{ "id": "/giza/festivals/2037", "place": { "id": "360995", "slug": "giza", "name": "Giza", "region": "Egypt", "country": "EG", "lat": 30.00944, "lon": 31.20861, "elevation_m": 19, "tz": "Africa/Cairo" }, "year": 2037, "tradition": "smarta", "method": "pac-rp@2026.1", "ruleset": "2026.3-draft", "rulings": [ { "id": "/giza/festivals/2037/sankashta-chaturthi?on=2037-01-04", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2462, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-01-04T19:16:18+02:00", "utc": "2037-01-04T17:16:18Z", "ms": 2114702178028.9995 }, "end": { "local": "2037-01-05T16:17:08+02:00", "utc": "2037-01-05T14:17:08Z", "ms": 2114777827619.5398 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-04T19:16:18+02:00", "utc": "2037-01-04T17:16:18Z", "ms": 2114702178028.9995 }, "end": { "local": "2037-01-05T16:17:08+02:00", "utc": "2037-01-05T14:17:08Z", "ms": 2114777827619.5398 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-01-04", "window": { "start": { "local": "2037-01-04T19:57:20+02:00", "utc": "2037-01-04T17:57:20Z", "ms": 2114704639667.2017 }, "end": { "local": "2037-01-04T19:57:20+02:00", "utc": "2037-01-04T17:57:20Z", "ms": 2114704639667.2017 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-01-05", "window": { "start": { "local": "2037-01-05T21:04:33+02:00", "utc": "2037-01-05T19:04:33Z", "ms": 2114795072585.1096 }, "end": { "local": "2037-01-05T21:04:33+02:00", "utc": "2037-01-05T19:04:33Z", "ms": 2114795072585.1096 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 19:16 on Sun 4 Jan to 16:17 on Mon 5 Jan.", "fact": "2037-01-04T17:16:18Z → 2037-01-05T14:17:08Z" }, { "step": "kaala", "text": "Moonrise is at 19:57 on the 4th and 21:05 on the 5th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 4th and is not on the 5th.", "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 2462 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Sunday 4 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": "2037-01-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-04", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Sunday 4 January. Caturthī runs from 19:16 on Sun 4 Jan to 16:17 on Mon 5 Jan and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-01-04", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-01-11", "festival": "ekadashi", "name": "Ṣaṭtilā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1179, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-01-11T06:27:34+02:00", "utc": "2037-01-11T04:27:34Z", "ms": 2115260853939.21 }, "end": { "local": "2037-01-12T06:32:41+02:00", "utc": "2037-01-12T04:32:41Z", "ms": 2115347560764.9656 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-11T06:27:34+02:00", "utc": "2037-01-11T04:27:34Z", "ms": 2115260853939.21 }, "end": { "local": "2037-01-12T06:32:41+02:00", "utc": "2037-01-12T04:32:41Z", "ms": 2115347560764.9656 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-01-11", "window": { "start": { "local": "2037-01-11T06:52:23+02:00", "utc": "2037-01-11T04:52:23Z", "ms": 2115262342598.307 }, "end": { "local": "2037-01-11T06:52:23+02:00", "utc": "2037-01-11T04:52:23Z", "ms": 2115262342598.307 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-01-12", "window": { "start": { "local": "2037-01-12T06:52:20+02:00", "utc": "2037-01-12T04:52:20Z", "ms": 2115348739536.1213 }, "end": { "local": "2037-01-12T06:52:20+02:00", "utc": "2037-01-12T04:52:20Z", "ms": 2115348739536.1213 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 06:28 on Sun 11 Jan to 06:33 on Mon 12 Jan.", "fact": "2037-01-11T04:27:34Z → 2037-01-12T04:32:41Z" }, { "step": "kaala", "text": "Sunrise is at 06:52 on the 11th and 06:52 on the 12th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 11th and is not on the 12th.", "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 1179 s" }, { "step": "ruling", "text": "Ṣaṭtilā Ekādaśī, Giza, 2037: Sunday 11 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": "2037-01-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-11", "confidence": "determinate" } ], "quote": "In Giza, Ṣaṭtilā Ekādaśī 2037 falls on Sunday 11 January. Ekādaśī runs from 06:28 on Sun 11 Jan to 06:33 on Mon 12 Jan and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-01-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/bhogi", "festival": "bhogi", "name": "Bhogi", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36026, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-02-12T20:17:25+02:00", "utc": "2037-02-12T18:17:25Z", "ms": 2118075444892.0356 } }, "span": { "of": "transit", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 } }, "kaala": "sunset-day", "days": [ { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-13T17:15:48+02:00", "utc": "2037-01-13T15:15:48Z", "ms": 2115472548266.438 }, "end": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 } }, "covered_min": 1, "window_min": 1441, "qualifies": true }, { "local_date": "2037-01-15", "window": { "start": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 }, "end": { "local": "2037-01-15T17:17:30+02:00", "utc": "2037-01-15T15:17:30Z", "ms": 2115645449981.8936 } }, "covered_min": 0, "window_min": 1441, "qualifies": false } ], "follows": { "festival": "pongal", "name": "Pongal", "local_date": "2037-01-14", "days": -1 }, "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 07:16 on Wed 14 Jan.", "fact": "2037-01-14T05:16:13Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from the sunset before it to its own sunset: the day of the 14th ends at 17:17, and the day of the 15th ends at 17:17.", "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 36026 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, Giza, 2037: 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": "2037-01-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-13", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "2037-01-13", "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": "2037-01-13", "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 Giza, Bhogi 2037 falls on Tuesday 13 January. It is kept the day before Pongal, which falls on Wednesday 14 January. The Sun enters Makara at 07:16 on Wed 14 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-01-13", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32769, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-01-13T07:07:26+02:00", "utc": "2037-01-13T05:07:26Z", "ms": 2115436045606.5217 }, "end": { "local": "2037-01-14T08:10:30+02:00", "utc": "2037-01-14T06:10:30Z", "ms": 2115526229659.1934 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-13T07:07:26+02:00", "utc": "2037-01-13T05:07:26Z", "ms": 2115436045606.5217 }, "end": { "local": "2037-01-14T08:10:30+02:00", "utc": "2037-01-14T06:10:30Z", "ms": 2115526229659.1934 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-01-13", "window": { "start": { "local": "2037-01-13T17:15:48+02:00", "utc": "2037-01-13T15:15:48Z", "ms": 2115472548266.438 }, "end": { "local": "2037-01-13T19:04:39+02:00", "utc": "2037-01-13T17:04:39Z", "ms": 2115479078954.331 } }, "covered_min": 109, "window_min": 109, "qualifies": true }, { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 }, "end": { "local": "2037-01-14T19:05:22+02:00", "utc": "2037-01-14T17:05:22Z", "ms": 2115565521805.3662 } }, "covered_min": 0, "window_min": 109, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 07:07 on Tue 13 Jan to 08:10 on Wed 14 Jan.", "fact": "2037-01-13T05:07:26Z → 2037-01-14T06:10:30Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:16–19:05 on the 13th, 17:17–19:05 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 109 of 109 minutes on the 13th and 0 of 109 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 32769 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Tuesday 13 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": "2037-01-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-13", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Tuesday 13 January. Trayodaśī runs from 07:07 on Tue 13 Jan to 08:10 on Wed 14 Jan and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-01-13", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pongal", "festival": "pongal", "name": "Pongal", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36026, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-02-12T20:17:25+02:00", "utc": "2037-02-12T18:17:25Z", "ms": 2118075444892.0356 } }, "span": { "of": "transit", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 } }, "kaala": "sunset-day", "days": [ { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-13T17:15:48+02:00", "utc": "2037-01-13T15:15:48Z", "ms": 2115472548266.438 }, "end": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 } }, "covered_min": 1, "window_min": 1441, "qualifies": true }, { "local_date": "2037-01-15", "window": { "start": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 }, "end": { "local": "2037-01-15T17:17:30+02:00", "utc": "2037-01-15T15:17:30Z", "ms": 2115645449981.8936 } }, "covered_min": 0, "window_min": 1441, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 07:16 on Wed 14 Jan.", "fact": "2037-01-14T05:16:13Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from the sunset before it to its own sunset: the day of the 14th ends at 17:17, and the day of the 15th ends at 17:17.", "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 36026 s" }, { "step": "ruling", "text": "Pongal, Giza, 2037: 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": "2037-01-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-14", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "2037-01-14", "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": "2037-01-14", "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 Giza, Pongal 2037 falls on Wednesday 14 January. The Sun enters Makara at 07:16 on Wed 14 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/makara-sankranti", "festival": "makara-sankranti", "name": "Makara Saṅkrānti", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 26173, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-02-12T20:17:25+02:00", "utc": "2037-02-12T18:17:25Z", "ms": 2118075444892.0356 } }, "span": { "of": "transit", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 } }, "kaala": "civil-day", "days": [ { "local_date": "2037-01-13", "window": { "start": { "local": "2037-01-13T00:00:00+02:00", "utc": "2037-01-12T22:00:00Z", "ms": 2115410400000 }, "end": { "local": "2037-01-14T00:00:00+02:00", "utc": "2037-01-13T22:00:00Z", "ms": 2115496800000 } }, "covered_min": 0, "window_min": 1440, "qualifies": false }, { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-14T00:00:00+02:00", "utc": "2037-01-13T22:00:00Z", "ms": 2115496800000 }, "end": { "local": "2037-01-15T00:00:00+02:00", "utc": "2037-01-14T22:00:00Z", "ms": 2115583200000 } }, "covered_min": 1, "window_min": 1440, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 07:16 on Wed 14 Jan.", "fact": "2037-01-14T05:16:13Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from midnight to midnight, on the clock of Giza.", "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 14th, not the 13th.", "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 26173 s" }, { "step": "ruling", "text": "Makara Saṅkrānti, Giza, 2037: Wednesday 14 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": "2037-01-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-14", "confidence": "determinate" }, { "kind": "reckoning", "id": "sunrise-day", "local_date": "2037-01-14", "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." } }, { "kind": "reckoning", "id": "sunset-rule", "local_date": "2037-01-14", "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 Giza, Makara Saṅkrānti 2037 falls on Wednesday 14 January. The Sun enters Makara at 07:16 on Wed 14 Jan, and the rule counts the day from midnight.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/shivaratri?on=2037-01-14", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 27751, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-01-14T08:10:30+02:00", "utc": "2037-01-14T06:10:30Z", "ms": 2115526229659.1934 }, "end": { "local": "2037-01-15T09:40:14+02:00", "utc": "2037-01-15T07:40:14Z", "ms": 2115618013859.9358 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-14T08:10:30+02:00", "utc": "2037-01-14T06:10:30Z", "ms": 2115526229659.1934 }, "end": { "local": "2037-01-15T09:40:14+02:00", "utc": "2037-01-15T07:40:14Z", "ms": 2115618013859.9358 } }, "kaala": "nishita", "days": [ { "local_date": "2037-01-13", "window": { "start": { "local": "2037-01-13T23:39:58+02:00", "utc": "2037-01-13T21:39:58Z", "ms": 2115495598346.0374 }, "end": { "local": "2037-01-14T00:27:58+02:00", "utc": "2037-01-13T22:27:58Z", "ms": 2115498478346.0374 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-14T23:40:20+02:00", "utc": "2037-01-14T21:40:20Z", "ms": 2115582019660.9612 }, "end": { "local": "2037-01-15T00:28:20+02:00", "utc": "2037-01-14T22:28:20Z", "ms": 2115584899660.9612 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 08:10 on Wed 14 Jan to 09:40 on Thu 15 Jan.", "fact": "2037-01-14T06:10:30Z → 2037-01-15T07:40:14Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:40–00:28 on the 13th, 23:40–00:28 on the 14th.", "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 13th and 48 of 48 on the 14th.", "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 27751 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Wednesday 14 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": "2037-01-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-14", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Wednesday 14 January. Caturdaśī runs from 08:10 on Wed 14 Jan to 09:40 on Thu 15 Jan and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-01-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/mattu-pongal", "festival": "mattu-pongal", "name": "Mattu Pongal", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36026, "anga": { "type": "sankranti", "index": 9, "key": "makara", "name": "Makara", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-02-12T20:17:25+02:00", "utc": "2037-02-12T18:17:25Z", "ms": 2118075444892.0356 } }, "span": { "of": "transit", "start": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 }, "end": { "local": "2037-01-14T07:16:13+02:00", "utc": "2037-01-14T05:16:13Z", "ms": 2115522972848.6733 } }, "kaala": "sunset-day", "days": [ { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-13T17:15:48+02:00", "utc": "2037-01-13T15:15:48Z", "ms": 2115472548266.438 }, "end": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 } }, "covered_min": 1, "window_min": 1441, "qualifies": true }, { "local_date": "2037-01-15", "window": { "start": { "local": "2037-01-14T17:16:39+02:00", "utc": "2037-01-14T15:16:39Z", "ms": 2115558998948.7861 }, "end": { "local": "2037-01-15T17:17:30+02:00", "utc": "2037-01-15T15:17:30Z", "ms": 2115645449981.8936 } }, "covered_min": 0, "window_min": 1441, "qualifies": false } ], "follows": { "festival": "pongal", "name": "Pongal", "local_date": "2037-01-14", "days": 1 }, "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Makara at 07:16 on Wed 14 Jan.", "fact": "2037-01-14T05:16:13Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day is counted from the sunset before it to its own sunset: the day of the 14th ends at 17:17, and the day of the 15th ends at 17:17.", "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 36026 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, Giza, 2037: 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": "2037-01-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-15", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "2037-01-15", "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": "2037-01-15", "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 Giza, Mattu Pongal 2037 falls on Thursday 15 January. It is kept the day after Pongal, which falls on Wednesday 14 January. The Sun enters Makara at 07:16 on Wed 14 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/yama-tarpana", "festival": "yama-tarpana", "name": "Yama Tarpaṇa", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4701, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-01-14T08:10:30+02:00", "utc": "2037-01-14T06:10:30Z", "ms": 2115526229659.1934 }, "end": { "local": "2037-01-15T09:40:14+02:00", "utc": "2037-01-15T07:40:14Z", "ms": 2115618013859.9358 }, "month": { "amanta": 9, "purnimanta": 10, "adhika": false, "amanta_name": "Pauṣa", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-14T08:10:30+02:00", "utc": "2037-01-14T06:10:30Z", "ms": 2115526229659.1934 }, "end": { "local": "2037-01-15T09:40:14+02:00", "utc": "2037-01-15T07:40:14Z", "ms": 2115618013859.9358 } }, "kaala": "arunodaya", "days": [ { "local_date": "2037-01-14", "window": { "start": { "local": "2037-01-14T05:03:18+02:00", "utc": "2037-01-14T03:03:18Z", "ms": 2115514997737.7437 }, "end": { "local": "2037-01-14T06:52:08+02:00", "utc": "2037-01-14T04:52:08Z", "ms": 2115521528425.6367 } }, "covered_min": 0, "window_min": 109, "qualifies": false }, { "local_date": "2037-01-15", "window": { "start": { "local": "2037-01-15T05:03:18+02:00", "utc": "2037-01-15T03:03:18Z", "ms": 2115601397516.5562 }, "end": { "local": "2037-01-15T06:52:00+02:00", "utc": "2037-01-15T04:52:00Z", "ms": 2115607920373.1362 } }, "covered_min": 109, "window_min": 109, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 08:10 on Wed 14 Jan to 09:40 on Thu 15 Jan.", "fact": "2037-01-14T06:10:30Z → 2037-01-15T07:40:14Z" }, { "step": "kaala", "text": "Aruṇodaya is 2 muhūrtas before sunrise: 05:03–06:52 on the 14th, 05:03–06:52 on the 15th.", "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 0 of 109 minutes on the 14th and 109 of 109 on the 15th.", "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 4701 s" }, { "step": "ruling", "text": "Yama Tarpaṇa, Giza, 2037: Thursday 15 January.", "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": "2037-01-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-15", "confidence": "determinate" } ], "quote": "In Giza, Yama Tarpaṇa 2037 falls on Thursday 15 January. Caturdaśī runs from 08:10 on Wed 14 Jan to 09:40 on Thu 15 Jan and covers all of aruṇodaya that dawn.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ganesha-jayanti", "festival": "ganesha-jayanti", "name": "Gaṇeśa Jayantī", "everyday": "Maghi Ganesh Jayanti", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23679, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-01-19T19:04:43+02:00", "utc": "2037-01-19T17:04:43Z", "ms": 2115997483248.349 }, "end": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-19T19:04:43+02:00", "utc": "2037-01-19T17:04:43Z", "ms": 2115997483248.349 }, "end": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-01-19", "window": { "start": { "local": "2037-01-19T11:42:04+02:00", "utc": "2037-01-19T09:42:04Z", "ms": 2115970924140.6997 }, "end": { "local": "2037-01-19T12:30:04+02:00", "utc": "2037-01-19T10:30:04Z", "ms": 2115973804140.6997 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-01-20", "window": { "start": { "local": "2037-01-20T11:42:22+02:00", "utc": "2037-01-20T09:42:22Z", "ms": 2116057342037.316 }, "end": { "local": "2037-01-20T12:30:22+02:00", "utc": "2037-01-20T10:30:22Z", "ms": 2116060222037.316 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 19:05 on Mon 19 Jan to 21:49 on Tue 20 Jan.", "fact": "2037-01-19T17:04:43Z → 2037-01-20T19:48:33Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:42–12:30 on the 19th, 11:42–12:30 on the 20th.", "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 19th and 48 of 48 on the 20th.", "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 23679 s" }, { "step": "ruling", "text": "Gaṇeśa Jayantī, Giza, 2037: Tuesday 20 January.", "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": "2037-01-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-20", "confidence": "determinate" } ], "quote": "In Giza, Gaṇeśa Jayantī (Maghi Ganesh Jayanti) 2037 falls on Tuesday 20 January. Caturthī runs from 19:05 on Mon 19 Jan to 21:49 on Tue 20 Jan and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/tila-chaturthi", "festival": "tila-chaturthi", "name": "Tila Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-20", "confidence": "boundary", "boundary_reasons": [ "margin", "tie-break-unstated" ], "boundary_margin_s": 253, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-01-19T19:04:43+02:00", "utc": "2037-01-19T17:04:43Z", "ms": 2115997483248.349 }, "end": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-19T19:04:43+02:00", "utc": "2037-01-19T17:04:43Z", "ms": 2115997483248.349 }, "end": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-01-19", "window": { "start": { "local": "2037-01-19T17:20:57+02:00", "utc": "2037-01-19T15:20:57Z", "ms": 2115991256753.3552 }, "end": { "local": "2037-01-19T19:08:57+02:00", "utc": "2037-01-19T17:08:57Z", "ms": 2115997736543.033 } }, "covered_min": 4, "window_min": 108, "qualifies": true }, { "local_date": "2037-01-20", "window": { "start": { "local": "2037-01-20T17:21:49+02:00", "utc": "2037-01-20T15:21:49Z", "ms": 2116077708898.6938 }, "end": { "local": "2037-01-20T19:09:39+02:00", "utc": "2037-01-20T17:09:39Z", "ms": 2116084179336.2654 } }, "covered_min": 108, "window_min": 108, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Caturthī runs from 19:05 on Mon 19 Jan to 21:49 on Tue 20 Jan.", "fact": "2037-01-19T17:04:43Z → 2037-01-20T19:48:33Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:21–19:09 on the 19th, 17:22–19:10 on the 20th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during pradoṣa. It covers 4 of 108 minutes on the 19th and 108 of 108 on the 20th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "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 253 s < 300 s" }, { "step": "ruling", "text": "Tila Caturthī, Giza, 2037: Tuesday 20 January.", "fact": "confidence: boundary (margin, tie-break-unstated)" } ], "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": "2037-01-20", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-20", "confidence": "boundary" } ], "quote": "In Giza, Tila Caturthī 2037 falls on Tuesday 20 January. Caturthī runs from 19:05 on Mon 19 Jan to 21:49 on Tue 20 Jan and covers all of pradoṣa that evening. It also reaches the previous evening for 4 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 4 min 13 s from a threshold: treat the date as contested.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/shri-panchami", "festival": "shri-panchami", "name": "Śrī Pañcamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33491, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 }, "end": { "local": "2037-01-22T00:23:10+02:00", "utc": "2037-01-21T22:23:10Z", "ms": 2116189390181.2556 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 }, "end": { "local": "2037-01-22T00:23:10+02:00", "utc": "2037-01-21T22:23:10Z", "ms": 2116189390181.2556 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-01-20", "window": { "start": { "local": "2037-01-20T11:42:22+02:00", "utc": "2037-01-20T09:42:22Z", "ms": 2116057342037.316 }, "end": { "local": "2037-01-20T12:30:22+02:00", "utc": "2037-01-20T10:30:22Z", "ms": 2116060222037.316 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-01-21", "window": { "start": { "local": "2037-01-21T11:42:39+02:00", "utc": "2037-01-21T09:42:39Z", "ms": 2116143759163.5898 }, "end": { "local": "2037-01-21T12:30:39+02:00", "utc": "2037-01-21T10:30:39Z", "ms": 2116146639163.5898 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 21:49 on Tue 20 Jan to 00:23 on Thu 22 Jan.", "fact": "2037-01-20T19:48:33Z → 2037-01-21T22:23:10Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:42–12:30 on the 20th, 11:43–12:31 on the 21st.", "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 20th and 48 of 48 on the 21st.", "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 33491 s" }, { "step": "ruling", "text": "Śrī Pañcamī, Giza, 2037: Wednesday 21 January.", "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": "2037-01-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-21", "confidence": "determinate" } ], "quote": "In Giza, Śrī Pañcamī 2037 falls on Wednesday 21 January. Pañcamī runs from 21:49 on Tue 20 Jan to 00:23 on Thu 22 Jan and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vasanta-panchami", "festival": "vasanta-panchami", "name": "Vasanta Pañcamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33491, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 }, "end": { "local": "2037-01-22T00:23:10+02:00", "utc": "2037-01-21T22:23:10Z", "ms": 2116189390181.2556 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-20T21:48:33+02:00", "utc": "2037-01-20T19:48:33Z", "ms": 2116093712780.6846 }, "end": { "local": "2037-01-22T00:23:10+02:00", "utc": "2037-01-21T22:23:10Z", "ms": 2116189390181.2556 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-01-20", "window": { "start": { "local": "2037-01-20T11:42:22+02:00", "utc": "2037-01-20T09:42:22Z", "ms": 2116057342037.316 }, "end": { "local": "2037-01-20T12:30:22+02:00", "utc": "2037-01-20T10:30:22Z", "ms": 2116060222037.316 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-01-21", "window": { "start": { "local": "2037-01-21T11:42:39+02:00", "utc": "2037-01-21T09:42:39Z", "ms": 2116143759163.5898 }, "end": { "local": "2037-01-21T12:30:39+02:00", "utc": "2037-01-21T10:30:39Z", "ms": 2116146639163.5898 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 21:49 on Tue 20 Jan to 00:23 on Thu 22 Jan.", "fact": "2037-01-20T19:48:33Z → 2037-01-21T22:23:10Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:42–12:30 on the 20th, 11:43–12:31 on the 21st.", "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 20th and 48 of 48 on the 21st.", "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 33491 s" }, { "step": "ruling", "text": "Vasanta Pañcamī, Giza, 2037: Wednesday 21 January.", "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": "2037-01-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-21", "confidence": "determinate" } ], "quote": "In Giza, Vasanta Pañcamī 2037 falls on Wednesday 21 January. Pañcamī runs from 21:49 on Tue 20 Jan to 00:23 on Thu 22 Jan and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ratha-saptami", "festival": "ratha-saptami", "name": "Ratha Saptamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2588, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-01-23T02:37:03+02:00", "utc": "2037-01-23T00:37:03Z", "ms": 2116283822650.7698 }, "end": { "local": "2037-01-24T04:19:04+02:00", "utc": "2037-01-24T02:19:04Z", "ms": 2116376344052.356 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-23T02:37:03+02:00", "utc": "2037-01-23T00:37:03Z", "ms": 2116283822650.7698 }, "end": { "local": "2037-01-24T04:19:04+02:00", "utc": "2037-01-24T02:19:04Z", "ms": 2116376344052.356 } }, "kaala": "arunodaya", "days": [ { "local_date": "2037-01-23", "window": { "start": { "local": "2037-01-23T05:02:25+02:00", "utc": "2037-01-23T03:02:25Z", "ms": 2116292545253.7568 }, "end": { "local": "2037-01-23T06:49:56+02:00", "utc": "2037-01-23T04:49:56Z", "ms": 2116298996298.8386 } }, "covered_min": 108, "window_min": 108, "qualifies": true }, { "local_date": "2037-01-24", "window": { "start": { "local": "2037-01-24T05:02:12+02:00", "utc": "2037-01-24T03:02:12Z", "ms": 2116378932419.0508 }, "end": { "local": "2037-01-24T06:49:33+02:00", "utc": "2037-01-24T04:49:33Z", "ms": 2116385373436.4968 } }, "covered_min": 0, "window_min": 107, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 02:37 on Fri 23 Jan to 04:19 on Sat 24 Jan.", "fact": "2037-01-23T00:37:03Z → 2037-01-24T02:19:04Z" }, { "step": "kaala", "text": "Aruṇodaya is 2 muhūrtas before sunrise: 05:02–06:50 on the 23rd, 05:02–06:50 on the 24th.", "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 108 of 108 minutes on the 23rd and 0 of 107 on the 24th.", "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 2588 s" }, { "step": "ruling", "text": "Ratha Saptamī, Giza, 2037: Friday 23 January.", "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": "2037-01-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-23", "confidence": "determinate" } ], "quote": "In Giza, Ratha Saptamī 2037 falls on Friday 23 January. Saptamī runs from 02:37 on Fri 23 Jan to 04:19 on Sat 24 Jan and covers all of aruṇodaya that dawn.