "ananta-chaturdashi", "name": "Ananta Caturdaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-12", "confidence": "boundary", "boundary_reasons": [ "absent-unstated" ], "boundary_margin_s": 1128, "anga": { "type": "tithi", "index": 13, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-09-12T09:25:58+03:00", "utc": "1981-09-12T06:25:58Z", "ms": 369123958286.36127 }, "end": { "local": "1981-09-13T08:04:57+03:00", "utc": "1981-09-13T05:04:57Z", "ms": 369205497313.9881 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "1981-09-12T09:25:58+03:00", "utc": "1981-09-12T06:25:58Z", "ms": 369123958286.36127 }, "end": { "local": "1981-09-13T08:04:57+03:00", "utc": "1981-09-13T05:04:57Z", "ms": 369205497313.9881 } }, "kaala": "udaya-3", "days": [ { "local_date": "1981-09-12", "window": { "start": { "local": "1981-09-12T06:37:55+03:00", "utc": "1981-09-12T03:37:55Z", "ms": 369113874646.15137 }, "end": { "local": "1981-09-12T09:07:10+03:00", "utc": "1981-09-12T06:07:10Z", "ms": 369122829977.54535 } }, "covered_min": 0, "window_min": 149, "qualifies": false }, { "local_date": "1981-09-13", "window": { "start": { "local": "1981-09-13T06:38:27+03:00", "utc": "1981-09-13T03:38:27Z", "ms": 369200306932.3272 }, "end": { "local": "1981-09-13T09:07:21+03:00", "utc": "1981-09-13T06:07:21Z", "ms": 369209240854.14087 } }, "covered_min": 87, "window_min": 149, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 09:26 on Sat 12 Sep to 08:05 on Sun 13 Sep.", "fact": "1981-09-12T06:25:58Z → 1981-09-13T05:04:57Z" }, { "step": "kaala", "text": "The first three muhūrtas after sunrise is first 3 of 15 day muhūrtas: 06:38–09:07 on the 12th, 06:38–09:07 on the 13th.", "fact": "udaya-3: day-muhurta-1-3 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must hold through the first three muhūrtas after sunrise. It covers 0 of 149 minutes on the 12th and 87 of 149 on the 13th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Neither morning qualifies. The day the tithi falls on is taken.", "fact": "priority: unstated → tithi-day · margin 1128 s" }, { "step": "ruling", "text": "Ananta Caturdaśī, Cairo, 1981: Saturday 12 September.", "fact": "confidence: boundary (absent-unstated)" } ], "rule": { "kind": "lunar", "id": "ananta-chaturdashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 14 Ananta caturdasi (covering three muhurtas from sunrise, but one muhurta in Bengal)." } ], "not_evaluated": "In Bengal the row asks for one muhūrta from sunrise; that reading is not applied.", "kaala": "udaya-3", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-12", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-12", "confidence": "boundary" } ], "quote": "In Cairo, Ananta Caturdaśī 1981 falls on Saturday 12 September. Caturdaśī runs from 09:26 on Sat 12 Sep to 08:05 on Sun 13 Sep, and reaches the first three muhūrtas after sunrise on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/ananta-chaturdashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-09-16", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-16", "confidence": "boundary", "boundary_reasons": [ "absent-unstated" ], "boundary_margin_s": 4597, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-09-16T22:11:55+03:00", "utc": "1981-09-16T19:11:55Z", "ms": 369515514971.6247 }, "end": { "local": "1981-09-17T19:19:41+03:00", "utc": "1981-09-17T16:19:41Z", "ms": 369591581067.99927 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-16T22:11:55+03:00", "utc": "1981-09-16T19:11:55Z", "ms": 369515514971.6247 }, "end": { "local": "1981-09-17T19:19:41+03:00", "utc": "1981-09-17T16:19:41Z", "ms": 369591581067.99927 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-09-16", "window": { "start": { "local": "1981-09-16T20:55:18+03:00", "utc": "1981-09-16T17:55:18Z", "ms": 369510918274.1117 }, "end": { "local": "1981-09-16T20:55:18+03:00", "utc": "1981-09-16T17:55:18Z", "ms": 369510918274.1117 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-09-17", "window": { "start": { "local": "1981-09-17T21:36:38+03:00", "utc": "1981-09-17T18:36:38Z", "ms": 369599797602.6631 }, "end": { "local": "1981-09-17T21:36:38+03:00", "utc": "1981-09-17T18:36:38Z", "ms": 369599797602.6631 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 22:12 on Wed 16 Sep to 19:20 on Thu 17 Sep.", "fact": "1981-09-16T19:11:55Z → 1981-09-17T16:19:41Z" }, { "step": "kaala", "text": "Moonrise is at 20:55 on the 16th and 21:37 on the 17th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 16th and is not on the 17th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Neither moonrise qualifies. The day the tithi falls on is taken.", "fact": "priority: unstated → tithi-day · margin 4597 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Wednesday 16 September.", "fact": "confidence: boundary (absent-unstated)" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-16", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-16", "confidence": "boundary" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Wednesday 16 September. Caturthī runs from 22:12 on Wed 16 Sep to 19:20 on Thu 17 Sep, and is current at moonrise on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-09-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/chandra-shashthi", "festival": "chandra-shashthi", "name": "Candra Ṣaṣṭhī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20804, "anga": { "type": "tithi", "index": 20, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-09-18T16:34:11+03:00", "utc": "1981-09-18T13:34:11Z", "ms": 369668050715.8048 }, "end": { "local": "1981-09-19T14:01:43+03:00", "utc": "1981-09-19T11:01:43Z", "ms": 369745302810.6584 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-18T16:34:11+03:00", "utc": "1981-09-18T13:34:11Z", "ms": 369668050715.8048 }, "end": { "local": "1981-09-19T14:01:43+03:00", "utc": "1981-09-19T11:01:43Z", "ms": 369745302810.6584 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-09-18", "window": { "start": { "local": "1981-09-18T22:20:55+03:00", "utc": "1981-09-18T19:20:55Z", "ms": 369688855209.16815 }, "end": { "local": "1981-09-18T22:20:55+03:00", "utc": "1981-09-18T19:20:55Z", "ms": 369688855209.16815 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-09-19", "window": { "start": { "local": "1981-09-19T23:09:04+03:00", "utc": "1981-09-19T20:09:04Z", "ms": 369778144393.005 }, "end": { "local": "1981-09-19T23:09:04+03:00", "utc": "1981-09-19T20:09:04Z", "ms": 369778144393.005 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 16:34 on Fri 18 Sep to 14:02 on Sat 19 Sep.", "fact": "1981-09-18T13:34:11Z → 1981-09-19T11:01:43Z" }, { "step": "kaala", "text": "Moonrise is at 22:21 on the 18th and 23:09 on the 19th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Ṣaṣṭhī must be current at moonrise. It is on the 18th and is not on the 19th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 20804 s" }, { "step": "ruling", "text": "Candra Ṣaṣṭhī, Cairo, 1981: Friday 18 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "chandra-shashthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 6 Candra sasthi (Sasthi current at moon-rise, if occurs on two successive days, it is to be observed on the first day)." } ], "kaala": "moonrise", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-18", "confidence": "determinate" } ], "quote": "In Cairo, Candra Ṣaṣṭhī 1981 falls on Friday 18 September. Ṣaṣṭhī runs from 16:34 on Fri 18 Sep to 14:02 on Sat 19 Sep and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/chandra-shashthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/jitashtami", "festival": "jitashtami", "name": "Jitāṣṭamī", "everyday": "Jitiya", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25628, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-09-20T11:47:02+03:00", "utc": "1981-09-20T08:47:02Z", "ms": 369823622285.6271 }, "end": { "local": "1981-09-21T09:53:14+03:00", "utc": "1981-09-21T06:53:14Z", "ms": 369903194181.50146 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-20T11:47:02+03:00", "utc": "1981-09-20T08:47:02Z", "ms": 369823622285.6271 }, "end": { "local": "1981-09-21T09:53:14+03:00", "utc": "1981-09-21T06:53:14Z", "ms": 369903194181.50146 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-09-20", "window": { "start": { "local": "1981-09-20T18:54:11+03:00", "utc": "1981-09-20T15:54:11Z", "ms": 369849250528.8781 }, "end": { "local": "1981-09-20T20:28:39+03:00", "utc": "1981-09-20T17:28:39Z", "ms": 369854919376.9902 } }, "covered_min": 94, "window_min": 94, "qualifies": true }, { "local_date": "1981-09-21", "window": { "start": { "local": "1981-09-21T18:52:55+03:00", "utc": "1981-09-21T15:52:55Z", "ms": 369935575357.478 }, "end": { "local": "1981-09-21T20:27:39+03:00", "utc": "1981-09-21T17:27:39Z", "ms": 369941258622.05084 } }, "covered_min": 0, "window_min": 95, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 11:47 on Sun 20 Sep to 09:53 on Mon 21 Sep.", "fact": "1981-09-20T08:47:02Z → 1981-09-21T06:53:14Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:54–20:29 on the 20th, 18:53–20:28 on the 21st.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during pradoṣa. It covers 94 of 94 minutes on the 20th and 0 of 95 on the 21st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 25628 s" }, { "step": "ruling", "text": "Jitāṣṭamī, Cairo, 1981: Sunday 20 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "jitashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 8 Mahalaksmi vrata samapana (current at moonrise), Jitastami (pradosa), Jimutavahana puja" } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-20", "confidence": "determinate" } ], "quote": "In Cairo, Jitāṣṭamī (Jitiya) 1981 falls on Sunday 20 September. Aṣṭamī runs from 11:47 on Sun 20 Sep to 09:53 on Mon 21 Sep and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/jitashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/mahalakshmi-vrata-samapana", "festival": "mahalakshmi-vrata-samapana", "name": "Mahālakṣmī Vrata Samāpana", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35506, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-09-20T11:47:02+03:00", "utc": "1981-09-20T08:47:02Z", "ms": 369823622285.6271 }, "end": { "local": "1981-09-21T09:53:14+03:00", "utc": "1981-09-21T06:53:14Z", "ms": 369903194181.50146 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-20T11:47:02+03:00", "utc": "1981-09-20T08:47:02Z", "ms": 369823622285.6271 }, "end": { "local": "1981-09-21T09:53:14+03:00", "utc": "1981-09-21T06:53:14Z", "ms": 369903194181.50146 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-09-19", "window": { "start": { "local": "1981-09-19T23:09:04+03:00", "utc": "1981-09-19T20:09:04Z", "ms": 369778144393.005 }, "end": { "local": "1981-09-19T23:09:04+03:00", "utc": "1981-09-19T20:09:04Z", "ms": 369778144393.005 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-09-20", "window": { "start": { "local": "1981-09-21T00:01:28+03:00", "utc": "1981-09-20T21:01:28Z", "ms": 369867688134.89685 }, "end": { "local": "1981-09-21T00:01:28+03:00", "utc": "1981-09-20T21:01:28Z", "ms": 369867688134.89685 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 11:47 on Sun 20 Sep to 09:53 on Mon 21 Sep.", "fact": "1981-09-20T08:47:02Z → 1981-09-21T06:53:14Z" }, { "step": "kaala", "text": "Moonrise is at 23:09 on the 19th and 00:01 on the 20th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Aṣṭamī must be current at moonrise. It is not on the 19th and is on the 20th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 35506 s" }, { "step": "ruling", "text": "Mahālakṣmī Vrata Samāpana, Cairo, 1981: Sunday 20 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "mahalakshmi-vrata-samapana", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 8 Mahalaksmi vrata samapana (current at moonrise), Jitastami (pradosa), Jimutavahana puja" } ], "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-20", "confidence": "determinate" } ], "quote": "In Cairo, Mahālakṣmī Vrata Samāpana 1981 falls on Sunday 20 September. Aṣṭamī runs from 11:47 on Sun 20 Sep to 09:53 on Mon 21 Sep and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/mahalakshmi-vrata-samapana", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-09-23", "festival": "ekadashi", "name": "Indirā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1043, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-09-23T07:13:13+03:00", "utc": "1981-09-23T04:13:13Z", "ms": 370066393325.7998 }, "end": { "local": "1981-09-24T06:27:03+03:00", "utc": "1981-09-24T03:27:03Z", "ms": 370150023458.8285 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-23T07:13:13+03:00", "utc": "1981-09-23T04:13:13Z", "ms": 370066393325.7998 }, "end": { "local": "1981-09-24T06:27:03+03:00", "utc": "1981-09-24T03:27:03Z", "ms": 370150023458.8285 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-09-23", "window": { "start": { "local": "1981-09-23T06:43:53+03:00", "utc": "1981-09-23T03:43:53Z", "ms": 370064632940.9007 }, "end": { "local": "1981-09-23T06:43:53+03:00", "utc": "1981-09-23T03:43:53Z", "ms": 370064632940.9007 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-09-24", "window": { "start": { "local": "1981-09-24T06:44:26+03:00", "utc": "1981-09-24T03:44:26Z", "ms": 370151066197.6321 }, "end": { "local": "1981-09-24T06:44:26+03:00", "utc": "1981-09-24T03:44:26Z", "ms": 370151066197.6321 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 07:13 on Wed 23 Sep to 06:27 on Thu 24 Sep.", "fact": "1981-09-23T04:13:13Z → 1981-09-24T03:27:03Z" }, { "step": "kaala", "text": "Sunrise is at 06:44 on the 23rd and 06:44 on the 24th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 23rd and is not on the 24th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Neither sunrise qualifies. The day the tithi falls on is taken.", "fact": "priority: paraviddha → tithi-day · margin 1043 s" }, { "step": "ruling", "text": "Indirā Ekādaśī, Cairo, 1981: Wednesday 23 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-23", "confidence": "determinate" } ], "quote": "In Cairo, Indirā Ekādaśī 1981 falls on Wednesday 23 September. Ekādaśī runs from 07:13 on Wed 23 Sep to 06:27 on Thu 24 Sep, and is current at sunrise on neither day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-09-23", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-09-25", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34649, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-09-25T06:03:00+03:00", "utc": "1981-09-25T03:03:00Z", "ms": 370234979628.1569 }, "end": { "local": "1981-09-26T06:01:06+03:00", "utc": "1981-09-26T03:01:06Z", "ms": 370321265798.51874 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-25T06:03:00+03:00", "utc": "1981-09-25T03:03:00Z", "ms": 370234979628.1569 }, "end": { "local": "1981-09-26T06:01:06+03:00", "utc": "1981-09-26T03:01:06Z", "ms": 370321265798.51874 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-09-24", "window": { "start": { "local": "1981-09-24T18:49:10+03:00", "utc": "1981-09-24T15:49:10Z", "ms": 370194550414.0028 }, "end": { "local": "1981-09-24T20:24:37+03:00", "utc": "1981-09-24T17:24:37Z", "ms": 370200276975.0453 } }, "covered_min": 0, "window_min": 95, "qualifies": false }, { "local_date": "1981-09-25", "window": { "start": { "local": "1981-09-25T18:47:56+03:00", "utc": "1981-09-25T15:47:56Z", "ms": 370280875708.94366 }, "end": { "local": "1981-09-25T20:23:37+03:00", "utc": "1981-09-25T17:23:37Z", "ms": 370286616710.7972 } }, "covered_min": 96, "window_min": 96, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 06:03 on Fri 25 Sep to 06:01 on Sat 26 Sep.", "fact": "1981-09-25T03:03:00Z → 1981-09-26T03:01:06Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:49–20:25 on the 24th, 18:48–20:24 on the 25th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 95 minutes on the 24th and 96 of 96 on the 25th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 34649 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Friday 25 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-25", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Friday 25 September. Trayodaśī runs from 06:03 on Fri 25 Sep to 06:01 on Sat 26 Sep and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-09-25", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-09-26", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17421, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-09-26T06:01:06+03:00", "utc": "1981-09-26T03:01:06Z", "ms": 370321265798.51874 }, "end": { "local": "1981-09-27T06:22:05+03:00", "utc": "1981-09-27T03:22:05Z", "ms": 370408925118.95844 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-26T06:01:06+03:00", "utc": "1981-09-26T03:01:06Z", "ms": 370321265798.51874 }, "end": { "local": "1981-09-27T06:22:05+03:00", "utc": "1981-09-27T03:22:05Z", "ms": 370408925118.95844 } }, "kaala": "nishita", "days": [ { "local_date": "1981-09-25", "window": { "start": { "local": "1981-09-26T00:22:44+03:00", "utc": "1981-09-25T21:22:44Z", "ms": 370300964465.8943 }, "end": { "local": "1981-09-26T01:10:44+03:00", "utc": "1981-09-25T22:10:44Z", "ms": 370303844465.8943 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-09-26", "window": { "start": { "local": "1981-09-27T00:22:24+03:00", "utc": "1981-09-26T21:22:24Z", "ms": 370387344096.81287 }, "end": { "local": "1981-09-27T01:10:24+03:00", "utc": "1981-09-26T22:10:24Z", "ms": 370390224096.81287 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 06:01 on Sat 26 Sep to 06:22 on Sun 27 Sep.", "fact": "1981-09-26T03:01:06Z → 1981-09-27T03:22:05Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:23–01:11 on the 25th, 00:22–01:10 on the 26th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 25th and 48 of 48 on the 26th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 17421 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Saturday 26 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-26", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Saturday 26 September. Caturdaśī runs from 06:01 on Sat 26 Sep to 06:22 on Sun 27 Sep and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-09-26", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/mahalaya-amavasya", "festival": "mahalaya-amavasya", "name": "Mahālaya Amāvāsyā", "everyday": "Sarvapitṛ Amāvāsyā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24600, "anga": { "type": "tithi", "index": 29, "key": "amavasya", "name": "Amāvasyā", "start": { "local": "1981-09-27T06:22:05+03:00", "utc": "1981-09-27T03:22:05Z", "ms": 370408925118.95844 }, "end": { "local": "1981-09-28T07:07:12+03:00", "utc": "1981-09-28T04:07:12Z", "ms": 370498032303.0421 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-27T06:22:05+03:00", "utc": "1981-09-27T03:22:05Z", "ms": 370408925118.95844 }, "end": { "local": "1981-09-28T07:07:12+03:00", "utc": "1981-09-28T04:07:12Z", "ms": 370498032303.0421 } }, "kaala": "aparahna", "days": [ { "local_date": "1981-09-27", "window": { "start": { "local": "1981-09-27T13:57:43+03:00", "utc": "1981-09-27T10:57:43Z", "ms": 370436262922.0718 }, "end": { "local": "1981-09-27T16:21:35+03:00", "utc": "1981-09-27T13:21:35Z", "ms": 370444894892.8356 } }, "covered_min": 144, "window_min": 144, "qualifies": true }, { "local_date": "1981-09-28", "window": { "start": { "local": "1981-09-28T13:57:12+03:00", "utc": "1981-09-28T10:57:12Z", "ms": 370522632060.52545 }, "end": { "local": "1981-09-28T16:20:42+03:00", "utc": "1981-09-28T13:20:42Z", "ms": 370531242416.8471 } }, "covered_min": 0, "window_min": 144, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Amāvasyā runs from 06:22 on Sun 27 Sep to 07:07 on Mon 28 Sep.", "fact": "1981-09-27T03:22:05Z → 1981-09-28T04:07:12Z" }, { "step": "kaala", "text": "Aparāhṇa is 10th to 12th of 15 day muhūrtas: 13:58–16:22 on the 27th, 13:57–16:21 on the 28th.", "fact": "aparahna: day-muhurta-10-12 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Amāvasyā must be present during aparāhṇa. It covers 144 of 144 minutes on the 27th and 0 of 144 on the 28th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one afternoon qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 24600 s" }, { "step": "ruling", "text": "Mahālaya Amāvāsyā, Cairo, 1981: Sunday 27 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "mahalaya-amavasya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 103", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 30 Mahalaya amavasya (aparahnavyapini)" } ], "not_evaluated": "The note on p. 106 gives the first day in a decreasing tithimāna and the second in an increasing one, when amāvāsyā covers the whole of aparāhṇa on both days; tithimāna is not computed.", "kaala": "aparahna", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-27", "confidence": "determinate" } ], "quote": "In Cairo, Mahālaya Amāvāsyā 1981 falls on Sunday 27 September. Amāvasyā runs from 06:22 on Sun 27 Sep to 07:07 on Mon 28 Sep and covers all of aparāhṇa that afternoon.", "cite": "https://ahargana.org/cairo/festivals/1981/mahalaya-amavasya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/navaratra-arambha", "festival": "navaratra-arambha", "name": "Navarātrārambha", "everyday": "Navratri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-09-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 14604, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-09-28T07:07:12+03:00", "utc": "1981-09-28T04:07:12Z", "ms": 370498032303.0421 }, "end": { "local": "1981-09-29T08:17:43+03:00", "utc": "1981-09-29T05:17:43Z", "ms": 370588663327.2907 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-09-28T07:07:12+03:00", "utc": "1981-09-28T04:07:12Z", "ms": 370498032303.0421 }, "end": { "local": "1981-09-29T08:17:43+03:00", "utc": "1981-09-29T05:17:43Z", "ms": 370588663327.2907 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-09-28", "window": { "start": { "local": "1981-09-28T12:21:27+03:00", "utc": "1981-09-28T09:21:27Z", "ms": 370516886882.3646 }, "end": { "local": "1981-09-28T13:09:27+03:00", "utc": "1981-09-28T10:09:27Z", "ms": 370519766882.3646 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-09-29", "window": { "start": { "local": "1981-09-29T12:21:07+03:00", "utc": "1981-09-29T09:21:07Z", "ms": 370603267057.41235 }, "end": { "local": "1981-09-29T13:09:07+03:00", "utc": "1981-09-29T10:09:07Z", "ms": 370606147057.41235 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 07:07 on Mon 28 Sep to 08:18 on Tue 29 Sep.", "fact": "1981-09-28T04:07:12Z → 1981-09-29T05:17:43Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:21–13:09 on the 28th, 12:21–13:09 on the 29th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during madhyāhna. It covers 48 of 48 minutes on the 28th and 0 of 48 on the 29th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 14604 s" }, { "step": "ruling", "text": "Navarātrārambha, Cairo, 1981: Monday 28 September.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "navaratra-arambha", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 1 Navaratrarambha (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-09-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-09-28", "confidence": "determinate" } ], "quote": "In Cairo, Navarātrārambha (Navratri) 1981 falls on Monday 28 September. Pratipadā runs from 07:07 on Mon 28 Sep to 08:18 on Tue 29 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/navaratra-arambha", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-10-01", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-01", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 1535, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-10-01T10:54:53+02:00", "utc": "1981-10-01T08:54:53Z", "ms": 370774492901.53485 }, "end": { "local": "1981-10-02T13:15:48+02:00", "utc": "1981-10-02T11:15:48Z", "ms": 370869347868.8698 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-10-01T10:54:53+02:00", "utc": "1981-10-01T08:54:53Z", "ms": 370774492901.53485 }, "end": { "local": "1981-10-02T13:15:48+02:00", "utc": "1981-10-02T11:15:48Z", "ms": 370869347868.8698 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-01", "window": { "start": { "local": "1981-10-01T11:20:28+02:00", "utc": "1981-10-01T09:20:28Z", "ms": 370776028164.99365 }, "end": { "local": "1981-10-01T12:08:28+02:00", "utc": "1981-10-01T10:08:28Z", "ms": 370778908164.99365 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-10-02", "window": { "start": { "local": "1981-10-02T11:20:09+02:00", "utc": "1981-10-02T09:20:09Z", "ms": 370862409133.0411 }, "end": { "local": "1981-10-02T12:08:09+02:00", "utc": "1981-10-02T10:08:09Z", "ms": 370865289133.0411 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Caturthī runs from 10:55 on Thu 1 Oct to 13:16 on Fri 2 Oct.", "fact": "1981-10-01T08:54:53Z → 1981-10-02T11:15:48Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 1st, 11:20–12:08 on the 2nd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 1st and 48 of 48 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 1535 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Thursday 1 October.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-01", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-02", "confidence": "boundary" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Thursday 1 October. Caturthī runs from 10:55 on Thu 1 Oct to 13:16 on Fri 2 Oct and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-10-01", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/durga-saptami", "festival": "durga-saptami", "name": "Durgā Saptamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32840, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-10-04T18:22:57+02:00", "utc": "1981-10-04T16:22:57Z", "ms": 371060577496.8392 }, "end": { "local": "1981-10-05T20:44:01+02:00", "utc": "1981-10-05T18:44:01Z", "ms": 371155441123.88776 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-10-04T18:22:57+02:00", "utc": "1981-10-04T16:22:57Z", "ms": 371060577496.8392 }, "end": { "local": "1981-10-05T20:44:01+02:00", "utc": "1981-10-05T18:44:01Z", "ms": 371155441123.88776 } }, "kaala": "udaya-1", "days": [ { "local_date": "1981-10-05", "window": { "start": { "local": "1981-10-05T05:50:45+02:00", "utc": "1981-10-05T03:50:45Z", "ms": 371101845081.27045 }, "end": { "local": "1981-10-05T06:37:45+02:00", "utc": "1981-10-05T04:37:45Z", "ms": 371104664925.236 } }, "covered_min": 47, "window_min": 47, "qualifies": true }, { "local_date": "1981-10-06", "window": { "start": { "local": "1981-10-06T05:51:21+02:00", "utc": "1981-10-06T03:51:21Z", "ms": 371188280951.884 }, "end": { "local": "1981-10-06T06:38:14+02:00", "utc": "1981-10-06T04:38:14Z", "ms": 371191093650.3738 } }, "covered_min": 0, "window_min": 47, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 18:23 on Sun 4 Oct to 20:44 on Mon 5 Oct.", "fact": "1981-10-04T16:22:57Z → 1981-10-05T18:44:01Z" }, { "step": "kaala", "text": "The first muhūrta after sunrise is 1st of 15 day muhūrtas: 05:51–06:38 on the 5th, 05:51–06:38 on the 6th.", "fact": "udaya-1: day-muhurta-1-1 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must hold through the first muhūrta after sunrise. It covers 47 of 47 minutes on the 5th and 0 of 47 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one morning qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 32840 s" }, { "step": "ruling", "text": "Durgā Saptamī, Cairo, 1981: Monday 5 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "durga-saptami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 7 Durga saptami (paraviddha) — covering one muhurta from sunrise" } ], "kaala": "udaya-1", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-05", "confidence": "determinate" } ], "quote": "In Cairo, Durgā Saptamī 1981 falls on Monday 5 October. Saptamī runs from 18:23 on Sun 4 Oct to 20:44 on Mon 5 Oct and covers all of the first muhūrta after sunrise that morning.", "cite": "https://ahargana.org/cairo/festivals/1981/durga-saptami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/mahashtami", "festival": "mahashtami", "name": "Mahāṣṭamī", "everyday": "Durga Ashtami", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 31007, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-10-05T20:44:01+02:00", "utc": "1981-10-05T18:44:01Z", "ms": 371155441123.88776 }, "end": { "local": "1981-10-06T22:37:54+02:00", "utc": "1981-10-06T20:37:54Z", "ms": 371248673709.7348 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-10-05T20:44:01+02:00", "utc": "1981-10-05T18:44:01Z", "ms": 371155441123.88776 }, "end": { "local": "1981-10-06T22:37:54+02:00", "utc": "1981-10-06T20:37:54Z", "ms": 371248673709.7348 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-05", "window": { "start": { "local": "1981-10-05T11:19:14+02:00", "utc": "1981-10-05T09:19:14Z", "ms": 371121553911.01215 }, "end": { "local": "1981-10-05T12:07:14+02:00", "utc": "1981-10-05T10:07:14Z", "ms": 371124433911.01215 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-10-06", "window": { "start": { "local": "1981-10-06T11:18:56+02:00", "utc": "1981-10-06T09:18:56Z", "ms": 371207936190.5575 }, "end": { "local": "1981-10-06T12:06:56+02:00", "utc": "1981-10-06T10:06:56Z", "ms": 371210816190.5575 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 20:44 on Mon 5 Oct to 22:38 on Tue 6 Oct.", "fact": "1981-10-05T18:44:01Z → 1981-10-06T20:37:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:19–12:07 on the 5th, 11:19–12:07 on the 6th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during madhyāhna. It covers 0 of 48 minutes on the 5th and 48 of 48 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 31007 s" }, { "step": "ruling", "text": "Mahāṣṭamī, Cairo, 1981: Tuesday 6 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "mahashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 8 Mahastami (paraviddha)" } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-06", "confidence": "determinate" } ], "quote": "In Cairo, Mahāṣṭamī (Durga Ashtami) 1981 falls on Tuesday 6 October. Aṣṭamī runs from 20:44 on Mon 5 Oct to 22:38 on Tue 6 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/mahashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/mahanavami", "festival": "mahanavami", "name": "Mahānavamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 37858, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "1981-10-06T22:37:54+02:00", "utc": "1981-10-06T20:37:54Z", "ms": 371248673709.7348 }, "end": { "local": "1981-10-07T23:52:15+02:00", "utc": "1981-10-07T21:52:15Z", "ms": 371339534945.2302 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-10-06T22:37:54+02:00", "utc": "1981-10-06T20:37:54Z", "ms": 371248673709.7348 }, "end": { "local": "1981-10-07T23:52:15+02:00", "utc": "1981-10-07T21:52:15Z", "ms": 371339534945.2302 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-06", "window": { "start": { "local": "1981-10-06T11:18:56+02:00", "utc": "1981-10-06T09:18:56Z", "ms": 371207936190.5575 }, "end": { "local": "1981-10-06T12:06:56+02:00", "utc": "1981-10-06T10:06:56Z", "ms": 371210816190.5575 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-10-07", "window": { "start": { "local": "1981-10-07T11:18:39+02:00", "utc": "1981-10-07T09:18:39Z", "ms": 371294318845.454 }, "end": { "local": "1981-10-07T12:06:39+02:00", "utc": "1981-10-07T10:06:39Z", "ms": 371297198845.454 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Navamī runs from 22:38 on Tue 6 Oct to 23:52 on Wed 7 Oct.", "fact": "1981-10-06T20:37:54Z → 1981-10-07T21:52:15Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:19–12:07 on the 6th, 11:19–12:07 on the 7th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Navamī must be present during madhyāhna. It covers 0 of 48 minutes on the 6th and 48 of 48 on the 7th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 37858 s" }, { "step": "ruling", "text": "Mahānavamī, Cairo, 1981: Wednesday 7 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "mahanavami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 9 Mahanavami (purvaviddha) (In Bengal it is observed as paraviddha covering one muhurta from sunrise)." } ], "not_evaluated": "The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.", "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-07", "confidence": "determinate" } ], "quote": "In Cairo, Mahānavamī 1981 falls on Wednesday 7 October. Navamī runs from 22:38 on Tue 6 Oct to 23:52 on Wed 7 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/mahanavami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vijaya-dashami", "festival": "vijaya-dashami", "name": "Vijayā Daśamī", "everyday": "Dussehra", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 14328, "anga": { "type": "tithi", "index": 9, "key": "dashami", "name": "Daśamī", "start": { "local": "1981-10-07T23:52:15+02:00", "utc": "1981-10-07T21:52:15Z", "ms": 371339534945.2302 }, "end": { "local": "1981-10-09T00:18:34+02:00", "utc": "1981-10-08T22:18:34Z", "ms": 371427514378.2704 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "conjunction", "start": { "local": "1981-10-08T01:53:45+02:00", "utc": "1981-10-07T23:53:45Z", "ms": 371346825311.46515 }, "end": { "local": "1981-10-09T00:18:34+02:00", "utc": "1981-10-08T22:18:34Z", "ms": 371427514378.2704 }, "nakshatra": { "type": "nakshatra", "index": 21, "key": "shravana", "name": "Śravaṇa", "start": { "local": "1981-10-08T01:53:45+02:00", "utc": "1981-10-07T23:53:45Z", "ms": 371346825311.46515 }, "end": { "local": "1981-10-09T02:52:30+02:00", "utc": "1981-10-09T00:52:30Z", "ms": 371436750168.04706 } } }, "kaala": "daytime", "days": [ { "local_date": "1981-10-08", "window": { "start": { "local": "1981-10-08T05:52:34+02:00", "utc": "1981-10-08T03:52:34Z", "ms": 371361153541.583 }, "end": { "local": "1981-10-08T17:32:10+02:00", "utc": "1981-10-08T15:32:10Z", "ms": 371403130249.2086 } }, "covered_min": 700, "window_min": 700, "qualifies": true }, { "local_date": "1981-10-09", "window": { "start": { "local": "1981-10-09T05:53:10+02:00", "utc": "1981-10-09T03:53:10Z", "ms": 371447590281.53723 }, "end": { "local": "1981-10-09T17:31:00+02:00", "utc": "1981-10-09T15:31:00Z", "ms": 371489460439.58215 } }, "covered_min": 0, "window_min": 698, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Daśamī runs from 23:52 on Wed 7 Oct to 00:19 on Fri 9 Oct, and Śravaṇa from 01:54 on Thu 8 Oct to 02:53 on Fri 9 Oct. They are together from 01:54 on Thu 8 Oct to 00:19 on Fri 9 Oct.", "fact": "1981-10-07T23:53:45Z → 1981-10-08T22:18:34Z" }, { "step": "kaala", "text": "The day time is sunrise to sunset: 05:53–17:32 on the 8th, 05:53–17:31 on the 9th.", "fact": "daytime: sunrise-to-sunset · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Where Daśamī touches Śravaṇa in the day time, that day is taken. Together they cover 700 of 700 minutes on the 8th and 0 of 698 on the 9th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one day qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 14328 s" }, { "step": "ruling", "text": "Vijayā Daśamī, Cairo, 1981: Thursday 8 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vijaya-dashami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 10 Vijaya dasami (In Bengal it is observed as paraviddha, covering one muhurta from sunrise. In other places, if it touches Sravana naksatra in the day time it is observed on that day), Sarasvati visarjana (to be observed in naksatra Sravana), Dasahara." } ], "not_evaluated": "The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.", "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day", "conjunction": { "nakshatra": "Śravaṇa", "kaala": "daytime" } }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-08", "confidence": "determinate" } ], "quote": "In Cairo, Vijayā Daśamī (Dussehra) 1981 falls on Thursday 8 October. Daśamī runs from 23:52 on Wed 7 Oct to 00:19 on Fri 9 Oct and is with Śravaṇa in the day time that day, for 700 minutes.", "cite": "https://ahargana.org/cairo/festivals/1981/vijaya-dashami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-10-09", "festival": "ekadashi", "name": "Pāśāṅkuśā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20076, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-10-09T00:18:34+02:00", "utc": "1981-10-08T22:18:34Z", "ms": 371427514378.2704 }, "end": { "local": "1981-10-09T23:53:11+02:00", "utc": "1981-10-09T21:53:11Z", "ms": 371512390529.68317 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-10-09T00:18:34+02:00", "utc": "1981-10-08T22:18:34Z", "ms": 371427514378.2704 }, "end": { "local": "1981-10-09T23:53:11+02:00", "utc": "1981-10-09T21:53:11Z", "ms": 371512390529.68317 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-10-09", "window": { "start": { "local": "1981-10-09T05:53:10+02:00", "utc": "1981-10-09T03:53:10Z", "ms": 371447590281.53723 }, "end": { "local": "1981-10-09T05:53:10+02:00", "utc": "1981-10-09T03:53:10Z", "ms": 371447590281.53723 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-10-10", "window": { "start": { "local": "1981-10-10T05:53:47+02:00", "utc": "1981-10-10T03:53:47Z", "ms": 371534027332.92584 }, "end": { "local": "1981-10-10T05:53:47+02:00", "utc": "1981-10-10T03:53:47Z", "ms": 371534027332.92584 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 00:19 on Fri 9 Oct to 23:53 on Fri 9 Oct.", "fact": "1981-10-08T22:18:34Z → 1981-10-09T21:53:11Z" }, { "step": "kaala", "text": "Sunrise is at 05:53 on the 9th and 05:54 on the 10th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 9th and is not on the 10th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 20076 s" }, { "step": "ruling", "text": "Pāśāṅkuśā Ekādaśī, Cairo, 1981: Friday 9 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-09", "confidence": "determinate" } ], "quote": "In Cairo, Pāśāṅkuśā Ekādaśī 1981 falls on Friday 9 October. Ekādaśī runs from 00:19 on Fri 9 Oct to 23:53 on Fri 9 Oct and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-10-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-10-11", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5239, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-10-10T22:37:08+02:00", "utc": "1981-10-10T20:37:08Z", "ms": 371594228219.20056 }, "end": { "local": "1981-10-11T20:35:32+02:00", "utc": "1981-10-11T18:35:32Z", "ms": 371673332078.81757 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "1981-10-10T22:37:08+02:00", "utc": "1981-10-10T20:37:08Z", "ms": 371594228219.20056 }, "end": { "local": "1981-10-11T20:35:32+02:00", "utc": "1981-10-11T18:35:32Z", "ms": 371673332078.81757 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-10-10", "window": { "start": { "local": "1981-10-10T17:29:51+02:00", "utc": "1981-10-10T15:29:51Z", "ms": 371575791190.5153 }, "end": { "local": "1981-10-10T19:09:08+02:00", "utc": "1981-10-10T17:09:08Z", "ms": 371581747659.4658 } }, "covered_min": 0, "window_min": 99, "qualifies": false }, { "local_date": "1981-10-11", "window": { "start": { "local": "1981-10-11T17:28:43+02:00", "utc": "1981-10-11T15:28:43Z", "ms": 371662122533.0642 }, "end": { "local": "1981-10-11T19:08:13+02:00", "utc": "1981-10-11T17:08:13Z", "ms": 371668093184.4522 } }, "covered_min": 100, "window_min": 100, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 22:37 on Sat 10 Oct to 20:36 on Sun 11 Oct.", "fact": "1981-10-10T20:37:08Z → 1981-10-11T18:35:32Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:30–19:09 on the 10th, 17:29–19:08 on the 11th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 99 minutes on the 10th and 100 of 100 on the 11th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 5239 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Sunday 11 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-11", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Sunday 11 October. Trayodaśī runs from 22:37 on Sat 10 Oct to 20:36 on Sun 11 Oct and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-10-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/karaka-chaturthi", "festival": "karaka-chaturthi", "name": "Karaka Caturthī", "everyday": "Karwa Chauth", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18972, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-10-16T04:29:51+02:00", "utc": "1981-10-16T02:29:51Z", "ms": 372047390558.7802 }, "end": { "local": "1981-10-17T01:18:21+02:00", "utc": "1981-10-16T23:18:21Z", "ms": 372122301165.8827 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-16T04:29:51+02:00", "utc": "1981-10-16T02:29:51Z", "ms": 372047390558.7802 }, "end": { "local": "1981-10-17T01:18:21+02:00", "utc": "1981-10-16T23:18:21Z", "ms": 372122301165.8827 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-10-15", "window": { "start": { "local": "1981-10-15T19:13:57+02:00", "utc": "1981-10-15T17:13:57Z", "ms": 372014036719.5327 }, "end": { "local": "1981-10-15T19:13:57+02:00", "utc": "1981-10-15T17:13:57Z", "ms": 372014036719.5327 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-10-16", "window": { "start": { "local": "1981-10-16T20:02:09+02:00", "utc": "1981-10-16T18:02:09Z", "ms": 372103329067.9292 }, "end": { "local": "1981-10-16T20:02:09+02:00", "utc": "1981-10-16T18:02:09Z", "ms": 372103329067.9292 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 04:30 on Fri 16 Oct to 01:18 on Sat 17 Oct.", "fact": "1981-10-16T02:29:51Z → 1981-10-16T23:18:21Z" }, { "step": "kaala", "text": "Moonrise is at 19:14 on the 15th and 20:02 on the 16th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 15th and is on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 18972 s" }, { "step": "ruling", "text": "Karaka Caturthī, Cairo, 1981: Friday 16 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "karaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 4 Karaka caturthi (current at moon-rise, if occurs on two successive days, it is to be observed on the first day)" } ], "kaala": "moonrise", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-16", "confidence": "determinate" } ], "quote": "In Cairo, Karaka Caturthī (Karwa Chauth) 1981 falls on Friday 16 October. Caturthī runs from 04:30 on Fri 16 Oct to 01:18 on Sat 17 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/karaka-chaturthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-10-16", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18972, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-10-16T04:29:51+02:00", "utc": "1981-10-16T02:29:51Z", "ms": 372047390558.7802 }, "end": { "local": "1981-10-17T01:18:21+02:00", "utc": "1981-10-16T23:18:21Z", "ms": 372122301165.8827 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-16T04:29:51+02:00", "utc": "1981-10-16T02:29:51Z", "ms": 372047390558.7802 }, "end": { "local": "1981-10-17T01:18:21+02:00", "utc": "1981-10-16T23:18:21Z", "ms": 372122301165.8827 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-10-15", "window": { "start": { "local": "1981-10-15T19:13:57+02:00", "utc": "1981-10-15T17:13:57Z", "ms": 372014036719.5327 }, "end": { "local": "1981-10-15T19:13:57+02:00", "utc": "1981-10-15T17:13:57Z", "ms": 372014036719.5327 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-10-16", "window": { "start": { "local": "1981-10-16T20:02:09+02:00", "utc": "1981-10-16T18:02:09Z", "ms": 372103329067.9292 }, "end": { "local": "1981-10-16T20:02:09+02:00", "utc": "1981-10-16T18:02:09Z", "ms": 372103329067.9292 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 04:30 on Fri 16 Oct to 01:18 on Sat 17 Oct.", "fact": "1981-10-16T02:29:51Z → 1981-10-16T23:18:21Z" }, { "step": "kaala", "text": "Moonrise is at 19:14 on the 15th and 20:02 on the 16th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 15th and is on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 18972 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Friday 16 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-16", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Friday 16 October. Caturthī runs from 04:30 on Fri 16 Oct to 01:18 on Sat 17 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-10-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ahoyi-ashtami", "festival": "ahoyi-ashtami", "name": "Ahoyī Aṣṭamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16169, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-10-19T18:21:14+02:00", "utc": "1981-10-19T16:21:14Z", "ms": 372356474335.9135 }, "end": { "local": "1981-10-20T17:08:27+02:00", "utc": "1981-10-20T15:08:27Z", "ms": 372438506544.0732 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-19T18:21:14+02:00", "utc": "1981-10-19T16:21:14Z", "ms": 372356474335.9135 }, "end": { "local": "1981-10-20T17:08:27+02:00", "utc": "1981-10-20T15:08:27Z", "ms": 372438506544.0732 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-10-19", "window": { "start": { "local": "1981-10-19T22:50:43+02:00", "utc": "1981-10-19T20:50:43Z", "ms": 372372643365.16425 }, "end": { "local": "1981-10-19T22:50:43+02:00", "utc": "1981-10-19T20:50:43Z", "ms": 372372643365.16425 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-10-20", "window": { "start": { "local": "1981-10-20T23:51:16+02:00", "utc": "1981-10-20T21:51:16Z", "ms": 372462675816.62036 }, "end": { "local": "1981-10-20T23:51:16+02:00", "utc": "1981-10-20T21:51:16Z", "ms": 372462675816.62036 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 18:21 on Mon 19 Oct to 17:08 on Tue 20 Oct.", "fact": "1981-10-19T16:21:14Z → 1981-10-20T15:08:27Z" }, { "step": "kaala", "text": "Moonrise is at 22:51 on the 19th and 23:51 on the 20th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Aṣṭamī must be current at moonrise. It is on the 19th and is not on the 20th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 16169 s" }, { "step": "ruling", "text": "Ahoyī Aṣṭamī, Cairo, 1981: Monday 19 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ahoyi-ashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 8 Ahoyi astami (Gujerat) (current at moonrise), Karastami (Maharashtra). If occurs on two successive days, it is to be observed on the second day." } ], "kaala": "moonrise", "priority": "paraviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-19", "confidence": "determinate" } ], "quote": "In Cairo, Ahoyī Aṣṭamī 1981 falls on Monday 19 October. Aṣṭamī runs from 18:21 on Mon 19 Oct to 17:08 on Tue 20 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ahoyi-ashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-10-23", "festival": "ekadashi", "name": "Ramā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 37321, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-10-22T16:23:42+02:00", "utc": "1981-10-22T14:23:42Z", "ms": 372608621868.8996 }, "end": { "local": "1981-10-23T16:46:33+02:00", "utc": "1981-10-23T14:46:33Z", "ms": 372696392519.1503 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-22T16:23:42+02:00", "utc": "1981-10-22T14:23:42Z", "ms": 372608621868.8996 }, "end": { "local": "1981-10-23T16:46:33+02:00", "utc": "1981-10-23T14:46:33Z", "ms": 372696392519.1503 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-10-22", "window": { "start": { "local": "1981-10-22T06:01:41+02:00", "utc": "1981-10-22T04:01:41Z", "ms": 372571300802.95935 }, "end": { "local": "1981-10-22T06:01:41+02:00", "utc": "1981-10-22T04:01:41Z", "ms": 372571300802.95935 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-10-23", "window": { "start": { "local": "1981-10-23T06:02:23+02:00", "utc": "1981-10-23T04:02:23Z", "ms": 372657742950.874 }, "end": { "local": "1981-10-23T06:02:23+02:00", "utc": "1981-10-23T04:02:23Z", "ms": 372657742950.874 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 16:24 on Thu 22 Oct to 16:47 on Fri 23 Oct.", "fact": "1981-10-22T14:23:42Z → 1981-10-23T14:46:33Z" }, { "step": "kaala", "text": "Sunrise is at 06:02 on the 22nd and 06:02 on the 23rd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 22nd and is on the 23rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 37321 s" }, { "step": "ruling", "text": "Ramā Ekādaśī, Cairo, 1981: Friday 23 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-23", "confidence": "determinate" } ], "quote": "In Cairo, Ramā Ekādaśī 1981 falls on Friday 23 October. Ekādaśī runs from 16:24 on Thu 22 Oct to 16:47 on Fri 23 Oct and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-10-23", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/govatsa-dvadashi", "festival": "govatsa-dvadashi", "name": "Govatsa Dvādaśī", "everyday": "Vasu Baras", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1219, "anga": { "type": "tithi", "index": 26, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-10-23T16:46:33+02:00", "utc": "1981-10-23T14:46:33Z", "ms": 372696392519.1503 }, "end": { "local": "1981-10-24T17:35:17+02:00", "utc": "1981-10-24T15:35:17Z", "ms": 372785717161.5931 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-23T16:46:33+02:00", "utc": "1981-10-23T14:46:33Z", "ms": 372696392519.1503 }, "end": { "local": "1981-10-24T17:35:17+02:00", "utc": "1981-10-24T15:35:17Z", "ms": 372785717161.5931 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-10-23", "window": { "start": { "local": "1981-10-23T17:15:56+02:00", "utc": "1981-10-23T15:15:56Z", "ms": 372698156346.0258 }, "end": { "local": "1981-10-23T18:58:14+02:00", "utc": "1981-10-23T16:58:14Z", "ms": 372704293570.2509 } }, "covered_min": 102, "window_min": 102, "qualifies": true }, { "local_date": "1981-10-24", "window": { "start": { "local": "1981-10-24T17:14:58+02:00", "utc": "1981-10-24T15:14:58Z", "ms": 372784498225.24335 }, "end": { "local": "1981-10-24T18:57:29+02:00", "utc": "1981-10-24T16:57:29Z", "ms": 372790648932.6168 } }, "covered_min": 20, "window_min": 103, "qualifies": true } ], "decided_by": "purvaviddha", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 16:47 on Fri 23 Oct to 17:35 on Sat 24 Oct.", "fact": "1981-10-23T14:46:33Z → 1981-10-24T15:35:17Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:16–18:58 on the 23rd, 17:15–18:57 on the 24th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during pradoṣa. It covers 102 of 102 minutes on the 23rd and 20 of 103 on the 24th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Both evenings qualify. Pūrvaviddhā: the first is taken.", "fact": "priority: purvaviddha → purvaviddha · margin 1219 s" }, { "step": "ruling", "text": "Govatsa Dvādaśī, Cairo, 1981: Friday 23 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "govatsa-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 12 Govatsa dvadasi (pradosa vyapini). If occurs on two days, it is to be observed on the first day." } ], "kaala": "pradosha", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-23", "confidence": "determinate" } ], "quote": "In Cairo, Govatsa Dvādaśī (Vasu Baras) 1981 falls on Friday 23 October. Dvādaśī runs from 16:47 on Fri 23 Oct to 17:35 on Sat 24 Oct and covers all of pradoṣa that evening. It also reaches the next evening for 20 minutes; by the rule the first evening is taken.", "cite": "https://ahargana.org/cairo/festivals/1981/govatsa-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/yama-dipadana", "festival": "yama-dipadana", "name": "Yama Dīpadāna", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-25", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 572, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-10-24T17:35:17+02:00", "utc": "1981-10-24T15:35:17Z", "ms": 372785717161.5931 }, "end": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-24T17:35:17+02:00", "utc": "1981-10-24T15:35:17Z", "ms": 372785717161.5931 }, "end": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-10-24", "window": { "start": { "local": "1981-10-24T17:14:58+02:00", "utc": "1981-10-24T15:14:58Z", "ms": 372784498225.24335 }, "end": { "local": "1981-10-24T18:57:29+02:00", "utc": "1981-10-24T16:57:29Z", "ms": 372790648932.6168 } }, "covered_min": 82, "window_min": 103, "qualifies": true }, { "local_date": "1981-10-25", "window": { "start": { "local": "1981-10-25T17:14:01+02:00", "utc": "1981-10-25T15:14:01Z", "ms": 372870841115.94037 }, "end": { "local": "1981-10-25T18:56:45+02:00", "utc": "1981-10-25T16:56:45Z", "ms": 372877005227.8393 } }, "covered_min": 93, "window_min": 103, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 17:35 on Sat 24 Oct to 18:47 on Sun 25 Oct.", "fact": "1981-10-24T15:35:17Z → 1981-10-25T16:47:13Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:15–18:57 on the 24th, 17:14–18:57 on the 25th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 82 of 103 minutes on the 24th and 93 of 103 on the 25th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Both evenings qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 572 s" }, { "step": "ruling", "text": "Yama Dīpadāna, Cairo, 1981: Sunday 25 October.