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-01-27", "festival": "ekadashi", "name": "Jayā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6563, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-01-27T04:58:52+02:00", "utc": "2037-01-27T02:58:52Z", "ms": 2116637932291.3105 }, "end": { "local": "2037-01-28T03:35:43+02:00", "utc": "2037-01-28T01:35:43Z", "ms": 2116719342938.8208 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-27T04:58:52+02:00", "utc": "2037-01-27T02:58:52Z", "ms": 2116637932291.3105 }, "end": { "local": "2037-01-28T03:35:43+02:00", "utc": "2037-01-28T01:35:43Z", "ms": 2116719342938.8208 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-01-27", "window": { "start": { "local": "2037-01-27T06:48:15+02:00", "utc": "2037-01-27T04:48:15Z", "ms": 2116644495341.8464 }, "end": { "local": "2037-01-27T06:48:15+02:00", "utc": "2037-01-27T04:48:15Z", "ms": 2116644495341.8464 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-01-28", "window": { "start": { "local": "2037-01-28T06:47:46+02:00", "utc": "2037-01-28T04:47:46Z", "ms": 2116730866201.0012 }, "end": { "local": "2037-01-28T06:47:46+02:00", "utc": "2037-01-28T04:47:46Z", "ms": 2116730866201.0012 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 04:59 on Tue 27 Jan to 03:36 on Wed 28 Jan.", "fact": "2037-01-27T02:58:52Z → 2037-01-28T01:35:43Z" }, { "step": "kaala", "text": "Sunrise is at 06:48 on the 27th and 06:48 on the 28th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 27th and is not 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 6563 s" }, { "step": "ruling", "text": "Jayā Ekādaśī, Giza, 2037: Tuesday 27 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": "2037-01-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-27", "confidence": "determinate" } ], "quote": "In Giza, Jayā Ekādaśī 2037 falls on Tuesday 27 January. Ekādaśī runs from 04:59 on Tue 27 Jan to 03:36 on Wed 28 Jan and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-01-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/bhishma-dvadashi", "festival": "bhishma-dvadashi", "name": "Bhīṣma Dvādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 29314, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-01-28T03:35:43+02:00", "utc": "2037-01-28T01:35:43Z", "ms": 2116719342938.8208 }, "end": { "local": "2037-01-29T01:29:07+02:00", "utc": "2037-01-28T23:29:07Z", "ms": 2116798147126.6387 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-28T03:35:43+02:00", "utc": "2037-01-28T01:35:43Z", "ms": 2116719342938.8208 }, "end": { "local": "2037-01-29T01:29:07+02:00", "utc": "2037-01-28T23:29:07Z", "ms": 2116798147126.6387 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-01-28", "window": { "start": { "local": "2037-01-28T11:44:17+02:00", "utc": "2037-01-28T09:44:17Z", "ms": 2116748656542.3442 }, "end": { "local": "2037-01-28T12:32:17+02:00", "utc": "2037-01-28T10:32:17Z", "ms": 2116751536542.3442 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-01-29", "window": { "start": { "local": "2037-01-29T11:44:27+02:00", "utc": "2037-01-29T09:44:27Z", "ms": 2116835067157.7854 }, "end": { "local": "2037-01-29T12:32:27+02:00", "utc": "2037-01-29T10:32:27Z", "ms": 2116837947157.7854 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 03:36 on Wed 28 Jan to 01:29 on Thu 29 Jan.", "fact": "2037-01-28T01:35:43Z → 2037-01-28T23:29:07Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:44–12:32 on the 28th, 11:44–12:32 on the 29th.", "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 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 29314 s" }, { "step": "ruling", "text": "Bhīṣma Dvādaśī, Giza, 2037: Wednesday 28 January.", "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": "2037-01-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-28", "confidence": "determinate" } ], "quote": "In Giza, Bhīṣma Dvādaśī 2037 falls on Wednesday 28 January. Dvādaśī runs from 03:36 on Wed 28 Jan to 01:29 on Thu 29 Jan and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-01-29", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12598, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-01-29T01:29:07+02:00", "utc": "2037-01-28T23:29:07Z", "ms": 2116798147126.6387 }, "end": { "local": "2037-01-29T22:45:54+02:00", "utc": "2037-01-29T20:45:54Z", "ms": 2116874753699.2207 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-29T01:29:07+02:00", "utc": "2037-01-28T23:29:07Z", "ms": 2116798147126.6387 }, "end": { "local": "2037-01-29T22:45:54+02:00", "utc": "2037-01-29T20:45:54Z", "ms": 2116874753699.2207 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-01-28", "window": { "start": { "local": "2037-01-28T17:28:47+02:00", "utc": "2037-01-28T15:28:47Z", "ms": 2116769326883.6875 }, "end": { "local": "2037-01-28T19:15:15+02:00", "utc": "2037-01-28T17:15:15Z", "ms": 2116775714704.5513 } }, "covered_min": 0, "window_min": 106, "qualifies": false }, { "local_date": "2037-01-29", "window": { "start": { "local": "2037-01-29T17:29:39+02:00", "utc": "2037-01-29T15:29:39Z", "ms": 2116855778775.405 }, "end": { "local": "2037-01-29T19:15:55+02:00", "utc": "2037-01-29T17:15:55Z", "ms": 2116862155389.7358 } }, "covered_min": 106, "window_min": 106, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 01:29 on Thu 29 Jan to 22:46 on Thu 29 Jan.", "fact": "2037-01-28T23:29:07Z → 2037-01-29T20:45:54Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:29–19:15 on the 28th, 17:30–19:16 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 106 minutes on the 28th and 106 of 106 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 12598 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Thursday 29 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": "2037-01-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-29", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Thursday 29 January. Trayodaśī runs from 01:29 on Thu 29 Jan to 22:46 on Thu 29 Jan and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-01-29", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/maghi-purnima", "festival": "maghi-purnima", "name": "Māghī Pūrṇimā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-01-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12686, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-01-30T19:34:28+02:00", "utc": "2037-01-30T17:34:28Z", "ms": 2116949667593.0088 }, "end": { "local": "2037-01-31T16:04:12+02:00", "utc": "2037-01-31T14:04:12Z", "ms": 2117023452268.4482 }, "month": { "amanta": 10, "purnimanta": 10, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Māgha" } }, "span": { "of": "tithi", "start": { "local": "2037-01-30T19:34:28+02:00", "utc": "2037-01-30T17:34:28Z", "ms": 2116949667593.0088 }, "end": { "local": "2037-01-31T16:04:12+02:00", "utc": "2037-01-31T14:04:12Z", "ms": 2117023452268.4482 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-01-30", "window": { "start": { "local": "2037-01-30T11:44:37+02:00", "utc": "2037-01-30T09:44:37Z", "ms": 2116921476943.9111 }, "end": { "local": "2037-01-30T12:32:37+02:00", "utc": "2037-01-30T10:32:37Z", "ms": 2116924356943.9111 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-01-31", "window": { "start": { "local": "2037-01-31T11:44:46+02:00", "utc": "2037-01-31T09:44:46Z", "ms": 2117007885904.166 }, "end": { "local": "2037-01-31T12:32:46+02:00", "utc": "2037-01-31T10:32:46Z", "ms": 2117010765904.166 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 19:34 on Fri 30 Jan to 16:04 on Sat 31 Jan.", "fact": "2037-01-30T17:34:28Z → 2037-01-31T14:04:12Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 30th, 11:45–12:33 on the 31st.", "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 30th and 48 of 48 on the 31st.", "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 12686 s" }, { "step": "ruling", "text": "Māghī Pūrṇimā, Giza, 2037: Saturday 31 January.", "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": "2037-01-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-01-31", "confidence": "determinate" } ], "quote": "In Giza, Māghī Pūrṇimā 2037 falls on Saturday 31 January. Pūrṇimā runs from 19:34 on Fri 30 Jan to 16:04 on Sat 31 Jan and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-02-03", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18785, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-02-03T05:19:39+02:00", "utc": "2037-02-03T03:19:39Z", "ms": 2117243978537.8147 }, "end": { "local": "2037-02-04T02:12:33+02:00", "utc": "2037-02-04T00:12:33Z", "ms": 2117319153123.2856 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-03T05:19:39+02:00", "utc": "2037-02-03T03:19:39Z", "ms": 2117243978537.8147 }, "end": { "local": "2037-02-04T02:12:33+02:00", "utc": "2037-02-04T00:12:33Z", "ms": 2117319153123.2856 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-02-02", "window": { "start": { "local": "2037-02-02T19:52:18+02:00", "utc": "2037-02-02T17:52:18Z", "ms": 2117209937588.512 }, "end": { "local": "2037-02-02T19:52:18+02:00", "utc": "2037-02-02T17:52:18Z", "ms": 2117209937588.512 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-02-03", "window": { "start": { "local": "2037-02-03T20:59:28+02:00", "utc": "2037-02-03T18:59:28Z", "ms": 2117300368346.8071 }, "end": { "local": "2037-02-03T20:59:28+02:00", "utc": "2037-02-03T18:59:28Z", "ms": 2117300368346.8071 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:20 on Tue 3 Feb to 02:13 on Wed 4 Feb.", "fact": "2037-02-03T03:19:39Z → 2037-02-04T00:12:33Z" }, { "step": "kaala", "text": "Moonrise is at 19:52 on the 2nd and 20:59 on the 3rd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 2nd and is on the 3rd.", "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 18785 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Tuesday 3 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": "2037-02-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-03", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Tuesday 3 February. Caturthī runs from 05:20 on Tue 3 Feb to 02:13 on Wed 4 Feb and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-02-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-02-10", "festival": "ekadashi", "name": "Vijayā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32259, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-02-09T20:19:21+02:00", "utc": "2037-02-09T18:19:21Z", "ms": 2117816361393.9404 }, "end": { "local": "2037-02-10T21:40:51+02:00", "utc": "2037-02-10T19:40:51Z", "ms": 2117907651208.2808 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-09T20:19:21+02:00", "utc": "2037-02-09T18:19:21Z", "ms": 2117816361393.9404 }, "end": { "local": "2037-02-10T21:40:51+02:00", "utc": "2037-02-10T19:40:51Z", "ms": 2117907651208.2808 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-02-10", "window": { "start": { "local": "2037-02-10T06:39:18+02:00", "utc": "2037-02-10T04:39:18Z", "ms": 2117853558385.1038 }, "end": { "local": "2037-02-10T06:39:18+02:00", "utc": "2037-02-10T04:39:18Z", "ms": 2117853558385.1038 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-02-11", "window": { "start": { "local": "2037-02-11T06:38:30+02:00", "utc": "2037-02-11T04:38:30Z", "ms": 2117939910311.4075 }, "end": { "local": "2037-02-11T06:38:30+02:00", "utc": "2037-02-11T04:38:30Z", "ms": 2117939910311.4075 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 20:19 on Mon 9 Feb to 21:41 on Tue 10 Feb.", "fact": "2037-02-09T18:19:21Z → 2037-02-10T19:40:51Z" }, { "step": "kaala", "text": "Sunrise is at 06:39 on the 10th and 06:39 on the 11th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 10th and is not 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 32259 s" }, { "step": "ruling", "text": "Vijayā Ekādaśī, Giza, 2037: Tuesday 10 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": "2037-02-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-10", "confidence": "determinate" } ], "quote": "In Giza, Vijayā Ekādaśī 2037 falls on Tuesday 10 February. Ekādaśī runs from 20:19 on Mon 9 Feb to 21:41 on Tue 10 Feb and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-02-10", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-02-12", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 14876, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-02-11T23:32:06+02:00", "utc": "2037-02-11T21:32:06Z", "ms": 2118000726330.1282 }, "end": { "local": "2037-02-13T01:46:03+02:00", "utc": "2037-02-12T23:46:03Z", "ms": 2118095162754.4153 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-11T23:32:06+02:00", "utc": "2037-02-11T21:32:06Z", "ms": 2118000726330.1282 }, "end": { "local": "2037-02-13T01:46:03+02:00", "utc": "2037-02-12T23:46:03Z", "ms": 2118095162754.4153 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-02-11", "window": { "start": { "local": "2037-02-11T17:40:33+02:00", "utc": "2037-02-11T15:40:33Z", "ms": 2117979633181.0896 }, "end": { "local": "2037-02-11T19:24:10+02:00", "utc": "2037-02-11T17:24:10Z", "ms": 2117985850233.8218 } }, "covered_min": 0, "window_min": 104, "qualifies": false }, { "local_date": "2037-02-12", "window": { "start": { "local": "2037-02-12T17:41:21+02:00", "utc": "2037-02-12T15:41:21Z", "ms": 2118066081488.0347 }, "end": { "local": "2037-02-12T19:24:45+02:00", "utc": "2037-02-12T17:24:45Z", "ms": 2118072285383.665 } }, "covered_min": 103, "window_min": 103, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 23:32 on Wed 11 Feb to 01:46 on Fri 13 Feb.", "fact": "2037-02-11T21:32:06Z → 2037-02-12T23:46:03Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:41–19:24 on the 11th, 17:41–19:25 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 0 of 104 minutes on the 11th and 103 of 103 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 14876 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Thursday 12 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": "2037-02-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-12", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Thursday 12 February. Trayodaśī runs from 23:32 on Wed 11 Feb to 01:46 on Fri 13 Feb and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-02-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/maha-shivaratri", "festival": "maha-shivaratri", "name": "Mahāśivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4377, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-02-13T01:46:03+02:00", "utc": "2037-02-12T23:46:03Z", "ms": 2118095162754.4153 }, "end": { "local": "2037-02-14T04:15:37+02:00", "utc": "2037-02-14T02:15:37Z", "ms": 2118190536573.5 }, "month": { "amanta": 10, "purnimanta": 11, "adhika": false, "amanta_name": "Māgha", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-13T01:46:03+02:00", "utc": "2037-02-12T23:46:03Z", "ms": 2118095162754.4153 }, "end": { "local": "2037-02-14T04:15:37+02:00", "utc": "2037-02-14T02:15:37Z", "ms": 2118190536573.5 } }, "kaala": "nishita", "days": [ { "local_date": "2037-02-12", "window": { "start": { "local": "2037-02-12T23:45:06+02:00", "utc": "2037-02-12T21:45:06Z", "ms": 2118087906096.6482 }, "end": { "local": "2037-02-13T00:33:06+02:00", "utc": "2037-02-12T22:33:06Z", "ms": 2118090786096.6482 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-02-13", "window": { "start": { "local": "2037-02-13T23:45:04+02:00", "utc": "2037-02-13T21:45:04Z", "ms": 2118174304331.8818 }, "end": { "local": "2037-02-14T00:33:04+02:00", "utc": "2037-02-13T22:33:04Z", "ms": 2118177184331.8818 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 01:46 on Fri 13 Feb to 04:16 on Sat 14 Feb.", "fact": "2037-02-12T23:46:03Z → 2037-02-14T02:15:37Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:45–00:33 on the 12th, 23:45–00:33 on the 13th.", "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 12th and 48 of 48 on the 13th.", "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 4377 s" }, { "step": "ruling", "text": "Mahāśivarātri, Giza, 2037: Friday 13 February.", "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": "2037-02-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-13", "confidence": "determinate" } ], "quote": "In Giza, Mahāśivarātri 2037 falls on Friday 13 February. Caturdaśī runs from 