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "yama-dipadana", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 13 Yama dipadana (pradosa)." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-25", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-24", "confidence": "boundary" } ], "quote": "In Cairo, Yama Dīpadāna 1981 falls on Sunday 25 October. Trayodaśī runs from 17:35 on Sat 24 Oct to 18:47 on Sun 25 Oct and covers 93 of 103 minutes of pradoṣa that evening. It also reaches the previous evening for 82 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/yama-dipadana", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-10-25", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-25", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 572, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-10-24T17:35:17+02:00", "utc": "1981-10-24T15:35:17Z", "ms": 372785717161.5931 }, "end": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-24T17:35:17+02:00", "utc": "1981-10-24T15:35:17Z", "ms": 372785717161.5931 }, "end": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-10-24", "window": { "start": { "local": "1981-10-24T17:14:58+02:00", "utc": "1981-10-24T15:14:58Z", "ms": 372784498225.24335 }, "end": { "local": "1981-10-24T18:57:29+02:00", "utc": "1981-10-24T16:57:29Z", "ms": 372790648932.6168 } }, "covered_min": 82, "window_min": 103, "qualifies": true }, { "local_date": "1981-10-25", "window": { "start": { "local": "1981-10-25T17:14:01+02:00", "utc": "1981-10-25T15:14:01Z", "ms": 372870841115.94037 }, "end": { "local": "1981-10-25T18:56:45+02:00", "utc": "1981-10-25T16:56:45Z", "ms": 372877005227.8393 } }, "covered_min": 93, "window_min": 103, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 17:35 on Sat 24 Oct to 18:47 on Sun 25 Oct.", "fact": "1981-10-24T15:35:17Z → 1981-10-25T16:47:13Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:15–18:57 on the 24th, 17:14–18:57 on the 25th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 82 of 103 minutes on the 24th and 93 of 103 on the 25th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Both evenings qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 572 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Sunday 25 October.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-25", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-24", "confidence": "boundary" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Sunday 25 October. Trayodaśī runs from 17:35 on Sat 24 Oct to 18:47 on Sun 25 Oct and covers 93 of 103 minutes of pradoṣa that evening. It also reaches the previous evening for 82 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-10-25", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-10-25", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 10489, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 }, "end": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 }, "end": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 } }, "kaala": "nishita", "days": [ { "local_date": "1981-10-25", "window": { "start": { "local": "1981-10-25T23:15:17+02:00", "utc": "1981-10-25T21:15:17Z", "ms": 372892516535.5614 }, "end": { "local": "1981-10-26T00:03:17+02:00", "utc": "1981-10-25T22:03:17Z", "ms": 372895396535.5614 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-10-26", "window": { "start": { "local": "1981-10-26T23:15:10+02:00", "utc": "1981-10-26T21:15:10Z", "ms": 372978910420.1549 }, "end": { "local": "1981-10-27T00:03:10+02:00", "utc": "1981-10-26T22:03:10Z", "ms": 372981790420.1549 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 18:47 on Sun 25 Oct to 20:20 on Mon 26 Oct.", "fact": "1981-10-25T16:47:13Z → 1981-10-26T18:20:22Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:15–00:03 on the 25th, 23:15–00:03 on the 26th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 25th and 0 of 48 on the 26th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 10489 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Sunday 25 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-25", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Sunday 25 October. Caturdaśī runs from 18:47 on Sun 25 Oct to 20:20 on Mon 26 Oct and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-10-25", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/naraka-chaturdashi", "festival": "naraka-chaturdashi", "name": "Naraka Caturdaśī", "everyday": "Choti Diwali", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28917, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 }, "end": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-25T18:47:13+02:00", "utc": "1981-10-25T16:47:13Z", "ms": 372876432923.1547 }, "end": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 } }, "kaala": "arunodaya", "days": [ { "local_date": "1981-10-26", "window": { "start": { "local": "1981-10-26T04:21:48+02:00", "utc": "1981-10-26T02:21:48Z", "ms": 372910907843.28345 }, "end": { "local": "1981-10-26T06:04:32+02:00", "utc": "1981-10-26T04:04:32Z", "ms": 372917071955.1824 } }, "covered_min": 103, "window_min": 103, "qualifies": true }, { "local_date": "1981-10-27", "window": { "start": { "local": "1981-10-27T04:22:18+02:00", "utc": "1981-10-27T02:22:18Z", "ms": 372997338362.6373 }, "end": { "local": "1981-10-27T06:05:16+02:00", "utc": "1981-10-27T04:05:16Z", "ms": 373003515796.26733 } }, "covered_min": 0, "window_min": 103, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 18:47 on Sun 25 Oct to 20:20 on Mon 26 Oct.", "fact": "1981-10-25T16:47:13Z → 1981-10-26T18:20:22Z" }, { "step": "kaala", "text": "Aruṇodaya is 2 muhūrtas before sunrise: 04:22–06:05 on the 26th, 04:22–06:05 on the 27th.", "fact": "arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during aruṇodaya. It covers 103 of 103 minutes on the 26th and 0 of 103 on the 27th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one dawn qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 28917 s" }, { "step": "ruling", "text": "Naraka Caturdaśī, Cairo, 1981: Monday 26 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "naraka-chaturdashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 14 Naraka caturdasi (covering a period of 4 ghatikas before sunrise, if occurs on two successive days, it is to be observed on the first day)" } ], "kaala": "arunodaya", "priority": "purvaviddha", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-26", "confidence": "determinate" } ], "quote": "In Cairo, Naraka Caturdaśī (Choti Diwali) 1981 falls on Monday 26 October. Caturdaśī runs from 18:47 on Sun 25 Oct to 20:20 on Mon 26 Oct and covers all of aruṇodaya that dawn.", "cite": "https://ahargana.org/cairo/festivals/1981/naraka-chaturdashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/kali-puja", "festival": "kali-puja", "name": "Kālī Pūjā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3709, "anga": { "type": "tithi", "index": 29, "key": "amavasya", "name": "Amāvasyā", "start": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 }, "end": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 }, "end": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 } }, "kaala": "nishita", "days": [ { "local_date": "1981-10-26", "window": { "start": { "local": "1981-10-26T23:15:10+02:00", "utc": "1981-10-26T21:15:10Z", "ms": 372978910420.1549 }, "end": { "local": "1981-10-27T00:03:10+02:00", "utc": "1981-10-26T22:03:10Z", "ms": 372981790420.1549 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-10-27", "window": { "start": { "local": "1981-10-27T23:15:05+02:00", "utc": "1981-10-27T21:15:05Z", "ms": 373065305041.27637 }, "end": { "local": "1981-10-28T00:03:05+02:00", "utc": "1981-10-27T22:03:05Z", "ms": 373068185041.27637 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Amāvasyā runs from 20:20 on Mon 26 Oct to 22:13 on Tue 27 Oct.", "fact": "1981-10-26T18:20:22Z → 1981-10-27T20:13:16Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:15–00:03 on the 26th, 23:15–00:03 on the 27th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Amāvasyā must be present during niśītha. It covers 48 of 48 minutes on the 26th and 0 of 48 on the 27th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 3709 s" }, { "step": "ruling", "text": "Kālī Pūjā, Cairo, 1981: Monday 26 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "kali-puja", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 30 Kali puja (nisithavyapini), Dipavali or Diwali (pradosa), Mahalaksmipuja (pradosa)" } ], "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-26", "confidence": "determinate" } ], "quote": "In Cairo, Kālī Pūjā 1981 falls on Monday 26 October. Amāvasyā runs from 20:20 on Mon 26 Oct to 22:13 on Tue 27 Oct and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/kali-puja", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/diwali-lakshmi-puja", "festival": "diwali-lakshmi-puja", "name": "Lakṣmī Pūjā", "everyday": "Diwali", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5059, "anga": { "type": "tithi", "index": 29, "key": "amavasya", "name": "Amāvasyā", "start": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 }, "end": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-26T20:20:22+02:00", "utc": "1981-10-26T18:20:22Z", "ms": 372968421698.4843 }, "end": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-10-26", "window": { "start": { "local": "1981-10-26T17:13:05+02:00", "utc": "1981-10-26T15:13:05Z", "ms": 372957185044.0425 }, "end": { "local": "1981-10-26T18:56:02+02:00", "utc": "1981-10-26T16:56:02Z", "ms": 372963362477.6725 } }, "covered_min": 0, "window_min": 103, "qualifies": false }, { "local_date": "1981-10-27", "window": { "start": { "local": "1981-10-27T17:12:10+02:00", "utc": "1981-10-27T15:12:10Z", "ms": 373043530035.23047 }, "end": { "local": "1981-10-27T18:55:21+02:00", "utc": "1981-10-27T16:55:21Z", "ms": 373049720703.50934 } }, "covered_min": 103, "window_min": 103, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Amāvasyā runs from 20:20 on Mon 26 Oct to 22:13 on Tue 27 Oct.", "fact": "1981-10-26T18:20:22Z → 1981-10-27T20:13:16Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:13–18:56 on the 26th, 17:12–18:55 on the 27th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Amāvasyā must be present during pradoṣa. It covers 0 of 103 minutes on the 26th and 103 of 103 on the 27th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 5059 s" }, { "step": "ruling", "text": "Lakṣmī Pūjā, Cairo, 1981: Tuesday 27 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "diwali-lakshmi-puja", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "K 30 Kali puja (nisithavyapini), Dipavali or Diwali (pradosa), Mahalaksmipuja (pradosa)" } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-27", "confidence": "determinate" } ], "quote": "In Cairo, Lakṣmī Pūjā (Diwali) 1981 falls on Tuesday 27 October. Amāvasyā runs from 20:20 on Mon 26 Oct to 22:13 on Tue 27 Oct and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/diwali-lakshmi-puja", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/govardhana-puja", "festival": "govardhana-puja", "name": "Govardhana Pūjā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36633, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "end": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "end": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-27", "window": { "start": { "local": "1981-10-27T11:14:43+02:00", "utc": "1981-10-27T09:14:43Z", "ms": 373022082915.7489 }, "end": { "local": "1981-10-27T12:02:43+02:00", "utc": "1981-10-27T10:02:43Z", "ms": 373024962915.7489 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-10-28", "window": { "start": { "local": "1981-10-28T11:14:38+02:00", "utc": "1981-10-28T09:14:38Z", "ms": 373108478081.1771 }, "end": { "local": "1981-10-28T12:02:38+02:00", "utc": "1981-10-28T10:02:38Z", "ms": 373111358081.1771 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 22:13 on Tue 27 Oct to 00:24 on Thu 29 Oct.", "fact": "1981-10-27T20:13:16Z → 1981-10-28T22:24:20Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 27th, 11:15–12:03 on the 28th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during madhyāhna. It covers 0 of 48 minutes on the 27th and 48 of 48 on the 28th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 36633 s" }, { "step": "ruling", "text": "Govardhana Pūjā, Cairo, 1981: Wednesday 28 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "govardhana-puja", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 1 Govardhana puja, Annakuta [purvaviddha], Balidaityaraja puja (pradosa), Dyuta pratipad (purvahna)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-28", "confidence": "determinate" } ], "quote": "In Cairo, Govardhana Pūjā 1981 falls on Wednesday 28 October. Pratipadā runs from 22:13 on Tue 27 Oct to 00:24 on Thu 29 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/govardhana-puja", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/bali-puja", "festival": "bali-puja", "name": "Bali Pūjā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11875, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "end": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "end": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-10-27", "window": { "start": { "local": "1981-10-27T17:12:10+02:00", "utc": "1981-10-27T15:12:10Z", "ms": 373043530035.23047 }, "end": { "local": "1981-10-27T18:55:21+02:00", "utc": "1981-10-27T16:55:21Z", "ms": 373049720703.50934 } }, "covered_min": 0, "window_min": 103, "qualifies": false }, { "local_date": "1981-10-28", "window": { "start": { "local": "1981-10-28T17:11:16+02:00", "utc": "1981-10-28T15:11:16Z", "ms": 373129876115.03204 }, "end": { "local": "1981-10-28T18:54:40+02:00", "utc": "1981-10-28T16:54:40Z", "ms": 373136079926.4696 } }, "covered_min": 103, "window_min": 103, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 22:13 on Tue 27 Oct to 00:24 on Thu 29 Oct.", "fact": "1981-10-27T20:13:16Z → 1981-10-28T22:24:20Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:12–18:55 on the 27th, 17:11–18:55 on the 28th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during pradoṣa. It covers 0 of 103 minutes on the 27th and 103 of 103 on the 28th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 11875 s" }, { "step": "ruling", "text": "Bali Pūjā, Cairo, 1981: Wednesday 28 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "bali-puja", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 1 Govardhana puja, Annakuta [purvaviddha], Balidaityaraja puja (pradosa), Dyuta pratipad (purvahna)." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-28", "confidence": "determinate" } ], "quote": "In Cairo, Bali Pūjā 1981 falls on Wednesday 28 October. Pratipadā runs from 22:13 on Tue 27 Oct to 00:24 on Thu 29 Oct and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/bali-puja", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/dyuta-pratipad", "festival": "dyuta-pratipad", "name": "Dyūta Pratipad", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20545, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "end": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-27T22:13:16+02:00", "utc": "1981-10-27T20:13:16Z", "ms": 373061596203.19244 }, "end": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 } }, "kaala": "purvahna", "days": [ { "local_date": "1981-10-28", "window": { "start": { "local": "1981-10-28T06:06:00+02:00", "utc": "1981-10-28T04:06:00Z", "ms": 373089960047.3222 }, "end": { "local": "1981-10-28T09:47:45+02:00", "utc": "1981-10-28T07:47:45Z", "ms": 373103265403.22546 } }, "covered_min": 222, "window_min": 222, "qualifies": true }, { "local_date": "1981-10-29", "window": { "start": { "local": "1981-10-29T06:06:45+02:00", "utc": "1981-10-29T04:06:45Z", "ms": 373176404700.81396 }, "end": { "local": "1981-10-29T09:47:58+02:00", "utc": "1981-10-29T07:47:58Z", "ms": 373189677570.17346 } }, "covered_min": 0, "window_min": 221, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 22:13 on Tue 27 Oct to 00:24 on Thu 29 Oct.", "fact": "1981-10-27T20:13:16Z → 1981-10-28T22:24:20Z" }, { "step": "kaala", "text": "Pūrvāhṇa is first 5 of 15 day muhūrtas: 06:06–09:48 on the 28th, 06:07–09:48 on the 29th.", "fact": "purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during pūrvāhṇa. It covers 222 of 222 minutes on the 28th and 0 of 221 on the 29th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one forenoon qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 20545 s" }, { "step": "ruling", "text": "Dyūta Pratipad, Cairo, 1981: Wednesday 28 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "dyuta-pratipad", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 1 Govardhana puja, Annakuta [purvaviddha], Balidaityaraja puja (pradosa), Dyuta pratipad (purvahna)." } ], "kaala": "purvahna", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-28", "confidence": "determinate" } ], "quote": "In Cairo, Dyūta Pratipad 1981 falls on Wednesday 28 October. Pratipadā runs from 22:13 on Tue 27 Oct to 00:24 on Thu 29 Oct and covers all of pūrvāhṇa that forenoon.", "cite": "https://ahargana.org/cairo/festivals/1981/dyuta-pratipad", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/yama-dvitiya", "festival": "yama-dvitiya", "name": "Yama Dvitīyā", "everyday": "Bhai Dooj", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30221, "anga": { "type": "tithi", "index": 1, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 }, "end": { "local": "1981-10-30T02:50:50+02:00", "utc": "1981-10-30T00:50:50Z", "ms": 373251050186.00385 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-29T00:24:20+02:00", "utc": "1981-10-28T22:24:20Z", "ms": 373155859951.86774 }, "end": { "local": "1981-10-30T02:50:50+02:00", "utc": "1981-10-30T00:50:50Z", "ms": 373251050186.00385 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-29", "window": { "start": { "local": "1981-10-29T11:14:34+02:00", "utc": "1981-10-29T09:14:34Z", "ms": 373194874004.8533 }, "end": { "local": "1981-10-29T12:02:34+02:00", "utc": "1981-10-29T10:02:34Z", "ms": 373197754004.8533 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-10-30", "window": { "start": { "local": "1981-10-30T11:14:31+02:00", "utc": "1981-10-30T09:14:31Z", "ms": 373281270695.22003 }, "end": { "local": "1981-10-30T12:02:31+02:00", "utc": "1981-10-30T10:02:31Z", "ms": 373284150695.22003 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 00:24 on Thu 29 Oct to 02:51 on Fri 30 Oct.", "fact": "1981-10-28T22:24:20Z → 1981-10-30T00:50:50Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 29th, 11:15–12:03 on the 30th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvitīyā must be present during madhyāhna. It covers 48 of 48 minutes on the 29th and 0 of 48 on the 30th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 30221 s" }, { "step": "ruling", "text": "Yama Dvitīyā, Cairo, 1981: Thursday 29 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "yama-dvitiya", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 2 Bhratrdvitiya, Yamadvitiya (madhyahna, purvaviddha), Masyadhara (Dwat) puja (Bihar)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-29", "confidence": "determinate" } ], "quote": "In Cairo, Yama Dvitīyā (Bhai Dooj) 1981 falls on Thursday 29 October. Dvitīyā runs from 00:24 on Thu 29 Oct to 02:51 on Fri 30 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/yama-dvitiya", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/naga-chaturthi", "festival": "naga-chaturthi", "name": "Nāga Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11177, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-10-31T05:27:59+02:00", "utc": "1981-10-31T03:27:59Z", "ms": 373346878507.825 }, "end": { "local": "1981-11-01T08:08:09+02:00", "utc": "1981-11-01T06:08:09Z", "ms": 373442889074.2237 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-31T05:27:59+02:00", "utc": "1981-10-31T03:27:59Z", "ms": 373346878507.825 }, "end": { "local": "1981-11-01T08:08:09+02:00", "utc": "1981-11-01T06:08:09Z", "ms": 373442889074.2237 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-31", "window": { "start": { "local": "1981-10-31T11:14:28+02:00", "utc": "1981-10-31T09:14:28Z", "ms": 373367668160.24945 }, "end": { "local": "1981-10-31T12:02:28+02:00", "utc": "1981-10-31T10:02:28Z", "ms": 373370548160.24945 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-11-01", "window": { "start": { "local": "1981-11-01T11:14:26+02:00", "utc": "1981-11-01T09:14:26Z", "ms": 373454066407.4098 }, "end": { "local": "1981-11-01T12:02:26+02:00", "utc": "1981-11-01T10:02:26Z", "ms": 373456946407.4098 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:28 on Sat 31 Oct to 08:08 on Sun 1 Nov.", "fact": "1981-10-31T03:27:59Z → 1981-11-01T06:08:09Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 31st, 11:14–12:02 on the 1st.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 31st and 0 of 48 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 11177 s" }, { "step": "ruling", "text": "Nāga Caturthī, Cairo, 1981: Saturday 31 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "naga-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 4 Naga caturthi (paraviddha and madhyahnavyapini)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-31", "confidence": "determinate" } ], "quote": "In Cairo, Nāga Caturthī 1981 falls on Saturday 31 October. Caturthī runs from 05:28 on Sat 31 Oct to 08:08 on Sun 1 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/naga-chaturthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-10-31", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-10-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11177, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-10-31T05:27:59+02:00", "utc": "1981-10-31T03:27:59Z", "ms": 373346878507.825 }, "end": { "local": "1981-11-01T08:08:09+02:00", "utc": "1981-11-01T06:08:09Z", "ms": 373442889074.2237 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-10-31T05:27:59+02:00", "utc": "1981-10-31T03:27:59Z", "ms": 373346878507.825 }, "end": { "local": "1981-11-01T08:08:09+02:00", "utc": "1981-11-01T06:08:09Z", "ms": 373442889074.2237 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-10-31", "window": { "start": { "local": "1981-10-31T11:14:28+02:00", "utc": "1981-10-31T09:14:28Z", "ms": 373367668160.24945 }, "end": { "local": "1981-10-31T12:02:28+02:00", "utc": "1981-10-31T10:02:28Z", "ms": 373370548160.24945 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-11-01", "window": { "start": { "local": "1981-11-01T11:14:26+02:00", "utc": "1981-11-01T09:14:26Z", "ms": 373454066407.4098 }, "end": { "local": "1981-11-01T12:02:26+02:00", "utc": "1981-11-01T10:02:26Z", "ms": 373456946407.4098 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:28 on Sat 31 Oct to 08:08 on Sun 1 Nov.", "fact": "1981-10-31T03:27:59Z → 1981-11-01T06:08:09Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 31st, 11:14–12:02 on the 1st.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 31st and 0 of 48 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 11177 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Saturday 31 October.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-10-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-10-31", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Saturday 31 October. Caturthī runs from 05:28 on Sat 31 Oct to 08:08 on Sun 1 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-10-31", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/surya-shashthi", "festival": "surya-shashthi", "name": "Sūrya Ṣaṣṭhī", "everyday": "Chhath", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-02", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 2009, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-11-02T10:40:56+02:00", "utc": "1981-11-02T08:40:56Z", "ms": 373538456005.62634 }, "end": { "local": "1981-11-03T12:53:55+02:00", "utc": "1981-11-03T10:53:55Z", "ms": 373632834771.22253 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-02T10:40:56+02:00", "utc": "1981-11-02T08:40:56Z", "ms": 373538456005.62634 }, "end": { "local": "1981-11-03T12:53:55+02:00", "utc": "1981-11-03T10:53:55Z", "ms": 373632834771.22253 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-11-02", "window": { "start": { "local": "1981-11-02T11:14:25+02:00", "utc": "1981-11-02T09:14:25Z", "ms": 373540465443.7766 }, "end": { "local": "1981-11-02T12:02:25+02:00", "utc": "1981-11-02T10:02:25Z", "ms": 373543345443.7766 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-11-03", "window": { "start": { "local": "1981-11-03T11:14:25+02:00", "utc": "1981-11-03T09:14:25Z", "ms": 373626865276.141 }, "end": { "local": "1981-11-03T12:02:25+02:00", "utc": "1981-11-03T10:02:25Z", "ms": 373629745276.141 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 10:41 on Mon 2 Nov to 12:54 on Tue 3 Nov.", "fact": "1981-11-02T08:40:56Z → 1981-11-03T10:53:55Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 2nd, 11:14–12:02 on the 3rd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 2nd and 48 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 2009 s" }, { "step": "ruling", "text": "Sūrya Ṣaṣṭhī, Cairo, 1981: Monday 2 November.", "fact": "confidence: boundary (tie-break-unstated)" } ], "rule": { "kind": "lunar", "id": "surya-shashthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 6 Nadi sasthi, Skanda sasthi (Madras), Surya sasthi, Chhat (Bihar)." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-02", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-03", "confidence": "boundary" } ], "quote": "In Cairo, Sūrya Ṣaṣṭhī (Chhath) 1981 falls on Monday 2 November. Ṣaṣṭhī runs from 10:41 on Mon 2 Nov to 12:54 on Tue 3 Nov and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.", "cite": "https://ahargana.org/cairo/festivals/1981/surya-shashthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/gopashtami", "festival": "gopashtami", "name": "Gopāṣṭamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9118, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "1981-11-04T14:34:24+02:00", "utc": "1981-11-04T12:34:24Z", "ms": 373725263750.8933 }, "end": { "local": "1981-11-05T15:31:29+02:00", "utc": "1981-11-05T13:31:29Z", "ms": 373815088626.5321 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-04T14:34:24+02:00", "utc": "1981-11-04T12:34:24Z", "ms": 373725263750.8933 }, "end": { "local": "1981-11-05T15:31:29+02:00", "utc": "1981-11-05T13:31:29Z", "ms": 373815088626.5321 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-11-04", "window": { "start": { "local": "1981-11-04T11:14:26+02:00", "utc": "1981-11-04T09:14:26Z", "ms": 373713265910.8321 }, "end": { "local": "1981-11-04T12:02:26+02:00", "utc": "1981-11-04T10:02:26Z", "ms": 373716145910.8321 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-11-05", "window": { "start": { "local": "1981-11-05T11:14:27+02:00", "utc": "1981-11-05T09:14:27Z", "ms": 373799667353.8607 }, "end": { "local": "1981-11-05T12:02:27+02:00", "utc": "1981-11-05T10:02:27Z", "ms": 373802547353.8607 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 14:34 on Wed 4 Nov to 15:31 on Thu 5 Nov.", "fact": "1981-11-04T12:34:24Z → 1981-11-05T13:31:29Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 4th, 11:14–12:02 on the 5th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during madhyāhna. It covers 0 of 48 minutes on the 4th and 48 of 48 on the 5th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 9118 s" }, { "step": "ruling", "text": "Gopāṣṭamī, Cairo, 1981: Thursday 5 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "gopashtami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 8 Gopastami, Gosthastami." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-05", "confidence": "determinate" } ], "quote": "In Cairo, Gopāṣṭamī 1981 falls on Thursday 5 November. Aṣṭamī runs from 14:34 on Wed 4 Nov to 15:31 on Thu 5 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/gopashtami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/akshaya-navami", "festival": "akshaya-navami", "name": "Akṣaya Navamī", "everyday": "Amla Navami", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20508, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "1981-11-05T15:31:29+02:00", "utc": "1981-11-05T13:31:29Z", "ms": 373815088626.5321 }, "end": { "local": "1981-11-06T15:37:49+02:00", "utc": "1981-11-06T13:37:49Z", "ms": 373901869303.164 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-05T15:31:29+02:00", "utc": "1981-11-05T13:31:29Z", "ms": 373815088626.5321 }, "end": { "local": "1981-11-06T15:37:49+02:00", "utc": "1981-11-06T13:37:49Z", "ms": 373901869303.164 } }, "kaala": "purvahna", "days": [ { "local_date": "1981-11-05", "window": { "start": { "local": "1981-11-05T06:12:08+02:00", "utc": "1981-11-05T04:12:08Z", "ms": 373781527713.6641 }, "end": { "local": "1981-11-05T09:49:41+02:00", "utc": "1981-11-05T07:49:41Z", "ms": 373794580807.12854 } }, "covered_min": 0, "window_min": 218, "qualifies": false }, { "local_date": "1981-11-06", "window": { "start": { "local": "1981-11-06T06:12:55+02:00", "utc": "1981-11-06T04:12:55Z", "ms": 373867975206.003 }, "end": { "local": "1981-11-06T09:49:58+02:00", "utc": "1981-11-06T07:49:58Z", "ms": 373880998142.67426 } }, "covered_min": 217, "window_min": 217, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Navamī runs from 15:31 on Thu 5 Nov to 15:38 on Fri 6 Nov.", "fact": "1981-11-05T13:31:29Z → 1981-11-06T13:37:49Z" }, { "step": "kaala", "text": "Pūrvāhṇa is first 5 of 15 day muhūrtas: 06:12–09:50 on the 5th, 06:13–09:50 on the 6th.", "fact": "purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Navamī must be present during pūrvāhṇa. It covers 0 of 218 minutes on the 5th and 217 of 217 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one forenoon qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 20508 s" }, { "step": "ruling", "text": "Akṣaya Navamī, Cairo, 1981: Friday 6 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "akshaya-navami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 9 Aksaya navami (purvahnavyapini), Jagaddhatri puja (Bengal), (udayavyapini one muhurta), Anla navami (Orissa), Durga navami (purvaviddha), Gauri vrata." } ], "kaala": "purvahna", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-06", "confidence": "determinate" } ], "quote": "In Cairo, Akṣaya Navamī (Amla Navami) 1981 falls on Friday 6 November. Navamī runs from 15:31 on Thu 5 Nov to 15:38 on Fri 6 Nov and covers all of pūrvāhṇa that forenoon.", "cite": "https://ahargana.org/cairo/festivals/1981/akshaya-navami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/durga-navami", "festival": "durga-navami", "name": "Durgā Navamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12541, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "1981-11-05T15:31:29+02:00", "utc": "1981-11-05T13:31:29Z", "ms": 373815088626.5321 }, "end": { "local": "1981-11-06T15:37:49+02:00", "utc": "1981-11-06T13:37:49Z", "ms": 373901869303.164 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-05T15:31:29+02:00", "utc": "1981-11-05T13:31:29Z", "ms": 373815088626.5321 }, "end": { "local": "1981-11-06T15:37:49+02:00", "utc": "1981-11-06T13:37:49Z", "ms": 373901869303.164 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-11-05", "window": { "start": { "local": "1981-11-05T11:14:27+02:00", "utc": "1981-11-05T09:14:27Z", "ms": 373799667353.8607 }, "end": { "local": "1981-11-05T12:02:27+02:00", "utc": "1981-11-05T10:02:27Z", "ms": 373802547353.8607 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-11-06", "window": { "start": { "local": "1981-11-06T11:14:30+02:00", "utc": "1981-11-06T09:14:30Z", "ms": 373886069611.0099 }, "end": { "local": "1981-11-06T12:02:30+02:00", "utc": "1981-11-06T10:02:30Z", "ms": 373888949611.0099 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Navamī runs from 15:31 on Thu 5 Nov to 15:38 on Fri 6 Nov.", "fact": "1981-11-05T13:31:29Z → 1981-11-06T13:37:49Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 5th, 11:14–12:02 on the 6th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Navamī must be present during madhyāhna. It covers 0 of 48 minutes on the 5th and 48 of 48 on the 6th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 12541 s" }, { "step": "ruling", "text": "Durgā Navamī, Cairo, 1981: Friday 6 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "durga-navami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 9 Aksaya navami (purvahnavyapini), Jagaddhatri puja (Bengal), (udayavyapini one muhurta), Anla navami (Orissa), Durga navami (purvaviddha), Gauri vrata." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-06", "confidence": "determinate" } ], "quote": "In Cairo, Durgā Navamī 1981 falls on Friday 6 November. Navamī runs from 15:31 on Thu 5 Nov to 15:38 on Fri 6 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/durga-navami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-11-08", "festival": "ekadashi", "name": "Prabodhinī Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25027, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-11-07T14:50:38+02:00", "utc": "1981-11-07T12:50:38Z", "ms": 373985437639.2032 }, "end": { "local": "1981-11-08T13:11:38+02:00", "utc": "1981-11-08T11:11:38Z", "ms": 374065898309.86774 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-07T14:50:38+02:00", "utc": "1981-11-07T12:50:38Z", "ms": 373985437639.2032 }, "end": { "local": "1981-11-08T13:11:38+02:00", "utc": "1981-11-08T11:11:38Z", "ms": 374065898309.86774 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-11-07", "window": { "start": { "local": "1981-11-07T06:13:43+02:00", "utc": "1981-11-07T04:13:43Z", "ms": 373954422994.24335 }, "end": { "local": "1981-11-07T06:13:43+02:00", "utc": "1981-11-07T04:13:43Z", "ms": 373954422994.24335 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-11-08", "window": { "start": { "local": "1981-11-08T06:14:31+02:00", "utc": "1981-11-08T04:14:31Z", "ms": 374040871063.7947 }, "end": { "local": "1981-11-08T06:14:31+02:00", "utc": "1981-11-08T04:14:31Z", "ms": 374040871063.7947 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 14:51 on Sat 7 Nov to 13:12 on Sun 8 Nov.", "fact": "1981-11-07T12:50:38Z → 1981-11-08T11:11:38Z" }, { "step": "kaala", "text": "Sunrise is at 06:14 on the 7th and 06:15 on the 8th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 7th and is on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 25027 s" }, { "step": "ruling", "text": "Prabodhinī Ekādaśī, Cairo, 1981: Sunday 8 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-08", "confidence": "determinate" } ], "quote": "In Cairo, Prabodhinī Ekādaśī 1981 falls on Sunday 8 November. Ekādaśī runs from 14:51 on Sat 7 Nov to 13:12 on Sun 8 Nov and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-11-08", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-11-09", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22536, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-11-09T10:46:27+02:00", "utc": "1981-11-09T08:46:27Z", "ms": 374143587343.6004 }, "end": { "local": "1981-11-10T07:43:31+02:00", "utc": "1981-11-10T05:43:31Z", "ms": 374219011447.3523 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-09T10:46:27+02:00", "utc": "1981-11-09T08:46:27Z", "ms": 374143587343.6004 }, "end": { "local": "1981-11-10T07:43:31+02:00", "utc": "1981-11-10T05:43:31Z", "ms": 374219011447.3523 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-11-09", "window": { "start": { "local": "1981-11-09T17:02:03+02:00", "utc": "1981-11-09T15:02:03Z", "ms": 374166123248.72815 }, "end": { "local": "1981-11-09T18:47:56+02:00", "utc": "1981-11-09T16:47:56Z", "ms": 374172475880.83875 } }, "covered_min": 106, "window_min": 106, "qualifies": true }, { "local_date": "1981-11-10", "window": { "start": { "local": "1981-11-10T17:01:26+02:00", "utc": "1981-11-10T15:01:26Z", "ms": 374252485802.8874 }, "end": { "local": "1981-11-10T18:47:30+02:00", "utc": "1981-11-10T16:47:30Z", "ms": 374258849938.2452 } }, "covered_min": 0, "window_min": 106, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 10:46 on Mon 9 Nov to 07:44 on Tue 10 Nov.", "fact": "1981-11-09T08:46:27Z → 1981-11-10T05:43:31Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:02–18:48 on the 9th, 17:01–18:47 on the 10th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 106 of 106 minutes on the 9th and 0 of 106 on the 10th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 22536 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Monday 9 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-09", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Monday 9 November. Trayodaśī runs from 10:46 on Mon 9 Nov to 07:44 on Tue 10 Nov and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-11-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/kartiki-purnima", "festival": "kartiki-purnima", "name": "Kārtikī Pūrṇimā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25306, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-11-11T04:13:07+02:00", "utc": "1981-11-11T02:13:07Z", "ms": 374292787116.7033 }, "end": { "local": "1981-11-12T00:26:29+02:00", "utc": "1981-11-11T22:26:29Z", "ms": 374365589316.83636 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-11T04:13:07+02:00", "utc": "1981-11-11T02:13:07Z", "ms": 374292787116.7033 }, "end": { "local": "1981-11-12T00:26:29+02:00", "utc": "1981-11-11T22:26:29Z", "ms": 374365589316.83636 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-11-11", "window": { "start": { "local": "1981-11-11T11:14:53+02:00", "utc": "1981-11-11T09:14:53Z", "ms": 374318093312.0752 }, "end": { "local": "1981-11-11T12:02:53+02:00", "utc": "1981-11-11T10:02:53Z", "ms": 374320973312.0752 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-11-12", "window": { "start": { "local": "1981-11-12T11:15:01+02:00", "utc": "1981-11-12T09:15:01Z", "ms": 374404500578.3004 }, "end": { "local": "1981-11-12T12:03:01+02:00", "utc": "1981-11-12T10:03:01Z", "ms": 374407380578.3004 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 04:13 on Wed 11 Nov to 00:26 on Thu 12 Nov.", "fact": "1981-11-11T02:13:07Z → 1981-11-11T22:26:29Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 11th, 11:15–12:03 on the 12th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 11th and 0 of 48 on the 12th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 25306 s" }, { "step": "ruling", "text": "Kārtikī Pūrṇimā, Cairo, 1981: Wednesday 11 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "kartiki-purnima", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Rasayatra, (nisithavyapini, i.e. covering a period from 24 minutes before to 24 minutes after midnight. If occurs on two days or does not occur on any day, it is to be observed on the second day), Puskar Fair. Ratha yatra (Jain), Tripurotsava (evening), Kedara vrata (Orissa), Kartiki purnima." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-11", "confidence": "determinate" } ], "quote": "In Cairo, Kārtikī Pūrṇimā 1981 falls on Wednesday 11 November. Pūrṇimā runs from 04:13 on Wed 11 Nov to 00:26 on Thu 12 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/kartiki-purnima", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/rasayatra", "festival": "rasayatra", "name": "Rāsayātrā", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1391, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-11-11T04:13:07+02:00", "utc": "1981-11-11T02:13:07Z", "ms": 374292787116.7033 }, "end": { "local": "1981-11-12T00:26:29+02:00", "utc": "1981-11-11T22:26:29Z", "ms": 374365589316.83636 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "1981-11-11T04:13:07+02:00", "utc": "1981-11-11T02:13:07Z", "ms": 374292787116.7033 }, "end": { "local": "1981-11-12T00:26:29+02:00", "utc": "1981-11-11T22:26:29Z", "ms": 374365589316.83636 } }, "kaala": "nishita", "days": [ { "local_date": "1981-11-10", "window": { "start": { "local": "1981-11-10T23:15:11+02:00", "utc": "1981-11-10T21:15:11Z", "ms": 374274911310.479 }, "end": { "local": "1981-11-11T00:03:11+02:00", "utc": "1981-11-10T22:03:11Z", "ms": 374277791310.479 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-11-11", "window": { "start": { "local": "1981-11-11T23:15:18+02:00", "utc": "1981-11-11T21:15:18Z", "ms": 374361317839.0813 }, "end": { "local": "1981-11-12T00:03:18+02:00", "utc": "1981-11-11T22:03:18Z", "ms": 374364197839.0813 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 04:13 on Wed 11 Nov to 00:26 on Thu 12 Nov.", "fact": "1981-11-11T02:13:07Z → 1981-11-11T22:26:29Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:15–00:03 on the 10th, 23:15–00:03 on the 11th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during niśītha. It covers 0 of 48 minutes on the 10th and 48 of 48 on the 11th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 1391 s" }, { "step": "ruling", "text": "Rāsayātrā, Cairo, 1981: Wednesday 11 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "rasayatra", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Rasayatra, (nisithavyapini, i.e. covering a period from 24 minutes before to 24 minutes after midnight. If occurs on two days or does not occur on any day, it is to be observed on the second day), Puskar Fair. Ratha yatra (Jain), Tripurotsava (evening), Kedara vrata (Orissa), Kartiki purnima." } ], "kaala": "nishita", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-11", "confidence": "determinate" } ], "quote": "In Cairo, Rāsayātrā 1981 falls on Wednesday 11 November. Pūrṇimā runs from 04:13 on Wed 11 Nov to 00:26 on Thu 12 Nov and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/rasayatra", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-11-14", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22483, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-11-14T13:23:14+02:00", "utc": "1981-11-14T11:23:14Z", "ms": 374584994369.12 }, "end": { "local": "1981-11-15T10:22:43+02:00", "utc": "1981-11-15T08:22:43Z", "ms": 374660562791.789 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-11-14T13:23:14+02:00", "utc": "1981-11-14T11:23:14Z", "ms": 374584994369.12 }, "end": { "local": "1981-11-15T10:22:43+02:00", "utc": "1981-11-15T08:22:43Z", "ms": 374660562791.789 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-11-14", "window": { "start": { "local": "1981-11-14T19:37:57+02:00", "utc": "1981-11-14T17:37:57Z", "ms": 374607477157.6924 }, "end": { "local": "1981-11-14T19:37:57+02:00", "utc": "1981-11-14T17:37:57Z", "ms": 374607477157.6924 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-11-15", "window": { "start": { "local": "1981-11-15T20:38:48+02:00", "utc": "1981-11-15T18:38:48Z", "ms": 374697528299.0014 }, "end": { "local": "1981-11-15T20:38:48+02:00", "utc": "1981-11-15T18:38:48Z", "ms": 374697528299.0014 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 13:23 on Sat 14 Nov to 10:23 on Sun 15 Nov.", "fact": "1981-11-14T11:23:14Z → 1981-11-15T08:22:43Z" }, { "step": "kaala", "text": "Moonrise is at 19:38 on the 14th and 20:39 on the 15th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 14th and is not on the 15th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 22483 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Saturday 14 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-14", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Saturday 14 November. Caturthī runs from 13:23 on Sat 14 Nov to 10:23 on Sun 15 Nov and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-11-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-11-22", "festival": "ekadashi", "name": "Utpannā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 975, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-11-21T06:08:59+02:00", "utc": "1981-11-21T04:08:59Z", "ms": 375163739180.96686 }, "end": { "local": "1981-11-22T07:37:09+02:00", "utc": "1981-11-22T05:37:09Z", "ms": 375255428815.07294 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-11-21T06:08:59+02:00", "utc": "1981-11-21T04:08:59Z", "ms": 375163739180.96686 }, "end": { "local": "1981-11-22T07:37:09+02:00", "utc": "1981-11-22T05:37:09Z", "ms": 375255428815.07294 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-11-21", "window": { "start": { "local": "1981-11-21T06:25:14+02:00", "utc": "1981-11-21T04:25:14Z", "ms": 375164714396.448 }, "end": { "local": "1981-11-21T06:25:14+02:00", "utc": "1981-11-21T04:25:14Z", "ms": 375164714396.448 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-11-22", "window": { "start": { "local": "1981-11-22T06:26:05+02:00", "utc": "1981-11-22T04:26:05Z", "ms": 375251164536.2421 }, "end": { "local": "1981-11-22T06:26:05+02:00", "utc": "1981-11-22T04:26:05Z", "ms": 375251164536.2421 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "paraviddha", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 06:09 on Sat 21 Nov to 07:37 on Sun 22 Nov.", "fact": "1981-11-21T04:08:59Z → 1981-11-22T05:37:09Z" }, { "step": "kaala", "text": "Sunrise is at 06:25 on the 21st and 06:26 on the 22nd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 21st and is on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Both sunrises qualify. Paraviddhā: the second is taken.", "fact": "priority: paraviddha → paraviddha · margin 975 s" }, { "step": "ruling", "text": "Utpannā Ekādaśī, Cairo, 1981: Sunday 22 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-22", "confidence": "determinate" } ], "quote": "In Cairo, Utpannā Ekādaśī 1981 falls on Sunday 22 November. Ekādaśī runs from 06:09 on Sat 21 Nov to 07:37 on Sun 22 Nov and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-11-22", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-11-23", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18904, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-11-23T09:29:29+02:00", "utc": "1981-11-23T07:29:29Z", "ms": 375348569410.1628 }, "end": { "local": "1981-11-24T11:40:21+02:00", "utc": "1981-11-24T09:40:21Z", "ms": 375442820577.5106 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-11-23T09:29:29+02:00", "utc": "1981-11-23T07:29:29Z", "ms": 375348569410.1628 }, "end": { "local": "1981-11-24T11:40:21+02:00", "utc": "1981-11-24T09:40:21Z", "ms": 375442820577.5106 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-11-23", "window": { "start": { "local": "1981-11-23T16:55:39+02:00", "utc": "1981-11-23T14:55:39Z", "ms": 375375339345.0416 }, "end": { "local": "1981-11-23T18:43:56+02:00", "utc": "1981-11-23T16:43:56Z", "ms": 375381836045.8423 } }, "covered_min": 108, "window_min": 108, "qualifies": true }, { "local_date": "1981-11-24", "window": { "start": { "local": "1981-11-24T16:55:24+02:00", "utc": "1981-11-24T14:55:24Z", "ms": 375461724135.11224 }, "end": { "local": "1981-11-24T18:43:50+02:00", "utc": "1981-11-24T16:43:50Z", "ms": 375468229510.2871 } }, "covered_min": 0, "window_min": 108, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 09:29 on Mon 23 Nov to 11:40 on Tue 24 Nov.", "fact": "1981-11-23T07:29:29Z → 1981-11-24T09:40:21Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 16:56–18:44 on the 23rd, 16:55–18:44 on the 24th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 108 of 108 minutes on the 23rd and 0 of 108 on the 24th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 18904 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Monday 23 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-23", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Monday 23 November. Trayodaśī runs from 09:29 on Mon 23 Nov to 11:40 on Tue 24 Nov and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-11-23", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-11-24", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33212, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-11-24T11:40:21+02:00", "utc": "1981-11-24T09:40:21Z", "ms": 375442820577.5106 }, "end": { "local": "1981-11-25T14:04:46+02:00", "utc": "1981-11-25T12:04:46Z", "ms": 375537885858.6212 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-11-24T11:40:21+02:00", "utc": "1981-11-24T09:40:21Z", "ms": 375442820577.5106 }, "end": { "local": "1981-11-25T14:04:46+02:00", "utc": "1981-11-25T12:04:46Z", "ms": 375537885858.6212 } }, "kaala": "nishita", "days": [ { "local_date": "1981-11-24", "window": { "start": { "local": "1981-11-24T23:17:59+02:00", "utc": "1981-11-24T21:17:59Z", "ms": 375484679292.0179 }, "end": { "local": "1981-11-25T00:05:59+02:00", "utc": "1981-11-24T22:05:59Z", "ms": 375487559292.0179 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-11-25", "window": { "start": { "local": "1981-11-25T23:18:17+02:00", "utc": "1981-11-25T21:18:17Z", "ms": 375571097369.4789 }, "end": { "local": "1981-11-26T00:06:17+02:00", "utc": "1981-11-25T22:06:17Z", "ms": 375573977369.4789 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 11:40 on Tue 24 Nov to 14:05 on Wed 25 Nov.", "fact": "1981-11-24T09:40:21Z → 1981-11-25T12:04:46Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:18–00:06 on the 24th, 23:18–00:06 on the 25th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 24th and 0 of 48 on the 25th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 33212 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Tuesday 24 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-24", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Tuesday 24 November. Caturdaśī runs from 11:40 on Tue 24 Nov to 14:05 on Wed 25 Nov and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-11-24", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-11-30", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-11-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 31207, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-11-30T00:24:43+02:00", "utc": "1981-11-29T22:24:43Z", "ms": 375920682799.7265 }, "end": { "local": "1981-12-01T02:39:50+02:00", "utc": "1981-12-01T00:39:50Z", "ms": 376015189856.88855 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-11-30T00:24:43+02:00", "utc": "1981-11-29T22:24:43Z", "ms": 375920682799.7265 }, "end": { "local": "1981-12-01T02:39:50+02:00", "utc": "1981-12-01T00:39:50Z", "ms": 376015189856.88855 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-11-30", "window": { "start": { "local": "1981-11-30T11:19:34+02:00", "utc": "1981-11-30T09:19:34Z", "ms": 375959974387.8794 }, "end": { "local": "1981-11-30T12:07:34+02:00", "utc": "1981-11-30T10:07:34Z", "ms": 375962854387.8794 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-12-01", "window": { "start": { "local": "1981-12-01T11:19:57+02:00", "utc": "1981-12-01T09:19:57Z", "ms": 376046396816.30786 }, "end": { "local": "1981-12-01T12:07:57+02:00", "utc": "1981-12-01T10:07:57Z", "ms": 376049276816.30786 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 00:25 on Mon 30 Nov to 02:40 on Tue 1 Dec.", "fact": "1981-11-29T22:24:43Z → 1981-12-01T00:39:50Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 30th, 11:20–12:08 on the 1st.