01:46 on Fri 13 Feb to 04:16 on Sat 14 Feb and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-02-19", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7678, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-02-18T14:41:11+02:00", "utc": "2037-02-18T12:41:11Z", "ms": 2118573671020.964 }, "end": { "local": "2037-02-19T16:52:42+02:00", "utc": "2037-02-19T14:52:42Z", "ms": 2118667961718.0393 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-18T14:41:11+02:00", "utc": "2037-02-18T12:41:11Z", "ms": 2118573671020.964 }, "end": { "local": "2037-02-19T16:52:42+02:00", "utc": "2037-02-19T14:52:42Z", "ms": 2118667961718.0393 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-02-18", "window": { "start": { "local": "2037-02-18T11:45:13+02:00", "utc": "2037-02-18T09:45:13Z", "ms": 2118563113136.395 }, "end": { "local": "2037-02-18T12:33:13+02:00", "utc": "2037-02-18T10:33:13Z", "ms": 2118565993136.395 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-02-19", "window": { "start": { "local": "2037-02-19T11:45:08+02:00", "utc": "2037-02-19T09:45:08Z", "ms": 2118649507636.402 }, "end": { "local": "2037-02-19T12:33:08+02:00", "utc": "2037-02-19T10:33:08Z", "ms": 2118652387636.402 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 14:41 on Wed 18 Feb to 16:53 on Thu 19 Feb.", "fact": "2037-02-18T12:41:11Z → 2037-02-19T14:52:42Z" }, { "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": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 18th and 48 of 48 on the 19th.", "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 7678 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Thursday 19 February.", "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": "2037-02-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-19", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Thursday 19 February. Caturthī runs from 14:41 on Wed 18 Feb to 16:53 on Thu 19 Feb and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-02-19", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-02-26", "festival": "ekadashi", "name": "Āmalakī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34685, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-02-25T18:15:33+02:00", "utc": "2037-02-25T16:15:33Z", "ms": 2119191332815.6406 }, "end": { "local": "2037-02-26T16:02:30+02:00", "utc": "2037-02-26T14:02:30Z", "ms": 2119269749573.2952 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-25T18:15:33+02:00", "utc": "2037-02-25T16:15:33Z", "ms": 2119191332815.6406 }, "end": { "local": "2037-02-26T16:02:30+02:00", "utc": "2037-02-26T14:02:30Z", "ms": 2119269749573.2952 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-02-25", "window": { "start": { "local": "2037-02-25T06:25:27+02:00", "utc": "2037-02-25T04:25:27Z", "ms": 2119148726872.7368 }, "end": { "local": "2037-02-25T06:25:27+02:00", "utc": "2037-02-25T04:25:27Z", "ms": 2119148726872.7368 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-02-26", "window": { "start": { "local": "2037-02-26T06:24:24+02:00", "utc": "2037-02-26T04:24:24Z", "ms": 2119235064089.827 }, "end": { "local": "2037-02-26T06:24:24+02:00", "utc": "2037-02-26T04:24:24Z", "ms": 2119235064089.827 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 18:16 on Wed 25 Feb to 16:02 on Thu 26 Feb.", "fact": "2037-02-25T16:15:33Z → 2037-02-26T14:02:30Z" }, { "step": "kaala", "text": "Sunrise is at 06:25 on the 25th and 06:24 on the 26th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 25th and is 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 34685 s" }, { "step": "ruling", "text": "Āmalakī Ekādaśī, Giza, 2037: Thursday 26 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": "2037-02-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-26", "confidence": "determinate" } ], "quote": "In Giza, Āmalakī Ekādaśī 2037 falls on Thursday 26 February. Ekādaśī runs from 18:16 on Wed 25 Feb to 16:02 on Thu 26 Feb and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-02-26", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-02-27", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-02-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16765, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-02-27T13:13:15+02:00", "utc": "2037-02-27T11:13:15Z", "ms": 2119345995150.0208 }, "end": { "local": "2037-02-28T09:55:06+02:00", "utc": "2037-02-28T07:55:06Z", "ms": 2119420506114.0928 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-02-27T13:13:15+02:00", "utc": "2037-02-27T11:13:15Z", "ms": 2119345995150.0208 }, "end": { "local": "2037-02-28T09:55:06+02:00", "utc": "2037-02-28T07:55:06Z", "ms": 2119420506114.0928 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-02-27", "window": { "start": { "local": "2037-02-27T17:52:40+02:00", "utc": "2037-02-27T15:52:40Z", "ms": 2119362760220.4673 }, "end": { "local": "2037-02-27T19:32:37+02:00", "utc": "2037-02-27T17:32:37Z", "ms": 2119368757029.678 } }, "covered_min": 100, "window_min": 100, "qualifies": true }, { "local_date": "2037-02-28", "window": { "start": { "local": "2037-02-28T17:53:22+02:00", "utc": "2037-02-28T15:53:22Z", "ms": 2119449202346.389 }, "end": { "local": "2037-02-28T19:33:05+02:00", "utc": "2037-02-28T17:33:05Z", "ms": 2119455184878.5105 } }, "covered_min": 0, "window_min": 100, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 13:13 on Fri 27 Feb to 09:55 on Sat 28 Feb.", "fact": "2037-02-27T11:13:15Z → 2037-02-28T07:55:06Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:53–19:33 on the 27th, 17:53–19:33 on the 28th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 100 of 100 minutes on the 27th and 0 of 100 on the 28th.", "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 16765 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Friday 27 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": "2037-02-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-02-27", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Friday 27 February. Trayodaśī runs from 13:13 on Fri 27 Feb to 09:55 on Sat 28 Feb and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-02-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/holika-dahana", "festival": "holika-dahana", "name": "Holikā Dahana", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30849, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-03-01T06:16:49+02:00", "utc": "2037-03-01T04:16:49Z", "ms": 2119493808786.1697 }, "end": { "local": "2037-03-02T02:28:13+02:00", "utc": "2037-03-02T00:28:13Z", "ms": 2119566492926.4375 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-03-01T06:16:49+02:00", "utc": "2037-03-01T04:16:49Z", "ms": 2119493808786.1697 }, "end": { "local": "2037-03-02T02:28:13+02:00", "utc": "2037-03-02T00:28:13Z", "ms": 2119566492926.4375 } }, "kaala": "sayahna", "days": [ { "local_date": "2037-02-28", "window": { "start": { "local": "2037-02-28T15:35:09+02:00", "utc": "2037-02-28T13:35:09Z", "ms": 2119440909135.0208 }, "end": { "local": "2037-02-28T17:53:22+02:00", "utc": "2037-02-28T15:53:22Z", "ms": 2119449202346.389 } }, "covered_min": 0, "window_min": 138, "qualifies": false }, { "local_date": "2037-03-01", "window": { "start": { "local": "2037-03-01T15:35:30+02:00", "utc": "2037-03-01T13:35:30Z", "ms": 2119527329557.6458 }, "end": { "local": "2037-03-01T17:54:04+02:00", "utc": "2037-03-01T15:54:04Z", "ms": 2119535644112.7322 } }, "covered_min": 139, "window_min": 139, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:17 on Sun 1 Mar to 02:28 on Mon 2 Mar.", "fact": "2037-03-01T04:16:49Z → 2037-03-02T00:28:13Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 15:35–17:53 on the 28th, 15:35–17:54 on the 1st.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during sāyāhna. It covers 0 of 138 minutes on the 28th and 139 of 139 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one late afternoon qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 30849 s" }, { "step": "ruling", "text": "Holikā Dahana, Giza, 2037: Sunday 1 March.", "fact": "confidence: determinate" } ], "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": "2037-03-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-01", "confidence": "determinate" } ], "quote": "In Giza, Holikā Dahana 2037 falls on Sunday 1 March. Pūrṇimā runs from 06:17 on Sun 1 Mar to 02:28 on Mon 2 Mar and covers all of sāyāhna that late afternoon.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/holi", "festival": "holi", "name": "Holī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30849, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-03-01T06:16:49+02:00", "utc": "2037-03-01T04:16:49Z", "ms": 2119493808786.1697 }, "end": { "local": "2037-03-02T02:28:13+02:00", "utc": "2037-03-02T00:28:13Z", "ms": 2119566492926.4375 }, "month": { "amanta": 11, "purnimanta": 11, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Phālguna" } }, "span": { "of": "tithi", "start": { "local": "2037-03-01T06:16:49+02:00", "utc": "2037-03-01T04:16:49Z", "ms": 2119493808786.1697 }, "end": { "local": "2037-03-02T02:28:13+02:00", "utc": "2037-03-02T00:28:13Z", "ms": 2119566492926.4375 } }, "kaala": "sayahna", "days": [ { "local_date": "2037-02-28", "window": { "start": { "local": "2037-02-28T15:35:09+02:00", "utc": "2037-02-28T13:35:09Z", "ms": 2119440909135.0208 }, "end": { "local": "2037-02-28T17:53:22+02:00", "utc": "2037-02-28T15:53:22Z", "ms": 2119449202346.389 } }, "covered_min": 0, "window_min": 138, "qualifies": false }, { "local_date": "2037-03-01", "window": { "start": { "local": "2037-03-01T15:35:30+02:00", "utc": "2037-03-01T13:35:30Z", "ms": 2119527329557.6458 }, "end": { "local": "2037-03-01T17:54:04+02:00", "utc": "2037-03-01T15:54:04Z", "ms": 2119535644112.7322 } }, "covered_min": 139, "window_min": 139, "qualifies": true } ], "follows": { "festival": "holika-dahana", "name": "Holikā Dahana", "local_date": "2037-03-01", "days": 1 }, "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:17 on Sun 1 Mar to 02:28 on Mon 2 Mar.", "fact": "2037-03-01T04:16:49Z → 2037-03-02T00:28:13Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 15:35–17:53 on the 28th, 15:35–17:54 on the 1st.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during sāyāhna. It covers 0 of 138 minutes on the 28th and 139 of 139 on the 1st.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105" }, { "step": "tie_break", "text": "Only one late afternoon qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 30849 s" }, { "step": "counted", "text": "Holī is kept the day after Holikā Dahana: Sunday 1 March is the day taken above.", "fact": "follows: holika-dahana + 1 d" }, { "step": "ruling", "text": "Holī, Giza, 2037: Monday 2 March.", "fact": "confidence: determinate" } ], "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": "2037-03-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-02", "confidence": "determinate" } ], "quote": "In Giza, Holī 2037 falls on Monday 2 March. It is kept the day after Holikā Dahana, which falls on Sunday 1 March. Pūrṇimā runs from 06:17 on Sun 1 Mar to 02:28 on Mon 2 Mar and covers all of sāyāhna on the 1st.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vasantotsava", "festival": "vasantotsava", "name": "Vasantotsava", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13913, "anga": { "type": "tithi", "index": 15, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-03-02T02:28:13+02:00", "utc": "2037-03-02T00:28:13Z", "ms": 2119566492926.4375 }, "end": { "local": "2037-03-02T22:39:48+02:00", "utc": "2037-03-02T20:39:48Z", "ms": 2119639188442.4778 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-02T02:28:13+02:00", "utc": "2037-03-02T00:28:13Z", "ms": 2119566492926.4375 }, "end": { "local": "2037-03-02T22:39:48+02:00", "utc": "2037-03-02T20:39:48Z", "ms": 2119639188442.4778 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-03-02", "window": { "start": { "local": "2037-03-02T06:20:06+02:00", "utc": "2037-03-02T04:20:06Z", "ms": 2119580405727.9001 }, "end": { "local": "2037-03-02T06:20:06+02:00", "utc": "2037-03-02T04:20:06Z", "ms": 2119580405727.9001 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-03-03", "window": { "start": { "local": "2037-03-03T06:18:59+02:00", "utc": "2037-03-03T04:18:59Z", "ms": 2119666739494.6655 }, "end": { "local": "2037-03-03T06:18:59+02:00", "utc": "2037-03-03T04:18:59Z", "ms": 2119666739494.6655 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 02:28 on Mon 2 Mar to 22:40 on Mon 2 Mar.", "fact": "2037-03-02T00:28:13Z → 2037-03-02T20:39:48Z" }, { "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": "Pratipadā 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: purvaviddha → only-day · margin 13913 s" }, { "step": "ruling", "text": "Vasantotsava, Giza, 2037: Monday 2 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": "2037-03-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-02", "confidence": "determinate" } ], "quote": "In Giza, Vasantotsava 2037 falls on Monday 2 March. Pratipadā runs from 02:28 on Mon 2 Mar to 22:40 on Mon 2 Mar and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-03-04", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18218, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-03-04T15:46:40+02:00", "utc": "2037-03-04T13:46:40Z", "ms": 2119787199680.1367 }, "end": { "local": "2037-03-05T13:02:43+02:00", "utc": "2037-03-05T11:02:43Z", "ms": 2119863762993.938 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-04T15:46:40+02:00", "utc": "2037-03-04T13:46:40Z", "ms": 2119787199680.1367 }, "end": { "local": "2037-03-05T13:02:43+02:00", "utc": "2037-03-05T11:02:43Z", "ms": 2119863762993.938 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-03-04", "window": { "start": { "local": "2037-03-04T20:50:18+02:00", "utc": "2037-03-04T18:50:18Z", "ms": 2119805417552.3726 }, "end": { "local": "2037-03-04T20:50:18+02:00", "utc": "2037-03-04T18:50:18Z", "ms": 2119805417552.3726 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-03-05", "window": { "start": { "local": "2037-03-05T21:54:53+02:00", "utc": "2037-03-05T19:54:53Z", "ms": 2119895693450.516 }, "end": { "local": "2037-03-05T21:54:53+02:00", "utc": "2037-03-05T19:54:53Z", "ms": 2119895693450.516 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 15:47 on Wed 4 Mar to 13:03 on Thu 5 Mar.", "fact": "2037-03-04T13:46:40Z → 2037-03-05T11:02:43Z" }, { "step": "kaala", "text": "Moonrise is at 20:50 on the 4th and 21:55 on the 5th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 4th and is not on the 5th.", "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 18218 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Wednesday 4 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": "2037-03-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-04", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Wednesday 4 March. Caturthī runs from 15:47 on Wed 4 Mar to 13:03 on Thu 5 Mar and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-03-04", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shitalashtami", "festival": "shitalashtami", "name": "Śītalāṣṭamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7037, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-03-08T09:18:27+02:00", "utc": "2037-03-08T07:18:27Z", "ms": 2120109506830.799 }, "end": { "local": "2037-03-09T09:44:31+02:00", "utc": "2037-03-09T07:44:31Z", "ms": 2120197471479.3726 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-08T09:18:27+02:00", "utc": "2037-03-08T07:18:27Z", "ms": 2120109506830.799 }, "end": { "local": "2037-03-09T09:44:31+02:00", "utc": "2037-03-09T07:44:31Z", "ms": 2120197471479.3726 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-08", "window": { "start": { "local": "2037-03-08T11:42:04+02:00", "utc": "2037-03-08T09:42:04Z", "ms": 2120118123849.161 }, "end": { "local": "2037-03-08T12:30:04+02:00", "utc": "2037-03-08T10:30:04Z", "ms": 2120121003849.161 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-09", "window": { "start": { "local": "2037-03-09T11:41:49+02:00", "utc": "2037-03-09T09:41:49Z", "ms": 2120204508887.2412 }, "end": { "local": "2037-03-09T12:29:49+02:00", "utc": "2037-03-09T10:29:49Z", "ms": 2120207388887.2412 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 09:18 on Sun 8 Mar to 09:45 on Mon 9 Mar.", "fact": "2037-03-08T07:18:27Z → 2037-03-09T07:44:31Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:42–12:30 on the 8th, 11:42–12:30 on the 9th.", "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 8th and 0 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 7037 s" }, { "step": "ruling", "text": "Śītalāṣṭamī, Giza, 2037: Sunday 8 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": "2037-03-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-08", "confidence": "determinate" } ], "quote": "In Giza, Śītalāṣṭamī 2037 falls on Sunday 8 March. Aṣṭamī runs from 09:18 on Sun 8 Mar to 09:45 on Mon 9 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-03-12", "festival": "ekadashi", "name": "Pāpamocanī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23960, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-03-11T12:49:11+02:00", "utc": "2037-03-11T10:49:11Z", "ms": 2120381351428.6948 }, "end": { "local": "2037-03-12T15:09:13+02:00", "utc": "2037-03-12T13:09:13Z", "ms": 2120476152989.637 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-11T12:49:11+02:00", "utc": "2037-03-11T10:49:11Z", "ms": 2120381351428.6948 }, "end": { "local": "2037-03-12T15:09:13+02:00", "utc": "2037-03-12T13:09:13Z", "ms": 2120476152989.637 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-03-11", "window": { "start": { "local": "2037-03-11T06:09:51+02:00", "utc": "2037-03-11T04:09:51Z", "ms": 2120357390979.566 }, "end": { "local": "2037-03-11T06:09:51+02:00", "utc": "2037-03-11T04:09:51Z", "ms": 2120357390979.566 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-03-12", "window": { "start": { "local": "2037-03-12T06:08:41+02:00", "utc": "2037-03-12T04:08:41Z", "ms": 2120443720528.426 }, "end": { "local": "2037-03-12T06:08:41+02:00", "utc": "2037-03-12T04:08:41Z", "ms": 2120443720528.426 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 12:49 on Wed 11 Mar to 15:09 on Thu 12 Mar.", "fact": "2037-03-11T10:49:11Z → 2037-03-12T13:09:13Z" }, { "step": "kaala", "text": "Sunrise is at 06:10 on the 11th and 06:09 on the 12th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 11th and is on the 12th.", "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 23960 s" }, { "step": "ruling", "text": "Pāpamocanī Ekādaśī, Giza, 2037: Thursday 12 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": "2037-03-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-12", "confidence": "determinate" } ], "quote": "In Giza, Pāpamocanī Ekādaśī 2037 falls on Thursday 12 March. Ekādaśī runs from 12:49 on Wed 11 Mar to 15:09 on Thu 12 Mar and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-03-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-03-13", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-13", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 968, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-03-13T17:45:55+02:00", "utc": "2037-03-13T15:45:55Z", "ms": 2120571954642.7598 }, "end": { "local": "2037-03-14T20:28:20+02:00", "utc": "2037-03-14T18:28:20Z", "ms": 2120668100477.668 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-13T17:45:55+02:00", "utc": "2037-03-13T15:45:55Z", "ms": 2120571954642.7598 }, "end": { "local": "2037-03-14T20:28:20+02:00", "utc": "2037-03-14T18:28:20Z", "ms": 2120668100477.668 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-03-13", "window": { "start": { "local": "2037-03-13T18:02:02+02:00", "utc": "2037-03-13T16:02:02Z", "ms": 2120572922145.319 }, "end": { "local": "2037-03-13T19:38:36+02:00", "utc": "2037-03-13T17:38:36Z", "ms": 2120578716349.0815 } }, "covered_min": 97, "window_min": 97, "qualifies": true }, { "local_date": "2037-03-14", "window": { "start": { "local": "2037-03-14T18:02:40+02:00", "utc": "2037-03-14T16:02:40Z", "ms": 2120659360389.1382 }, "end": { "local": "2037-03-14T19:39:00+02:00", "utc": "2037-03-14T17:39:00Z", "ms": 2120665139980.294 } }, "covered_min": 96, "window_min": 96, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 17:46 on Fri 13 Mar to 20:28 on Sat 14 Mar.", "fact": "2037-03-13T15:45:55Z → 2037-03-14T18:28:20Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:02–19:39 on the 13th, 18:03–19:39 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 97 of 97 minutes on the 13th and 96 of 96 on the 14th.", "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 968 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Friday 13 March.", "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": "2037-03-13", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-13", "confidence": "boundary" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Friday 13 March. Trayodaśī runs from 17:46 on Fri 13 Mar to 20:28 on Sat 14 Mar and covers all of pradoṣa that evening. It also reaches the next evening for 96 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/giza/festivals/2037/pradosha-vrata?on=2037-03-13", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-03-14", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1933, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-03-14T20:28:20+02:00", "utc": "2037-03-14T18:28:20Z", "ms": 2120668100477.668 }, "end": { "local": "2037-03-15T23:07:24+02:00", "utc": "2037-03-15T21:07:24Z", "ms": 2120764044369.1772 }, "month": { "amanta": 11, "purnimanta": 0, "adhika": false, "amanta_name": "Phālguna", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-14T20:28:20+02:00", "utc": "2037-03-14T18:28:20Z", "ms": 2120668100477.668 }, "end": { "local": "2037-03-15T23:07:24+02:00", "utc": "2037-03-15T21:07:24Z", "ms": 2120764044369.1772 } }, "kaala": "nishita", "days": [ { "local_date": "2037-03-14", "window": { "start": { "local": "2037-03-14T23:39:54+02:00", "utc": "2037-03-14T21:39:54Z", "ms": 2120679593855.9727 }, "end": { "local": "2037-03-15T00:27:54+02:00", "utc": "2037-03-14T22:27:54Z", "ms": 2120682473855.9727 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-15", "window": { "start": { "local": "2037-03-15T23:39:37+02:00", "utc": "2037-03-15T21:39:37Z", "ms": 2120765977078.2832 }, "end": { "local": "2037-03-16T00:27:37+02:00", "utc": "2037-03-15T22:27:37Z", "ms": 2120768857078.2832 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 20:28 on Sat 14 Mar to 23:07 on Sun 15 Mar.", "fact": "2037-03-14T18:28:20Z → 2037-03-15T21:07:24Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:40–00:28 on the 14th, 23:40–00:28 on the 15th.", "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 14th and 0 of 48 on the 15th.", "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 1933 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Saturday 14 March.", "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": "2037-03-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-14", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Saturday 14 March. Caturdaśī runs from 20:28 on Sat 14 Mar to 23:07 on Sun 15 Mar and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-03-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/navaratra-arambha-caitra", "festival": "navaratra-arambha-caitra", "name": "Navarātrārambha (Caitra)", "everyday": "Chaitra Navratri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28153, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-03-17T01:36:16+02:00", "utc": "2037-03-16T23:36:16Z", "ms": 2120859376271.6536 }, "end": { "local": "2037-03-18T03:50:08+02:00", "utc": "2037-03-18T01:50:08Z", "ms": 2120953808174.837 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-17T01:36:16+02:00", "utc": "2037-03-16T23:36:16Z", "ms": 2120859376271.6536 }, "end": { "local": "2037-03-18T03:50:08+02:00", "utc": "2037-03-18T01:50:08Z", "ms": 2120953808174.837 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-17", "window": { "start": { "local": "2037-03-17T11:39:39+02:00", "utc": "2037-03-17T09:39:39Z", "ms": 2120895578927.066 }, "end": { "local": "2037-03-17T12:27:39+02:00", "utc": "2037-03-17T10:27:39Z", "ms": 2120898458927.066 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-18", "window": { "start": { "local": "2037-03-18T11:39:22+02:00", "utc": "2037-03-18T09:39:22Z", "ms": 2120981961665.5952 }, "end": { "local": "2037-03-18T12:27:22+02:00", "utc": "2037-03-18T10:27:22Z", "ms": 2120984841665.5952 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 01:36 on Tue 17 Mar to 03:50 on Wed 18 Mar.", "fact": "2037-03-16T23:36:16Z → 2037-03-18T01:50:08Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:40–12:28 on the 17th, 11:39–12:27 on the 18th.", "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 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 28153 s" }, { "step": "ruling", "text": "Navarātrārambha (Caitra), Giza, 2037: Tuesday 17 March.", "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": "2037-03-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-17", "confidence": "determinate" } ], "quote": "In Giza, Navarātrārambha (Caitra) (Chaitra Navratri) 2037 falls on Tuesday 17 March. Pratipadā runs from 01:36 on Tue 17 Mar to 03:50 on Wed 18 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/gauri-tritiya", "festival": "gauri-tritiya", "name": "Gaurī Tṛtīyā", "everyday": "Gangaur", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15539, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-03-19T05:45:35+02:00", "utc": "2037-03-19T03:45:35Z", "ms": 2121047134831.769 }, "end": { "local": "2037-03-20T07:19:47+02:00", "utc": "2037-03-20T05:19:47Z", "ms": 2121139187475.2488 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-19T05:45:35+02:00", "utc": "2037-03-19T03:45:35Z", "ms": 2121047134831.769 }, "end": { "local": "2037-03-20T07:19:47+02:00", "utc": "2037-03-20T05:19:47Z", "ms": 2121139187475.2488 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-19", "window": { "start": { "local": "2037-03-19T11:39:04+02:00", "utc": "2037-03-19T09:39:04Z", "ms": 2121068344236.3145 }, "end": { "local": "2037-03-19T12:27:04+02:00", "utc": "2037-03-19T10:27:04Z", "ms": 2121071224236.3145 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-20", "window": { "start": { "local": "2037-03-20T11:38:47+02:00", "utc": "2037-03-20T09:38:47Z", "ms": 2121154726656.609 }, "end": { "local": "2037-03-20T12:26:47+02:00", "utc": "2037-03-20T10:26:47Z", "ms": 2121157606656.609 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 05:46 on Thu 19 Mar to 07:20 on Fri 20 Mar.", "fact": "2037-03-19T03:45:35Z → 2037-03-20T05:19:47Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 19th, 11:39–12:27 on the 20th.", "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 19th and 0 of 48 on the 20th.", "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 15539 s" }, { "step": "ruling", "text": "Gaurī Tṛtīyā, Giza, 2037: Thursday 19 March.", "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": "2037-03-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-19", "confidence": "determinate" } ], "quote": "In Giza, Gaurī Tṛtīyā (Gangaur) 2037 falls on Thursday 19 March. Tṛtīyā runs from 05:46 on Thu 19 Mar to 07:20 on Fri 20 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/saubhagya-shayana-vrata", "festival": "saubhagya-shayana-vrata", "name": "Saubhāgya Śayana Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15539, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-03-19T05:45:35+02:00", "utc": "2037-03-19T03:45:35Z", "ms": 2121047134831.769 }, "end": { "local": "2037-03-20T07:19:47+02:00", "utc": "2037-03-20T05:19:47Z", "ms": 2121139187475.2488 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-19T05:45:35+02:00", "utc": "2037-03-19T03:45:35Z", "ms": 2121047134831.769 }, "end": { "local": "2037-03-20T07:19:47+02:00", "utc": "2037-03-20T05:19:47Z", "ms": 2121139187475.2488 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-19", "window": { "start": { "local": "2037-03-19T11:39:04+02:00", "utc": "2037-03-19T09:39:04Z", "ms": 2121068344236.3145 }, "end": { "local": "2037-03-19T12:27:04+02:00", "utc": "2037-03-19T10:27:04Z", "ms": 2121071224236.3145 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-20", "window": { "start": { "local": "2037-03-20T11:38:47+02:00", "utc": "2037-03-20T09:38:47Z", "ms": 2121154726656.609 }, "end": { "local": "2037-03-20T12:26:47+02:00", "utc": "2037-03-20T10:26:47Z", "ms": 2121157606656.609 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 05:46 on Thu 19 Mar to 07:20 on Fri 20 Mar.", "fact": "2037-03-19T03:45:35Z → 2037-03-20T05:19:47Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 19th, 11:39–12:27 on the 20th.", "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 19th and 0 of 48 on the 20th.", "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 15539 s" }, { "step": "ruling", "text": "Saubhāgya Śayana Vrata, Giza, 2037: Thursday 19 March.", "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": "2037-03-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-19", "confidence": "determinate" } ], "quote": "In Giza, Saubhāgya Śayana Vrata 2037 falls on Thursday 19 March. Tṛtīyā runs from 05:46 on Thu 19 Mar to 07:20 on Fri 20 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-03-20", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11313, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-03-20T07:19:47+02:00", "utc": "2037-03-20T05:19:47Z", "ms": 2121139187475.2488 }, "end": { "local": "2037-03-21T08:29:56+02:00", "utc": "2037-03-21T06:29:56Z", "ms": 2121229796235.4883 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-20T07:19:47+02:00", "utc": "2037-03-20T05:19:47Z", "ms": 2121139187475.2488 }, "end": { "local": "2037-03-21T08:29:56+02:00", "utc": "2037-03-21T06:29:56Z", "ms": 2121229796235.4883 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-20", "window": { "start": { "local": "2037-03-20T11:38:47+02:00", "utc": "2037-03-20T09:38:47Z", "ms": 2121154726656.609 }, "end": { "local": "2037-03-20T12:26:47+02:00", "utc": "2037-03-20T10:26:47Z", "ms": 2121157606656.609 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-21", "window": { "start": { "local": "2037-03-21T11:38:29+02:00", "utc": "2037-03-21T09:38:29Z", "ms": 2121241108943.995 }, "end": { "local": "2037-03-21T12:26:29+02:00", "utc": "2037-03-21T10:26:29Z", "ms": 2121243988943.995 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 07:20 on Fri 20 Mar to 08:30 on Sat 21 Mar.", "fact": "2037-03-20T05:19:47Z → 2037-03-21T06:29:56Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 20th, 11:38–12:26 on the 21st.", "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 20th and 0 of 48 on the 21st.", "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 11313 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Friday 20 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": "2037-03-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-20", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Friday 20 March. Caturthī runs from 07:20 on Fri 20 Mar to 08:30 on Sat 21 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-03-20", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/lakshmi-panchami", "festival": "lakshmi-panchami", "name": "Lakṣmī Pañcamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8719, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-03-21T08:29:56+02:00", "utc": "2037-03-21T06:29:56Z", "ms": 2121229796235.4883 }, "end": { "local": "2037-03-22T09:12:52+02:00", "utc": "2037-03-22T07:12:52Z", "ms": 2121318771974.197 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-21T08:29:56+02:00", "utc": "2037-03-21T06:29:56Z", "ms": 2121229796235.4883 }, "end": { "local": "2037-03-22T09:12:52+02:00", "utc": "2037-03-22T07:12:52Z", "ms": 2121318771974.197 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-21", "window": { "start": { "local": "2037-03-21T11:38:29+02:00", "utc": "2037-03-21T09:38:29Z", "ms": 2121241108943.995 }, "end": { "local": "2037-03-21T12:26:29+02:00", "utc": "2037-03-21T10:26:29Z", "ms": 2121243988943.995 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-22", "window": { "start": { "local": "2037-03-22T11:38:11+02:00", "utc": "2037-03-22T09:38:11Z", "ms": 2121327491116.2017 }, "end": { "local": "2037-03-22T12:26:11+02:00", "utc": "2037-03-22T10:26:11Z", "ms": 2121330371116.2017 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 08:30 on Sat 21 Mar to 09:13 on Sun 22 Mar.", "fact": "2037-03-21T06:29:56Z → 2037-03-22T07:12:52Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 21st, 11:38–12:26 on the 22nd.", "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 21st and 0 of 48 on the 22nd.", "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 8719 s" }, { "step": "ruling", "text": "Lakṣmī Pañcamī, Giza, 2037: Saturday 21 March.", "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": "2037-03-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-21", "confidence": "determinate" } ], "quote": "In Giza, Lakṣmī Pañcamī 2037 falls on Saturday 21 March. Pañcamī runs from 08:30 on Sat 21 Mar to 09:13 on Sun 22 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/bhavani-utpatti", "festival": "bhavani-utpatti", "name": "Bhavānī Utpatti", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9228, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-03-24T09:03:47+02:00", "utc": "2037-03-24T07:03:47Z", "ms": 2121491027229.1455 }, "end": { "local": "2037-03-25T08:06:21+02:00", "utc": "2037-03-25T06:06:21Z", "ms": 2121573981494.6982 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-24T09:03:47+02:00", "utc": "2037-03-24T07:03:47Z", "ms": 2121491027229.1455 }, "end": { "local": "2037-03-25T08:06:21+02:00", "utc": "2037-03-25T06:06:21Z", "ms": 2121573981494.6982 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-24", "window": { "start": { "local": "2037-03-24T11:37:35+02:00", "utc": "2037-03-24T09:37:35Z", "ms": 2121500255187.6414 }, "end": { "local": "2037-03-24T12:25:35+02:00", "utc": "2037-03-24T10:25:35Z", "ms": 2121503135187.6414 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-25", "window": { "start": { "local": "2037-03-25T11:37:17+02:00", "utc": "2037-03-25T09:37:17Z", "ms": 2121586637124.357 }, "end": { "local": "2037-03-25T12:25:17+02:00", "utc": "2037-03-25T10:25:17Z", "ms": 2121589517124.357 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 09:04 on Tue 24 Mar to 08:06 on Wed 25 Mar.", "fact": "2037-03-24T07:03:47Z → 2037-03-25T06:06:21Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 24th, 11:37–12:25 on the 25th.", "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 24th and 0 of 48 on the 25th.", "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 9228 s" }, { "step": "ruling", "text": "Bhavānī Utpatti, Giza, 2037: Tuesday 24 March.", "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": "2037-03-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-24", "confidence": "determinate" } ], "quote": "In Giza, Bhavānī Utpatti 2037 falls on Tuesday 24 March. Aṣṭamī runs from 09:04 on Tue 24 Mar to 08:06 on Wed 25 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/rama-navami", "festival": "rama-navami", "name": "Rāma Navamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12656, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "2037-03-25T08:06:21+02:00", "utc": "2037-03-25T06:06:21Z", "ms": 2121573981494.6982 }, "end": { "local": "2037-03-26T06:32:11+02:00", "utc": "2037-03-26T04:32:11Z", "ms": 2121654731154.903 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-25T08:06:21+02:00", "utc": "2037-03-25T06:06:21Z", "ms": 2121573981494.6982 }, "end": { "local": "2037-03-26T06:32:11+02:00", "utc": "2037-03-26T04:32:11Z", "ms": 2121654731154.903 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-25", "window": { "start": { "local": "2037-03-25T11:37:17+02:00", "utc": "2037-03-25T09:37:17Z", "ms": 2121586637124.357 }, "end": { "local": "2037-03-25T12:25:17+02:00", "utc": "2037-03-25T10:25:17Z", "ms": 2121589517124.357 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-03-26", "window": { "start": { "local": "2037-03-26T11:36:59+02:00", "utc": "2037-03-26T09:36:59Z", "ms": 2121673019021.1772 }, "end": { "local": "2037-03-26T12:24:59+02:00", "utc": "2037-03-26T10:24:59Z", "ms": 2121675899021.1772 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Navamī runs from 08:06 on Wed 25 Mar to 06:32 on Thu 26 Mar.", "fact": "2037-03-25T06:06:21Z → 2037-03-26T04:32:11Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 25th, 11:37–12:25 on the 26th.", "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 25th and 0 of 48 on the 26th.", "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 12656 s" }, { "step": "ruling", "text": "Rāma Navamī, Giza, 2037: Wednesday 25 March.", "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": "2037-03-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-25", "confidence": "determinate" } ], "quote": "In Giza, Rāma Navamī 2037 falls on Wednesday 25 March. Navamī runs from 08:06 on Wed 25 Mar to 06:32 on Thu 26 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-03-27", "festival": "ekadashi", "name": "Kāmadā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5286, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-03-27T04:22:33+02:00", "utc": "2037-03-27T02:22:33Z", "ms": 2121733353463.2395 }, "end": { "local": "2037-03-28T01:40:58+02:00", "utc": "2037-03-27T23:40:58Z", "ms": 2121810058329.32 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-27T04:22:33+02:00", "utc": "2037-03-27T02:22:33Z", "ms": 2121733353463.2395 }, "end": { "local": "2037-03-28T01:40:58+02:00", "utc": "2037-03-27T23:40:58Z", "ms": 2121810058329.32 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-03-27", "window": { "start": { "local": "2037-03-27T05:50:39+02:00", "utc": "2037-03-27T03:50:39Z", "ms": 2121738639262.6885 }, "end": { "local": "2037-03-27T05:50:39+02:00", "utc": "2037-03-27T03:50:39Z", "ms": 2121738639262.6885 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-03-28", "window": { "start": { "local": "2037-03-28T05:49:27+02:00", "utc": "2037-03-28T03:49:27Z", "ms": 2121824966746.251 }, "end": { "local": "2037-03-28T05:49:27+02:00", "utc": "2037-03-28T03:49:27Z", "ms": 2121824966746.251 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 04:23 on Fri 27 Mar to 01:41 on Sat 28 Mar.", "fact": "2037-03-27T02:22:33Z → 2037-03-27T23:40:58Z" }, { "step": "kaala", "text": "Sunrise is at 05:51 on the 27th and 05:49 on the 28th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 27th and is not 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 5286 s" }, { "step": "ruling", "text": "Kāmadā Ekādaśī, Giza, 2037: Friday 27 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": "2037-03-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-27", "confidence": "determinate" } ], "quote": "In Giza, Kāmadā Ekādaśī 2037 falls on Friday 27 March. Ekādaśī runs from 04:23 on Fri 27 Mar to 01:41 on Sat 28 Mar and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-03-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ananga-trayodashi", "festival": "ananga-trayodashi", "name": "Anaṅga Trayodaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24136, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-03-28T22:33:04+02:00", "utc": "2037-03-28T20:33:04Z", "ms": 2121885183894.7764 }, "end": { "local": "2037-03-29T19:06:21+02:00", "utc": "2037-03-29T17:06:21Z", "ms": 2121959180565.1394 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-28T22:33:04+02:00", "utc": "2037-03-28T20:33:04Z", "ms": 2121885183894.7764 }, "end": { "local": "2037-03-29T19:06:21+02:00", "utc": "2037-03-29T17:06:21Z", "ms": 2121959180565.1394 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-28", "window": { "start": { "local": "2037-03-28T11:36:23+02:00", "utc": "2037-03-28T09:36:23Z", "ms": 2121845782779.0432 }, "end": { "local": "2037-03-28T12:24:23+02:00", "utc": "2037-03-28T10:24:23Z", "ms": 2121848662779.0432 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-03-29", "window": { "start": { "local": "2037-03-29T11:36:05+02:00", "utc": "2037-03-29T09:36:05Z", "ms": 2121932164684.8218 }, "end": { "local": "2037-03-29T12:24:05+02:00", "utc": "2037-03-29T10:24:05Z", "ms": 2121935044684.8218 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 22:33 on Sat 28 Mar to 19:06 on Sun 29 Mar.", "fact": "2037-03-28T20:33:04Z → 2037-03-29T17:06:21Z" }, { "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": "Trayodaśī must be present during madhyāhna. 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. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 24136 s" }, { "step": "ruling", "text": "Anaṅga Trayodaśī, Giza, 2037: Sunday 29 March.", "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": "2037-03-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-29", "confidence": "determinate" } ], "quote": "In Giza, Anaṅga Trayodaśī 2037 falls on Sunday 29 March. Trayodaśī runs from 22:33 on Sat 28 Mar to 19:06 on Sun 29 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-03-29", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2295, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-03-28T22:33:04+02:00", "utc": "2037-03-28T20:33:04Z", "ms": 2121885183894.7764 }, "end": { "local": "2037-03-29T19:06:21+02:00", "utc": "2037-03-29T17:06:21Z", "ms": 2121959180565.1394 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-28T22:33:04+02:00", "utc": "2037-03-28T20:33:04Z", "ms": 2121885183894.7764 }, "end": { "local": "2037-03-29T19:06:21+02:00", "utc": "2037-03-29T17:06:21Z", "ms": 2121959180565.1394 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-03-28", "window": { "start": { "local": "2037-03-28T18:11:19+02:00", "utc": "2037-03-28T16:11:19Z", "ms": 2121869478811.8354 }, "end": { "local": "2037-03-28T19:44:14+02:00", "utc": "2037-03-28T17:44:14Z", "ms": 2121875054214.989 } }, "covered_min": 0, "window_min": 93, "qualifies": false }, { "local_date": "2037-03-29", "window": { "start": { "local": "2037-03-29T18:11:55+02:00", "utc": "2037-03-29T16:11:55Z", "ms": 2121955915034.1567 }, "end": { "local": "2037-03-29T19:44:36+02:00", "utc": "2037-03-29T17:44:36Z", "ms": 2121961475971.1238 } }, "covered_min": 54, "window_min": 93, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 22:33 on Sat 28 Mar to 19:06 on Sun 29 Mar.", "fact": "2037-03-28T20:33:04Z → 2037-03-29T17:06:21Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:11–19:44 on the 28th, 18:12–19:45 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 93 minutes on the 28th and 54 of 93 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 2295 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Sunday 29 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": "2037-03-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-29", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Sunday 29 March. Trayodaśī runs from 22:33 on Sat 28 Mar to 19:06 on Sun 29 Mar and covers 54 of 93 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-03-29", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vishnu-damanaka-chaturdashi", "festival": "vishnu-damanaka-chaturdashi", "name": "Viṣṇudamanaka Caturdaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 11162, "anga": { "type": "tithi", "index": 13, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-03-29T19:06:21+02:00", "utc": "2037-03-29T17:06:21Z", "ms": 2121959180565.1394 }, "end": { "local": "2037-03-30T15:29:49+02:00", "utc": "2037-03-30T13:29:49Z", "ms": 2122032588949.5945 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-29T19:06:21+02:00", "utc": "2037-03-29T17:06:21Z", "ms": 2121959180565.1394 }, "end": { "local": "2037-03-30T15:29:49+02:00", "utc": "2037-03-30T13:29:49Z", "ms": 2122032588949.5945 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-29", "window": { "start": { "local": "2037-03-29T11:36:05+02:00", "utc": "2037-03-29T09:36:05Z", "ms": 2121932164684.8218 }, "end": { "local": "2037-03-29T12:24:05+02:00", "utc": "2037-03-29T10:24:05Z", "ms": 2121935044684.8218 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-03-30", "window": { "start": { "local": "2037-03-30T11:35:47+02:00", "utc": "2037-03-30T09:35:47Z", "ms": 2122018546640.0483 }, "end": { "local": "2037-03-30T12:23:47+02:00", "utc": "2037-03-30T10:23:47Z", "ms": 2122021426640.0483 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 19:06 on Sun 29 Mar to 15:30 on Mon 30 Mar.", "fact": "2037-03-29T17:06:21Z → 2037-03-30T13:29:49Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:36–12:24 on the 29th, 11:36–12:24 on the 30th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturdaśī 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. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 11162 s" }, { "step": "ruling", "text": "Viṣṇudamanaka Caturdaśī, Giza, 2037: Monday 30 March.", "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": "2037-03-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-30", "confidence": "determinate" } ], "quote": "In Giza, Viṣṇudamanaka Caturdaśī 2037 falls on Monday 30 March. Caturdaśī runs from 19:06 on Sun 29 Mar to 15:30 on Mon 30 Mar and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/chaitri-purnima", "festival": "chaitri-purnima", "name": "Caitrī Pūrṇimā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-03-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1087, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-03-30T15:29:49+02:00", "utc": "2037-03-30T13:29:49Z", "ms": 2122032588949.5945 }, "end": { "local": "2037-03-31T11:53:35+02:00", "utc": "2037-03-31T09:53:35Z", "ms": 2122106015441.342 }, "month": { "amanta": 0, "purnimanta": 0, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Caitra" } }, "span": { "of": "tithi", "start": { "local": "2037-03-30T15:29:49+02:00", "utc": "2037-03-30T13:29:49Z", "ms": 2122032588949.5945 }, "end": { "local": "2037-03-31T11:53:35+02:00", "utc": "2037-03-31T09:53:35Z", "ms": 2122106015441.342 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-03-30", "window": { "start": { "local": "2037-03-30T11:35:47+02:00", "utc": "2037-03-30T09:35:47Z", "ms": 2122018546640.0483 }, "end": { "local": "2037-03-30T12:23:47+02:00", "utc": "2037-03-30T10:23:47Z", "ms": 2122021426640.0483 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-03-31", "window": { "start": { "local": "2037-03-31T11:35:29+02:00", "utc": "2037-03-31T09:35:29Z", "ms": 2122104928669.2153 }, "end": { "local": "2037-03-31T12:23:29+02:00", "utc": "2037-03-31T10:23:29Z", "ms": 2122107808669.2153 } }, "covered_min": 18, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 15:30 on Mon 30 Mar to 11:54 on Tue 31 Mar.", "fact": "2037-03-30T13:29:49Z → 2037-03-31T09:53:35Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:36–12:24 on the 30th, 11:35–12:23 on the 31st.", "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 30th and 18 of 48 on the 31st.", "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 1087 s" }, { "step": "ruling", "text": "Caitrī Pūrṇimā, Giza, 2037: Tuesday 31 March.", "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": "2037-03-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-03-31", "confidence": "determinate" } ], "quote": "In Giza, Caitrī Pūrṇimā 2037 falls on Tuesday 31 March. Pūrṇimā runs from 15:30 on Mon 30 Mar to 11:54 on Tue 31 Mar and covers 18 of 48 minutes of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-04-03", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 12197, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-04-03T02:54:44+02:00", "utc": "2037-04-03T00:54:44Z", "ms": 2122332884210.5337 }, "end": { "local": "2037-04-04T01:06:02+02:00", "utc": "2037-04-03T23:06:02Z", "ms": 2122412761943.7085 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-03T02:54:44+02:00", "utc": "2037-04-03T00:54:44Z", "ms": 2122332884210.5337 }, "end": { "local": "2037-04-04T01:06:02+02:00", "utc": "2037-04-03T23:06:02Z", "ms": 2122412761943.7085 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-04-02", "window": { "start": { "local": "2037-04-02T20:39:00+02:00", "utc": "2037-04-02T18:39:00Z", "ms": 2122310340416.9692 }, "end": { "local": "2037-04-02T20:39:00+02:00", "utc": "2037-04-02T18:39:00Z", "ms": 2122310340416.9692 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-04-03", "window": { "start": { "local": "2037-04-03T21:42:45+02:00", "utc": "2037-04-03T19:42:45Z", "ms": 2122400564592.575 }, "end": { "local": "2037-04-03T21:42:45+02:00", "utc": "2037-04-03T19:42:45Z", "ms": 2122400564592.575 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 02:55 on Fri 3 Apr to 01:06 on Sat 4 Apr.", "fact": "2037-04-03T00:54:44Z → 2037-04-03T23:06:02Z" }, { "step": "kaala", "text": "Moonrise is at 20:39 on the 2nd and 21:43 on the 3rd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 2nd and is on the 3rd.", "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 12197 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Friday 3 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": "2037-04-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-03", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Friday 3 April. Caturthī runs from 02:55 on Fri 3 Apr to 01:06 on Sat 4 Apr and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-04-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-04-11", "festival": "ekadashi", "name": "Varūthinī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4890, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-04-10T06:55:35+02:00", "utc": "2037-04-10T04:55:35Z", "ms": 2122952135058.2783 }, "end": { "local": "2037-04-11T09:35:29+02:00", "utc": "2037-04-11T07:35:29Z", "ms": 2123048128642.569 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-10T06:55:35+02:00", "utc": "2037-04-10T04:55:35Z", "ms": 2122952135058.2783 }, "end": { "local": "2037-04-11T09:35:29+02:00", "utc": "2037-04-11T07:35:29Z", "ms": 2123048128642.569 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-04-10", "window": { "start": { "local": "2037-04-10T05:34:05+02:00", "utc": "2037-04-10T03:34:05Z", "ms": 2122947244797.0962 }, "end": { "local": "2037-04-10T05:34:05+02:00", "utc": "2037-04-10T03:34:05Z", "ms": 2122947244797.0962 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-04-11", "window": { "start": { "local": "2037-04-11T05:32:56+02:00", "utc": "2037-04-11T03:32:56Z", "ms": 2123033576494.3853 }, "end": { "local": "2037-04-11T05:32:56+02:00", "utc": "2037-04-11T03:32:56Z", "ms": 2123033576494.3853 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 06:56 on Fri 10 Apr to 09:35 on Sat 11 Apr.", "fact": "2037-04-10T04:55:35Z → 2037-04-11T07:35:29Z" }, { "step": "kaala", "text": "Sunrise is at 05:34 on the 10th and 05:33 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 4890 s" }, { "step": "ruling", "text": "Varūthinī Ekādaśī, Giza, 2037: Saturday 11 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": "2037-04-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-11", "confidence": "determinate" } ], "quote": "In Giza, Varūthinī Ekādaśī 2037 falls on Saturday 11 April. Ekādaśī runs from 06:56 on Fri 10 Apr to 09:35 on Sat 11 Apr and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-04-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-04-12", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13739, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-04-12T12:11:00+02:00", "utc": "2037-04-12T10:11:00Z", "ms": 2123143860356.1953 }, "end": { "local": "2037-04-13T14:32:03+02:00", "utc": "2037-04-13T12:32:03Z", "ms": 2123238722580.312 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-12T12:11:00+02:00", "utc": "2037-04-12T10:11:00Z", "ms": 2123143860356.1953 }, "end": { "local": "2037-04-13T14:32:03+02:00", "utc": "2037-04-13T12:32:03Z", "ms": 2123238722580.312 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-04-12", "window": { "start": { "local": "2037-04-12T18:20:25+02:00", "utc": "2037-04-12T16:20:25Z", "ms": 2123166024892.9026 }, "end": { "local": "2037-04-12T19:49:47+02:00", "utc": "2037-04-12T17:49:47Z", "ms": 2123171387099.034 } }, "covered_min": 89, "window_min": 89, "qualifies": true }, { "local_date": "2037-04-13", "window": { "start": { "local": "2037-04-13T18:21:02+02:00", "utc": "2037-04-13T16:21:02Z", "ms": 2123252461916.2678 }, "end": { "local": "2037-04-13T19:50:10+02:00", "utc": "2037-04-13T17:50:10Z", "ms": 2123257810292.204 } }, "covered_min": 0, "window_min": 89, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 12:11 on Sun 12 Apr to 14:32 on Mon 13 Apr.", "fact": "2037-04-12T10:11:00Z → 2037-04-13T12:32:03Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:20–19:50 on the 12th, 18:21–19:50 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 89 of 89 minutes on the 12th and 0 of 89 on the 13th.", "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 13739 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Sunday 12 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": "2037-04-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-12", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Sunday 12 April. Trayodaśī runs from 12:11 on Sun 12 Apr to 14:32 on Mon 13 Apr and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-04-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vaishakhi", "festival": "vaishakhi", "name": "Vaiśākhī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13695, "anga": { "type": "sankranti", "index": 0, "key": "mesha", "name": "Meṣa", "start": { "local": "2037-04-14T01:41:20+02:00", "utc": "2037-04-13T23:41:20Z", "ms": 2123278879916.7327 }, "end": { "local": "2037-05-14T23:30:54+03:00", "utc": "2037-05-14T20:30:54Z", "ms": 2125945853812.3438 } }, "span": { "of": "transit", "start": { "local": "2037-04-14T01:41:20+02:00", "utc": "2037-04-13T23:41:20Z", "ms": 2123278879916.7327 }, "end": { "local": "2037-04-14T01:41:20+02:00", "utc": "2037-04-13T23:41:20Z", "ms": 2123278879916.7327 } }, "kaala": "day", "days": [ { "local_date": "2037-04-13", "window": { "start": { "local": "2037-04-13T05:30:41+02:00", "utc": "2037-04-13T03:30:41Z", "ms": 2123206241438.8872 }, "end": { "local": "2037-04-14T05:29:35+02:00", "utc": "2037-04-14T03:29:35Z", "ms": 2123292574735.7896 } }, "covered_min": 1, "window_min": 1439, "qualifies": true }, { "local_date": "2037-04-14", "window": { "start": { "local": "2037-04-14T05:29:35+02:00", "utc": "2037-04-14T03:29:35Z", "ms": 2123292574735.7896 }, "end": { "local": "2037-04-15T05:28:29+02:00", "utc": "2037-04-15T03:28:29Z", "ms": 2123378908614.9558 } }, "covered_min": 0, "window_min": 1439, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "The Sun enters Meṣa at 01:41 on Tue 14 Apr.", "fact": "2037-04-13T23:41:20Z · nirayana, lahiri-iae1985" }, { "step": "kaala", "text": "The day runs from sunrise to the next sunrise: from 05:31 on the 13th, and from 05:30 on the 14th.", "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 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 sunrise → only-day · margin 13695 s" }, { "step": "ruling", "text": "Vaiśākhī, Giza, 2037: 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": "2037-04-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-13", "confidence": "determinate" }, { "kind": "reckoning", "id": "civil-day", "local_date": "2037-04-14", "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": "sunset-rule", "local_date": "2037-04-14", "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 Giza, Vaiśākhī 2037 falls on Monday 13 April. The Sun enters Meṣa at 01:41 on Tue 14 Apr, and the rule counts the day from sunrise. Counted from midnight, or 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 April.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/shivaratri?on=2037-04-13", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25141, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-04-13T14:32:03+02:00", "utc": "2037-04-13T12:32:03Z", "ms": 2123238722580.312 }, "end": { "local": "2037-04-14T16:32:03+02:00", "utc": "2037-04-14T14:32:03Z", "ms": 2123332322560.2368 }, "month": { "amanta": 0, "purnimanta": 1, "adhika": false, "amanta_name": "Caitra", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-13T14:32:03+02:00", "utc": "2037-04-13T12:32:03Z", "ms": 2123238722580.312 }, "end": { "local": "2037-04-14T16:32:03+02:00", "utc": "2037-04-14T14:32:03Z", "ms": 2123332322560.2368 } }, "kaala": "nishita", "days": [ { "local_date": "2037-04-13", "window": { "start": { "local": "2037-04-13T23:31:18+02:00", "utc": "2037-04-13T21:31:18Z", "ms": 2123271078326.0288 }, "end": { "local": "2037-04-14T00:19:18+02:00", "utc": "2037-04-13T22:19:18Z", "ms": 2123273958326.0288 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-04-14", "window": { "start": { "local": "2037-04-14T23:31:04+02:00", "utc": "2037-04-14T21:31:04Z", "ms": 2123357463831.4165 }, "end": { "local": "2037-04-15T00:19:04+02:00", "utc": "2037-04-14T22:19:04Z", "ms": 2123360343831.4165 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 14:32 on Mon 13 Apr to 16:32 on Tue 14 Apr.", "fact": "2037-04-13T12:32:03Z → 2037-04-14T14:32:03Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:31–00:19 on the 13th, 23:31–00:19 on the 14th.", "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 13th and 0 of 48 on the 14th.", "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 25141 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Monday 13 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": "2037-04-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-13", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Monday 13 April. Caturdaśī runs from 14:32 on Mon 13 Apr to 16:32 on Tue 14 Apr and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-04-13", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/akshaya-tritiya", "festival": "akshaya-tritiya", "name": "Akṣaya Tṛtīyā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32260, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-04-17T20:04:18+02:00", "utc": "2037-04-17T18:04:18Z", "ms": 2123604258485.023 }, "end": { "local": "2037-04-18T20:26:31+02:00", "utc": "2037-04-18T18:26:31Z", "ms": 2123691990850.0703 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-17T20:04:18+02:00", "utc": "2037-04-17T18:04:18Z", "ms": 2123604258485.023 }, "end": { "local": "2037-04-18T20:26:31+02:00", "utc": "2037-04-18T18:26:31Z", "ms": 2123691990850.0703 } }, "kaala": "purvahna", "days": [ { "local_date": "2037-04-18", "window": { "start": { "local": "2037-04-18T05:25:14+02:00", "utc": "2037-04-18T03:25:14Z", "ms": 2123637913984.0938 }, "end": { "local": "2037-04-18T09:44:52+02:00", "utc": "2037-04-18T07:44:52Z", "ms": 2123653492209.4265 } }, "covered_min": 260, "window_min": 260, "qualifies": true }, { "local_date": "2037-04-19", "window": { "start": { "local": "2037-04-19T05:24:10+02:00", "utc": "2037-04-19T03:24:10Z", "ms": 2123724250429.3767 }, "end": { "local": "2037-04-19T09:44:22+02:00", "utc": "2037-04-19T07:44:22Z", "ms": 2123739862395.4617 } }, "covered_min": 0, "window_min": 260, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 20:04 on Fri 17 Apr to 20:27 on Sat 18 Apr.", "fact": "2037-04-17T18:04:18Z → 2037-04-18T18:26:31Z" }, { "step": "kaala", "text": "Pūrvāhṇa is first 5 of 15 day muhūrtas: 05:25–09:45 on the 18th, 05:24–09:44 on the 19th.", "fact": "purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Tṛtīyā must be present during pūrvāhṇa. It covers 260 of 260 minutes on the 18th and 0 of 260 on the 19th.", "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 32260 s" }, { "step": "ruling", "text": "Akṣaya Tṛtīyā, Giza, 2037: Saturday 18 April.", "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": "2037-04-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-18", "confidence": "determinate" } ], "quote": "In Giza, Akṣaya Tṛtīyā 2037 falls on Saturday 18 April. Tṛtīyā runs from 20:04 on Fri 17 Apr to 20:27 on Sat 18 Apr and covers all of pūrvāhṇa that forenoon.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/parashurama-jayanti", "festival": "parashurama-jayanti", "name": "Paraśurāma Jayantī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 754, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-04-17T20:04:18+02:00", "utc": "2037-04-17T18:04:18Z", "ms": 2123604258485.023 }, "end": { "local": "2037-04-18T20:26:31+02:00", "utc": "2037-04-18T18:26:31Z", "ms": 2123691990850.0703 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-17T20:04:18+02:00", "utc": "2037-04-17T18:04:18Z", "ms": 2123604258485.023 }, "end": { "local": "2037-04-18T20:26:31+02:00", "utc": "2037-04-18T18:26:31Z", "ms": 2123691990850.0703 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-04-17", "window": { "start": { "local": "2037-04-17T18:23:31+02:00", "utc": "2037-04-17T16:23:31Z", "ms": 2123598211096.1345 }, "end": { "local": "2037-04-17T19:51:45+02:00", "utc": "2037-04-17T17:51:45Z", "ms": 2123603504814.529 } }, "covered_min": 0, "window_min": 88, "qualifies": false }, { "local_date": "2037-04-18", "window": { "start": { "local": "2037-04-18T18:24:09+02:00", "utc": "2037-04-18T16:24:09Z", "ms": 2123684648660.0923 }, "end": { "local": "2037-04-18T19:52:09+02:00", "utc": "2037-04-18T17:52:09Z", "ms": 2123689928895.9968 } }, "covered_min": 88, "window_min": 88, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 20:04 on Fri 17 Apr to 20:27 on Sat 18 Apr.", "fact": "2037-04-17T18:04:18Z → 2037-04-18T18:26:31Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:24–19:52 on the 17th, 18:24–19:52 on the 18th.", "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 88 minutes on the 17th and 88 of 88 on the 18th.", "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 754 s" }, { "step": "ruling", "text": "Paraśurāma Jayantī, Giza, 2037: Saturday 18 April.", "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": "2037-04-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-18", "confidence": "determinate" } ], "quote": "In Giza, Paraśurāma Jayantī 2037 falls on Saturday 18 April. Tṛtīyā runs from 20:04 on Fri 17 Apr to 20:27 on Sat 18 Apr and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-04-19", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 29219, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-04-18T20:26:31+02:00", "utc": "2037-04-18T18:26:31Z", "ms": 2123691990850.0703 }, "end": { "local": "2037-04-19T20:25:28+02:00", "utc": "2037-04-19T18:25:28Z", "ms": 2123778327520.8228 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-18T20:26:31+02:00", "utc": "2037-04-18T18:26:31Z", "ms": 2123691990850.0703 }, "end": { "local": "2037-04-19T20:25:28+02:00", "utc": "2037-04-19T18:25:28Z", "ms": 2123778327520.8228 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-18", "window": { "start": { "local": "2037-04-18T11:30:41+02:00", "utc": "2037-04-18T09:30:41Z", "ms": 2123659841322.093 }, "end": { "local": "2037-04-18T12:18:41+02:00", "utc": "2037-04-18T10:18:41Z", "ms": 2123662721322.093 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-04-19", "window": { "start": { "local": "2037-04-19T11:30:28+02:00", "utc": "2037-04-19T09:30:28Z", "ms": 2123746228378.504 }, "end": { "local": "2037-04-19T12:18:28+02:00", "utc": "2037-04-19T10:18:28Z", "ms": 2123749108378.504 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 20:27 on Sat 18 Apr to 20:25 on Sun 19 Apr.", "fact": "2037-04-18T18:26:31Z → 2037-04-19T18:25:28Z" }, { "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": "Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 18th and 48 of 48 on the 19th.", "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 29219 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Sunday 19 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": "2037-04-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-19", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Sunday 19 April. Caturthī runs from 20:27 on Sat 18 Apr to 20:25 on Sun 19 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-04-19", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shankara-jayanti", "festival": "shankara-jayanti", "name": "Śaṅkara Jayantī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 27762, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-04-19T20:25:28+02:00", "utc": "2037-04-19T18:25:28Z", "ms": 2123778327520.8228 }, "end": { "local": "2037-04-20T20:00:57+02:00", "utc": "2037-04-20T18:00:57Z", "ms": 2123863257470.711 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-19T20:25:28+02:00", "utc": "2037-04-19T18:25:28Z", "ms": 2123778327520.8228 }, "end": { "local": "2037-04-20T20:00:57+02:00", "utc": "2037-04-20T18:00:57Z", "ms": 2123863257470.711 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-19", "window": { "start": { "local": "2037-04-19T11:30:28+02:00", "utc": "2037-04-19T09:30:28Z", "ms": 2123746228378.504 }, "end": { "local": "2037-04-19T12:18:28+02:00", "utc": "2037-04-19T10:18:28Z", "ms": 2123749108378.504 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-04-20", "window": { "start": { "local": "2037-04-20T11:30:16+02:00", "utc": "2037-04-20T09:30:16Z", "ms": 2123832615835.2266 }, "end": { "local": "2037-04-20T12:18:16+02:00", "utc": "2037-04-20T10:18:16Z", "ms": 2123835495835.2266 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 20:25 on Sun 19 Apr to 20:01 on Mon 20 Apr.", "fact": "2037-04-19T18:25:28Z → 2037-04-20T18:00:57Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:30–12:18 on the 19th, 11:30–12:18 on the 20th.", "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 19th and 48 of 48 on the 20th.", "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 27762 s" }, { "step": "ruling", "text": "Śaṅkara Jayantī, Giza, 2037: Monday 20 April.", "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": "2037-04-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-20", "confidence": "determinate" } ], "quote": "In Giza, Śaṅkara Jayantī 2037 falls on Monday 20 April. Pañcamī runs from 20:25 on Sun 19 Apr to 20:01 on Mon 20 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/gangotpatti", "festival": "gangotpatti", "name": "Gaṅgotpatti", "everyday": "Ganga Saptami", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 20422, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-04-21T19:12:13+02:00", "utc": "2037-04-21T17:12:13Z", "ms": 2123946732938.9707 }, "end": { "local": "2037-04-22T17:58:14+02:00", "utc": "2037-04-22T15:58:14Z", "ms": 2124028694389.3872 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-21T19:12:13+02:00", "utc": "2037-04-21T17:12:13Z", "ms": 2123946732938.9707 }, "end": { "local": "2037-04-22T17:58:14+02:00", "utc": "2037-04-22T15:58:14Z", "ms": 2124028694389.3872 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-21", "window": { "start": { "local": "2037-04-21T11:30:04+02:00", "utc": "2037-04-21T09:30:04Z", "ms": 2123919003702.332 }, "end": { "local": "2037-04-21T12:18:04+02:00", "utc": "2037-04-21T10:18:04Z", "ms": 2123921883702.332 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-04-22", "window": { "start": { "local": "2037-04-22T11:29:52+02:00", "utc": "2037-04-22T09:29:52Z", "ms": 2124005391989.9937 }, "end": { "local": "2037-04-22T12:17:52+02:00", "utc": "2037-04-22T10:17:52Z", "ms": 2124008271989.9937 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 19:12 on Tue 21 Apr to 17:58 on Wed 22 Apr.", "fact": "2037-04-21T17:12:13Z → 2037-04-22T15:58:14Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:30–12:18 on the 21st, 11:30–12:18 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 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. 102" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 20422 s" }, { "step": "ruling", "text": "Gaṅgotpatti, Giza, 2037: Wednesday 22 April.", "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": "2037-04-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-22", "confidence": "determinate" } ], "quote": "In Giza, Gaṅgotpatti (Ganga Saptami) 2037 falls on Wednesday 22 April. Saptamī runs from 19:12 on Tue 21 Apr to 17:58 on Wed 22 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-04-26", "festival": "ekadashi", "name": "Mohinī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13234, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-04-25T12:45:10+03:00", "utc": "2037-04-25T09:45:10Z", "ms": 2124265509823.8152 }, "end": { "local": "2037-04-26T09:57:41+03:00", "utc": "2037-04-26T06:57:41Z", "ms": 2124341860775.0159 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-25T12:45:10+03:00", "utc": "2037-04-25T09:45:10Z", "ms": 2124265509823.8152 }, "end": { "local": "2037-04-26T09:57:41+03:00", "utc": "2037-04-26T06:57:41Z", "ms": 2124341860775.0159 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-04-25", "window": { "start": { "local": "2037-04-25T06:18:05+03:00", "utc": "2037-04-25T03:18:05Z", "ms": 2124242284652.8494 }, "end": { "local": "2037-04-25T06:18:05+03:00", "utc": "2037-04-25T03:18:05Z", "ms": 2124242284652.8494 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-04-26", "window": { "start": { "local": "2037-04-26T06:17:07+03:00", "utc": "2037-04-26T03:17:07Z", "ms": 2124328626515.6733 }, "end": { "local": "2037-04-26T06:17:07+03:00", "utc": "2037-04-26T03:17:07Z", "ms": 2124328626515.6733 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 12:45 on Sat 25 Apr to 09:58 on Sun 26 Apr.", "fact": "2037-04-25T09:45:10Z → 2037-04-26T06:57:41Z" }, { "step": "kaala", "text": "Sunrise is at 06:18 on the 25th and 06:17 on the 26th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 25th and is 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 13234 s" }, { "step": "ruling", "text": "Mohinī Ekādaśī, Giza, 2037: Sunday 26 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": "2037-04-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-26", "confidence": "determinate" } ], "quote": "In Giza, Mohinī Ekādaśī 2037 falls on Sunday 26 April. Ekādaśī runs from 12:45 on Sat 25 Apr to 09:58 on Sun 26 Apr and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-04-26", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/parashurama-dvadashi", "festival": "parashurama-dvadashi", "name": "Paraśurāma Dvādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9089, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-04-26T09:57:41+03:00", "utc": "2037-04-26T06:57:41Z", "ms": 2124341860775.0159 }, "end": { "local": "2037-04-27T06:56:45+03:00", "utc": "2037-04-27T03:56:45Z", "ms": 2124417405280.7632 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-26T09:57:41+03:00", "utc": "2037-04-26T06:57:41Z", "ms": 2124341860775.0159 }, "end": { "local": "2037-04-27T06:56:45+03:00", "utc": "2037-04-27T03:56:45Z", "ms": 2124417405280.7632 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-26", "window": { "start": { "local": "2037-04-26T12:29:10+03:00", "utc": "2037-04-26T09:29:10Z", "ms": 2124350949564.2466 }, "end": { "local": "2037-04-26T13:17:10+03:00", "utc": "2037-04-26T10:17:10Z", "ms": 2124353829564.2466 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-04-27", "window": { "start": { "local": "2037-04-27T12:29:00+03:00", "utc": "2037-04-27T09:29:00Z", "ms": 2124437340123.8833 }, "end": { "local": "2037-04-27T13:17:00+03:00", "utc": "2037-04-27T10:17:00Z", "ms": 2124440220123.8833 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 09:58 on Sun 26 Apr to 06:57 on Mon 27 Apr.", "fact": "2037-04-26T06:57:41Z → 2037-04-27T03:56:45Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 26th, 12:29–13:17 on the 27th.", "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 26th and 0 of 48 on the 27th.", "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 9089 s" }, { "step": "ruling", "text": "Paraśurāma Dvādaśī, Giza, 2037: Sunday 26 April.", "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": "2037-04-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-26", "confidence": "determinate" } ], "quote": "In Giza, Paraśurāma Dvādaśī 2037 falls on Sunday 26 April. Dvādaśī runs from 09:58 on Sun 26 Apr to 06:57 on Mon 27 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/rukmini-dvadashi", "festival": "rukmini-dvadashi", "name": "Rukmiṇī Dvādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9089, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-04-26T09:57:41+03:00", "utc": "2037-04-26T06:57:41Z", "ms": 2124341860775.0159 }, "end": { "local": "2037-04-27T06:56:45+03:00", "utc": "2037-04-27T03:56:45Z", "ms": 2124417405280.7632 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-26T09:57:41+03:00", "utc": "2037-04-26T06:57:41Z", "ms": 2124341860775.0159 }, "end": { "local": "2037-04-27T06:56:45+03:00", "utc": "2037-04-27T03:56:45Z", "ms": 2124417405280.7632 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-26", "window": { "start": { "local": "2037-04-26T12:29:10+03:00", "utc": "2037-04-26T09:29:10Z", "ms": 2124350949564.2466 }, "end": { "local": "2037-04-26T13:17:10+03:00", "utc": "2037-04-26T10:17:10Z", "ms": 2124353829564.2466 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-04-27", "window": { "start": { "local": "2037-04-27T12:29:00+03:00", "utc": "2037-04-27T09:29:00Z", "ms": 2124437340123.8833 }, "end": { "local": "2037-04-27T13:17:00+03:00", "utc": "2037-04-27T10:17:00Z", "ms": 2124440220123.8833 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 09:58 on Sun 26 Apr to 06:57 on Mon 27 Apr.", "fact": "2037-04-26T06:57:41Z → 2037-04-27T03:56:45Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 26th, 12:29–13:17 on the 27th.", "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 26th and 0 of 48 on the 27th.", "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 9089 s" }, { "step": "ruling", "text": "Rukmiṇī Dvādaśī, Giza, 2037: Sunday 26 April.", "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": "2037-04-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-26", "confidence": "determinate" } ], "quote": "In Giza, Rukmiṇī Dvādaśī 2037 falls on Sunday 26 April. Dvādaśī runs from 09:58 on Sun 26 Apr to 06:57 on Mon 27 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-04-27", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24836, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-04-27T06:56:45+03:00", "utc": "2037-04-27T03:56:45Z", "ms": 2124417405280.