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 30th and 0 of 48 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 31207 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Monday 30 November.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-11-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-11-30", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Monday 30 November. Caturthī runs from 00:25 on Mon 30 Nov to 02:40 on Tue 1 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-11-30", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/naga-panchami-margashirsha", "festival": "naga-panchami-margashirsha", "name": "Nāga Pañcamī (Mārgaśīrṣa)", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24597, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "1981-12-01T02:39:50+02:00", "utc": "1981-12-01T00:39:50Z", "ms": 376015189856.88855 }, "end": { "local": "1981-12-02T04:30:23+02:00", "utc": "1981-12-02T02:30:23Z", "ms": 376108223046.49054 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-01T02:39:50+02:00", "utc": "1981-12-01T00:39:50Z", "ms": 376015189856.88855 }, "end": { "local": "1981-12-02T04:30:23+02:00", "utc": "1981-12-02T02:30:23Z", "ms": 376108223046.49054 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-12-01", "window": { "start": { "local": "1981-12-01T11:19:57+02:00", "utc": "1981-12-01T09:19:57Z", "ms": 376046396816.30786 }, "end": { "local": "1981-12-01T12:07:57+02:00", "utc": "1981-12-01T10:07:57Z", "ms": 376049276816.30786 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-12-02", "window": { "start": { "local": "1981-12-02T11:20:20+02:00", "utc": "1981-12-02T09:20:20Z", "ms": 376132819876.9353 }, "end": { "local": "1981-12-02T12:08:20+02:00", "utc": "1981-12-02T10:08:20Z", "ms": 376135699876.9353 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 02:40 on Tue 1 Dec to 04:30 on Wed 2 Dec.", "fact": "1981-12-01T00:39:50Z → 1981-12-02T02:30:23Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 1st, 11:20–12:08 on the 2nd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pañcamī must be present during madhyāhna. It covers 48 of 48 minutes on the 1st and 0 of 48 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 24597 s" }, { "step": "ruling", "text": "Nāga Pañcamī (Mārgaśīrṣa), Cairo, 1981: Tuesday 1 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "naga-panchami-margashirsha", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 5 Naga pancami (2nd) (paraviddha)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-01", "confidence": "determinate" } ], "quote": "In Cairo, Nāga Pañcamī (Mārgaśīrṣa) 1981 falls on Tuesday 1 December. Pañcamī runs from 02:40 on Tue 1 Dec to 04:30 on Wed 2 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/naga-panchami-margashirsha", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/champa-shashthi", "festival": "champa-shashthi", "name": "Campā Ṣaṣṭhī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20016, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-12-02T04:30:23+02:00", "utc": "1981-12-02T02:30:23Z", "ms": 376108223046.49054 }, "end": { "local": "1981-12-03T05:47:07+02:00", "utc": "1981-12-03T03:47:07Z", "ms": 376199227304.56415 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-02T04:30:23+02:00", "utc": "1981-12-02T02:30:23Z", "ms": 376108223046.49054 }, "end": { "local": "1981-12-03T05:47:07+02:00", "utc": "1981-12-03T03:47:07Z", "ms": 376199227304.56415 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-12-02", "window": { "start": { "local": "1981-12-02T11:20:20+02:00", "utc": "1981-12-02T09:20:20Z", "ms": 376132819876.9353 }, "end": { "local": "1981-12-02T12:08:20+02:00", "utc": "1981-12-02T10:08:20Z", "ms": 376135699876.9353 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-12-03", "window": { "start": { "local": "1981-12-03T11:20:44+02:00", "utc": "1981-12-03T09:20:44Z", "ms": 376219243545.1904 }, "end": { "local": "1981-12-03T12:08:44+02:00", "utc": "1981-12-03T10:08:44Z", "ms": 376222123545.1904 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 04:30 on Wed 2 Dec to 05:47 on Thu 3 Dec.", "fact": "1981-12-02T02:30:23Z → 1981-12-03T03:47:07Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 2nd, 11:21–12:09 on the 3rd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 2nd and 0 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 20016 s" }, { "step": "ruling", "text": "Campā Ṣaṣṭhī, Cairo, 1981: Wednesday 2 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "champa-shashthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 6 Campa sasthi (Maharashtra) (paraviddha). (Special when combined with naksatra Satabhisaj, yoga Vyatipata and Sunday), Skanda sasthi (purvaviddha), Guha sasthi" } ], "not_evaluated": "The row calls the day special with Śatabhiṣaj nakṣatra, Vyatīpāta yoga and a Sunday; none is tested.", "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-02", "confidence": "determinate" } ], "quote": "In Cairo, Campā Ṣaṣṭhī 1981 falls on Wednesday 2 December. Ṣaṣṭhī runs from 04:30 on Wed 2 Dec to 05:47 on Thu 3 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/champa-shashthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/skanda-shashthi", "festival": "skanda-shashthi", "name": "Skanda Ṣaṣṭhī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20016, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "1981-12-02T04:30:23+02:00", "utc": "1981-12-02T02:30:23Z", "ms": 376108223046.49054 }, "end": { "local": "1981-12-03T05:47:07+02:00", "utc": "1981-12-03T03:47:07Z", "ms": 376199227304.56415 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-02T04:30:23+02:00", "utc": "1981-12-02T02:30:23Z", "ms": 376108223046.49054 }, "end": { "local": "1981-12-03T05:47:07+02:00", "utc": "1981-12-03T03:47:07Z", "ms": 376199227304.56415 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-12-02", "window": { "start": { "local": "1981-12-02T11:20:20+02:00", "utc": "1981-12-02T09:20:20Z", "ms": 376132819876.9353 }, "end": { "local": "1981-12-02T12:08:20+02:00", "utc": "1981-12-02T10:08:20Z", "ms": 376135699876.9353 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-12-03", "window": { "start": { "local": "1981-12-03T11:20:44+02:00", "utc": "1981-12-03T09:20:44Z", "ms": 376219243545.1904 }, "end": { "local": "1981-12-03T12:08:44+02:00", "utc": "1981-12-03T10:08:44Z", "ms": 376222123545.1904 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 04:30 on Wed 2 Dec to 05:47 on Thu 3 Dec.", "fact": "1981-12-02T02:30:23Z → 1981-12-03T03:47:07Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 2nd, 11:21–12:09 on the 3rd.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 2nd and 0 of 48 on the 3rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 20016 s" }, { "step": "ruling", "text": "Skanda Ṣaṣṭhī, Cairo, 1981: Wednesday 2 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "skanda-shashthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 6 Campa sasthi (Maharashtra) (paraviddha). (Special when combined with naksatra Satabhisaj, yoga Vyatipata and Sunday), Skanda sasthi (purvaviddha), Guha sasthi" } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-02", "confidence": "determinate" } ], "quote": "In Cairo, Skanda Ṣaṣṭhī 1981 falls on Wednesday 2 December. Ṣaṣṭhī runs from 04:30 on Wed 2 Dec to 05:47 on Thu 3 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/skanda-shashthi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/mitra-saptami", "festival": "mitra-saptami", "name": "Mitra Saptamī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17940, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "1981-12-03T05:47:07+02:00", "utc": "1981-12-03T03:47:07Z", "ms": 376199227304.56415 }, "end": { "local": "1981-12-04T06:22:08+02:00", "utc": "1981-12-04T04:22:08Z", "ms": 376287728077.0888 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-03T05:47:07+02:00", "utc": "1981-12-03T03:47:07Z", "ms": 376199227304.56415 }, "end": { "local": "1981-12-04T06:22:08+02:00", "utc": "1981-12-04T04:22:08Z", "ms": 376287728077.0888 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-12-03", "window": { "start": { "local": "1981-12-03T11:20:44+02:00", "utc": "1981-12-03T09:20:44Z", "ms": 376219243545.1904 }, "end": { "local": "1981-12-03T12:08:44+02:00", "utc": "1981-12-03T10:08:44Z", "ms": 376222123545.1904 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "1981-12-04", "window": { "start": { "local": "1981-12-04T11:21:08+02:00", "utc": "1981-12-04T09:21:08Z", "ms": 376305667795.9684 }, "end": { "local": "1981-12-04T12:09:08+02:00", "utc": "1981-12-04T10:09:08Z", "ms": 376308547795.9684 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 05:47 on Thu 3 Dec to 06:22 on Fri 4 Dec.", "fact": "1981-12-03T03:47:07Z → 1981-12-04T04:22:08Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:21–12:09 on the 3rd, 11:21–12:09 on the 4th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during madhyāhna. It covers 48 of 48 minutes on the 3rd and 0 of 48 on the 4th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 17940 s" }, { "step": "ruling", "text": "Mitra Saptamī, Cairo, 1981: Thursday 3 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "mitra-saptami", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 7 Mitra saptami (purvaviddha)." } ], "kaala": "madhyahna", "priority": "purvaviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-03", "confidence": "determinate" } ], "quote": "In Cairo, Mitra Saptamī 1981 falls on Thursday 3 December. Saptamī runs from 05:47 on Thu 3 Dec to 06:22 on Fri 4 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/mitra-saptami", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-12-07", "festival": "ekadashi", "name": "Mokṣadā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11809, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-12-07T03:21:18+02:00", "utc": "1981-12-07T01:21:18Z", "ms": 376536077658.26056 }, "end": { "local": "1981-12-08T00:51:09+02:00", "utc": "1981-12-07T22:51:09Z", "ms": 376613469314.172 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-07T03:21:18+02:00", "utc": "1981-12-07T01:21:18Z", "ms": 376536077658.26056 }, "end": { "local": "1981-12-08T00:51:09+02:00", "utc": "1981-12-07T22:51:09Z", "ms": 376613469314.172 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-12-07", "window": { "start": { "local": "1981-12-07T06:38:06+02:00", "utc": "1981-12-07T04:38:06Z", "ms": 376547886398.1876 }, "end": { "local": "1981-12-07T06:38:06+02:00", "utc": "1981-12-07T04:38:06Z", "ms": 376547886398.1876 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-12-08", "window": { "start": { "local": "1981-12-08T06:38:51+02:00", "utc": "1981-12-08T04:38:51Z", "ms": 376634330527.98895 }, "end": { "local": "1981-12-08T06:38:51+02:00", "utc": "1981-12-08T04:38:51Z", "ms": 376634330527.98895 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 03:21 on Mon 7 Dec to 00:51 on Tue 8 Dec.", "fact": "1981-12-07T01:21:18Z → 1981-12-07T22:51:09Z" }, { "step": "kaala", "text": "Sunrise is at 06:38 on the 7th and 06:39 on the 8th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 7th and is not on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 11809 s" }, { "step": "ruling", "text": "Mokṣadā Ekādaśī, Cairo, 1981: Monday 7 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-07", "confidence": "determinate" } ], "quote": "In Cairo, Mokṣadā Ekādaśī 1981 falls on Monday 7 December. Ekādaśī runs from 03:21 on Mon 7 Dec to 00:51 on Tue 8 Dec and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-12-07", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/akhanda-dvadashi", "festival": "akhanda-dvadashi", "name": "Akhaṇḍa Dvādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34531, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "1981-12-08T00:51:09+02:00", "utc": "1981-12-07T22:51:09Z", "ms": 376613469314.172 }, "end": { "local": "1981-12-08T21:46:21+02:00", "utc": "1981-12-08T19:46:21Z", "ms": 376688781145.28674 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-08T00:51:09+02:00", "utc": "1981-12-07T22:51:09Z", "ms": 376613469314.172 }, "end": { "local": "1981-12-08T21:46:21+02:00", "utc": "1981-12-08T19:46:21Z", "ms": 376688781145.28674 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-12-07", "window": { "start": { "local": "1981-12-07T11:22:24+02:00", "utc": "1981-12-07T09:22:24Z", "ms": 376564943788.2501 }, "end": { "local": "1981-12-07T12:10:24+02:00", "utc": "1981-12-07T10:10:24Z", "ms": 376567823788.2501 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-12-08", "window": { "start": { "local": "1981-12-08T11:22:50+02:00", "utc": "1981-12-08T09:22:50Z", "ms": 376651370114.31714 }, "end": { "local": "1981-12-08T12:10:50+02:00", "utc": "1981-12-08T10:10:50Z", "ms": 376654250114.31714 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 00:51 on Tue 8 Dec to 21:46 on Tue 8 Dec.", "fact": "1981-12-07T22:51:09Z → 1981-12-08T19:46:21Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 7th, 11:23–12:11 on the 8th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 7th and 48 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 34531 s" }, { "step": "ruling", "text": "Akhaṇḍa Dvādaśī, Cairo, 1981: Tuesday 8 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "akhanda-dvadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 12 Matsya dvadasi, Akhanda dvadasi (paraviddha), Vyanjana dvadasi & Dana dvadasi (Orissa)." } ], "kaala": "madhyahna", "priority": "paraviddha", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-08", "confidence": "determinate" } ], "quote": "In Cairo, Akhaṇḍa Dvādaśī 1981 falls on Tuesday 8 December. Dvādaśī runs from 00:51 on Tue 8 Dec to 21:46 on Tue 8 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/akhanda-dvadashi", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-12-09", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1733, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-12-08T21:46:21+02:00", "utc": "1981-12-08T19:46:21Z", "ms": 376688781145.28674 }, "end": { "local": "1981-12-09T18:16:09+02:00", "utc": "1981-12-09T16:16:09Z", "ms": 376762568628.0858 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-08T21:46:21+02:00", "utc": "1981-12-08T19:46:21Z", "ms": 376688781145.28674 }, "end": { "local": "1981-12-09T18:16:09+02:00", "utc": "1981-12-09T16:16:09Z", "ms": 376762568628.0858 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-12-08", "window": { "start": { "local": "1981-12-08T16:54:50+02:00", "utc": "1981-12-08T14:54:50Z", "ms": 376671289700.6453 }, "end": { "local": "1981-12-08T18:44:48+02:00", "utc": "1981-12-08T16:44:48Z", "ms": 376677887595.6558 } }, "covered_min": 0, "window_min": 110, "qualifies": false }, { "local_date": "1981-12-09", "window": { "start": { "local": "1981-12-09T16:55:00+02:00", "utc": "1981-12-09T14:55:00Z", "ms": 376757699879.74475 }, "end": { "local": "1981-12-09T18:45:02+02:00", "utc": "1981-12-09T16:45:02Z", "ms": 376764302097.8347 } }, "covered_min": 81, "window_min": 110, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 21:46 on Tue 8 Dec to 18:16 on Wed 9 Dec.", "fact": "1981-12-08T19:46:21Z → 1981-12-09T16:16:09Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 16:55–18:45 on the 8th, 16:55–18:45 on the 9th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 110 minutes on the 8th and 81 of 110 on the 9th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 1733 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Cairo, 1981: Wednesday 9 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-09", "confidence": "determinate" } ], "quote": "In Cairo, Śukla Pradoṣa Vrata 1981 falls on Wednesday 9 December. Trayodaśī runs from 21:46 on Tue 8 Dec to 18:16 on Wed 9 Dec and covers 81 of 110 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-12-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/dattatreyotpatti", "festival": "dattatreyotpatti", "name": "Dattātreyotpatti", "everyday": "Datta Jayanti", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8660, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "1981-12-10T14:30:52+02:00", "utc": "1981-12-10T12:30:52Z", "ms": 376835451752.3243 }, "end": { "local": "1981-12-11T10:41:21+02:00", "utc": "1981-12-11T08:41:21Z", "ms": 376908081367.31335 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-10T14:30:52+02:00", "utc": "1981-12-10T12:30:52Z", "ms": 376835451752.3243 }, "end": { "local": "1981-12-11T10:41:21+02:00", "utc": "1981-12-11T08:41:21Z", "ms": 376908081367.31335 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-12-10", "window": { "start": { "local": "1981-12-10T16:55:12+02:00", "utc": "1981-12-10T14:55:12Z", "ms": 376844111705.51526 }, "end": { "local": "1981-12-10T18:45:18+02:00", "utc": "1981-12-10T16:45:18Z", "ms": 376850717917.7665 } }, "covered_min": 110, "window_min": 110, "qualifies": true }, { "local_date": "1981-12-11", "window": { "start": { "local": "1981-12-11T16:55:25+02:00", "utc": "1981-12-11T14:55:25Z", "ms": 376930525166.9113 }, "end": { "local": "1981-12-11T18:45:35+02:00", "utc": "1981-12-11T16:45:35Z", "ms": 376937135041.0078 } }, "covered_min": 0, "window_min": 110, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 14:31 on Thu 10 Dec to 10:41 on Fri 11 Dec.", "fact": "1981-12-10T12:30:52Z → 1981-12-11T08:41:21Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 16:55–18:45 on the 10th, 16:55–18:46 on the 11th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during pradoṣa. It covers 110 of 110 minutes on the 10th and 0 of 110 on the 11th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 8660 s" }, { "step": "ruling", "text": "Dattātreyotpatti, Cairo, 1981: Thursday 10 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "dattatreyotpatti", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 104", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "S 15 Dattatreyotpatti (pradosa)." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-10", "confidence": "determinate" } ], "quote": "In Cairo, Dattātreyotpatti (Datta Jayanti) 1981 falls on Thursday 10 December. Pūrṇimā runs from 14:31 on Thu 10 Dec to 10:41 on Fri 11 Dec and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/dattatreyotpatti", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/sankashta-chaturthi?on=1981-12-14", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6237, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-12-14T00:34:30+02:00", "utc": "1981-12-13T22:34:30Z", "ms": 377130869568.7105 }, "end": { "local": "1981-12-14T22:11:41+02:00", "utc": "1981-12-14T20:11:41Z", "ms": 377208701159.98047 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-14T00:34:30+02:00", "utc": "1981-12-13T22:34:30Z", "ms": 377130869568.7105 }, "end": { "local": "1981-12-14T22:11:41+02:00", "utc": "1981-12-14T20:11:41Z", "ms": 377208701159.98047 } }, "kaala": "moonrise", "days": [ { "local_date": "1981-12-13", "window": { "start": { "local": "1981-12-13T19:22:30+02:00", "utc": "1981-12-13T17:22:30Z", "ms": 377112149628.9296 }, "end": { "local": "1981-12-13T19:22:30+02:00", "utc": "1981-12-13T17:22:30Z", "ms": 377112149628.9296 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "1981-12-14", "window": { "start": { "local": "1981-12-14T20:27:44+02:00", "utc": "1981-12-14T18:27:44Z", "ms": 377202464130.32666 }, "end": { "local": "1981-12-14T20:27:44+02:00", "utc": "1981-12-14T18:27:44Z", "ms": 377202464130.32666 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 00:34 on Mon 14 Dec to 22:12 on Mon 14 Dec.", "fact": "1981-12-13T22:34:30Z → 1981-12-14T20:11:41Z" }, { "step": "kaala", "text": "Moonrise is at 19:22 on the 13th and 20:28 on the 14th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 13th and is on the 14th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one moonrise qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 6237 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Cairo, 1981: Monday 14 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "sankashta-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "not_evaluated": "It is called Aṅgāraka Caturthī when it falls on a Tuesday; the weekday is not tested.", "kaala": "moonrise", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-14", "confidence": "determinate" } ], "quote": "In Cairo, Saṅkaṣṭa Caturthī 1981 falls on Monday 14 December. Caturthī runs from 00:34 on Mon 14 Dec to 22:12 on Mon 14 Dec and is current at moonrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/sankashta-chaturthi?on=1981-12-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/ekadashi?on=1981-12-21", "festival": "ekadashi", "name": "Saphalā Ekādaśī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17905, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "1981-12-20T23:30:01+02:00", "utc": "1981-12-20T21:30:01Z", "ms": 377731800511.7494 }, "end": { "local": "1981-12-22T01:49:08+02:00", "utc": "1981-12-21T23:49:08Z", "ms": 377826548194.08484 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-20T23:30:01+02:00", "utc": "1981-12-20T21:30:01Z", "ms": 377731800511.7494 }, "end": { "local": "1981-12-22T01:49:08+02:00", "utc": "1981-12-21T23:49:08Z", "ms": 377826548194.08484 } }, "kaala": "sunrise", "days": [ { "local_date": "1981-12-21", "window": { "start": { "local": "1981-12-21T06:47:03+02:00", "utc": "1981-12-21T04:47:03Z", "ms": 377758022758.5867 }, "end": { "local": "1981-12-21T06:47:03+02:00", "utc": "1981-12-21T04:47:03Z", "ms": 377758022758.5867 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "1981-12-22", "window": { "start": { "local": "1981-12-22T06:47:33+02:00", "utc": "1981-12-22T04:47:33Z", "ms": 377844453016.17554 }, "end": { "local": "1981-12-22T06:47:33+02:00", "utc": "1981-12-22T04:47:33Z", "ms": 377844453016.17554 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 23:30 on Sun 20 Dec to 01:49 on Tue 22 Dec.", "fact": "1981-12-20T21:30:01Z → 1981-12-21T23:49:08Z" }, { "step": "kaala", "text": "Sunrise is at 06:47 on the 21st and 06:48 on the 22nd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 21st and is not on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 17905 s" }, { "step": "ruling", "text": "Saphalā Ekādaśī, Cairo, 1981: Monday 21 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "ekadashi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 105", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The general rule prevalent in most part of India is that it is to be observed on the day when the tithi is current at sunrise. If it occurs on two successive days, it is to be observed on the second day. When does not occur on any day, it is to be observed on the day of the tithi, but widows and sannyasins would observe on the next-day." } ], "not_evaluated": "The next-day observance for widows and sannyāsins, the Bengal avoidance of an ekādaśī joined to daśamī, and the Vaiṣṇava aruṇodaya rule belong to other traditions and are not applied.", "kaala": "sunrise", "priority": "paraviddha", "when_absent": "tithi-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-21", "confidence": "determinate" } ], "quote": "In Cairo, Saphalā Ekādaśī 1981 falls on Monday 21 December. Ekādaśī runs from 23:30 on Sun 20 Dec to 01:49 on Tue 22 Dec and is current at sunrise that day.", "cite": "https://ahargana.org/cairo/festivals/1981/ekadashi?on=1981-12-21", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/pradosha-vrata?on=1981-12-23", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34367, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "1981-12-23T04:22:51+02:00", "utc": "1981-12-23T02:22:51Z", "ms": 377922170579.766 }, "end": { "local": "1981-12-24T07:02:21+02:00", "utc": "1981-12-24T05:02:21Z", "ms": 378018141305.16614 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-23T04:22:51+02:00", "utc": "1981-12-23T02:22:51Z", "ms": 377922170579.766 }, "end": { "local": "1981-12-24T07:02:21+02:00", "utc": "1981-12-24T05:02:21Z", "ms": 378018141305.16614 } }, "kaala": "pradosha", "days": [ { "local_date": "1981-12-22", "window": { "start": { "local": "1981-12-22T16:59:36+02:00", "utc": "1981-12-22T14:59:36Z", "ms": 377881176210.1647 }, "end": { "local": "1981-12-22T18:50:04+02:00", "utc": "1981-12-22T16:50:04Z", "ms": 377887803648.0317 } }, "covered_min": 0, "window_min": 110, "qualifies": false }, { "local_date": "1981-12-23", "window": { "start": { "local": "1981-12-23T17:00:08+02:00", "utc": "1981-12-23T15:00:08Z", "ms": 377967607725.5423 }, "end": { "local": "1981-12-23T18:50:35+02:00", "utc": "1981-12-23T16:50:35Z", "ms": 377974234649.5775 } }, "covered_min": 110, "window_min": 110, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 04:23 on Wed 23 Dec to 07:02 on Thu 24 Dec.", "fact": "1981-12-23T02:22:51Z → 1981-12-24T05:02:21Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:00–18:50 on the 22nd, 17:00–18:51 on the 23rd.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 0 of 110 minutes on the 22nd and 110 of 110 on the 23rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one evening qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 34367 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Cairo, 1981: Wednesday 23 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "pradosha-vrata", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "Pradosa-vrata — The sukla and krsna trayodasi tithis of each month when cover the period of 'pradosa', are observed as Pradosa-vratas." } ], "kaala": "pradosha", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-23", "confidence": "determinate" } ], "quote": "In Cairo, Kṛṣṇa Pradoṣa Vrata 1981 falls on Wednesday 23 December. Trayodaśī runs from 04:23 on Wed 23 Dec to 07:02 on Thu 24 Dec and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/cairo/festivals/1981/pradosha-vrata?on=1981-12-23", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/shivaratri?on=1981-12-24", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24243, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "1981-12-24T07:02:21+02:00", "utc": "1981-12-24T05:02:21Z", "ms": 378018141305.16614 }, "end": { "local": "1981-12-25T09:40:09+02:00", "utc": "1981-12-25T07:40:09Z", "ms": 378114009106.9263 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-24T07:02:21+02:00", "utc": "1981-12-24T05:02:21Z", "ms": 378018141305.16614 }, "end": { "local": "1981-12-25T09:40:09+02:00", "utc": "1981-12-25T07:40:09Z", "ms": 378114009106.9263 } }, "kaala": "nishita", "days": [ { "local_date": "1981-12-23", "window": { "start": { "local": "1981-12-23T23:30:19+02:00", "utc": "1981-12-23T21:30:19Z", "ms": 377991018690.6743 }, "end": { "local": "1981-12-24T00:18:19+02:00", "utc": "1981-12-23T22:18:19Z", "ms": 377993898690.6743 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-12-24", "window": { "start": { "local": "1981-12-24T23:30:48+02:00", "utc": "1981-12-24T21:30:48Z", "ms": 378077448255.13464 }, "end": { "local": "1981-12-25T00:18:48+02:00", "utc": "1981-12-24T22:18:48Z", "ms": 378080328255.13464 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 07:02 on Thu 24 Dec to 09:40 on Fri 25 Dec.", "fact": "1981-12-24T05:02:21Z → 1981-12-25T07:40:09Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:30–00:18 on the 23rd, 23:31–00:19 on the 24th.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 23rd and 48 of 48 on the 24th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 24243 s" }, { "step": "ruling", "text": "Śivarātri, Cairo, 1981: Thursday 24 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "shivaratri", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion)." } ], "not_evaluated": "The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.", "kaala": "nishita", "priority": "unstated", "when_absent": "unstated" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-24", "confidence": "determinate" } ], "quote": "In Cairo, Śivarātri 1981 falls on Thursday 24 December. Caturdaśī runs from 07:02 on Thu 24 Dec to 09:40 on Fri 25 Dec and covers all of niśītha that night.", "cite": "https://ahargana.org/cairo/festivals/1981/shivaratri?on=1981-12-24", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/cairo/festivals/1981/vinayaka-chaturthi?on=1981-12-30", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360630", "year": 1981, "local_date": "1981-12-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20427, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "1981-12-29T18:01:32+02:00", "utc": "1981-12-29T16:01:32Z", "ms": 378489691859.1289 }, "end": { "local": "1981-12-30T19:10:39+02:00", "utc": "1981-12-30T17:10:39Z", "ms": 378580238986.50134 }, "month": { "amanta": 9, "purnimanta": 9, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "1981-12-29T18:01:32+02:00", "utc": "1981-12-29T16:01:32Z", "ms": 378489691859.1289 }, "end": { "local": "1981-12-30T19:10:39+02:00", "utc": "1981-12-30T17:10:39Z", "ms": 378580238986.50134 } }, "kaala": "madhyahna", "days": [ { "local_date": "1981-12-29", "window": { "start": { "local": "1981-12-29T11:33:05+02:00", "utc": "1981-12-29T09:33:05Z", "ms": 378466384886.8563 }, "end": { "local": "1981-12-29T12:21:05+02:00", "utc": "1981-12-29T10:21:05Z", "ms": 378469264886.8563 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "1981-12-30", "window": { "start": { "local": "1981-12-30T11:33:34+02:00", "utc": "1981-12-30T09:33:34Z", "ms": 378552814297.3075 }, "end": { "local": "1981-12-30T12:21:34+02:00", "utc": "1981-12-30T10:21:34Z", "ms": 378555694297.3075 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 18:02 on Tue 29 Dec to 19:11 on Wed 30 Dec.", "fact": "1981-12-29T16:01:32Z → 1981-12-30T17:10:39Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:33–12:21 on the 29th, 11:34–12:22 on the 30th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 29th and 48 of 48 on the 30th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 20427 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Cairo, 1981: Wednesday 30 December.", "fact": "confidence: determinate" } ], "rule": { "kind": "lunar", "id": "vinayaka-chaturthi", "references": [ { "text": "Calendar Reform Committee 1955, General Rules for Religious Festivals", "locator": "p. 108", "url": "https://archive.org/details/calendar_reform_comittee_report", "quote": "The sukla caturthi in each month is called Ganesa caturthi or Vinayaka caturthi. It is observed at madhyahna. The chief among them are caturthis of Bhadrapada and Magha. Similarly the krsna caturthi in each month is called Sankasta caturthi, to be observed on the day when the tithi is current at moonrise. It is called Angaraka caturthi if it falls on Tuesday." } ], "kaala": "madhyahna", "priority": "unstated", "when_absent": "second-day" }, "alternatives": [ { "kind": "profile", "profile": "classical@2026.1", "local_date": "1981-12-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "1981-12-30", "confidence": "determinate" } ], "quote": "In Cairo, Vināyaka Caturthī 1981 falls on Wednesday 30 December. Caturthī runs from 18:02 on Tue 29 Dec to 19:11 on Wed 30 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/cairo/festivals/1981/vinayaka-chaturthi?on=1981-12-30", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } } ], "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }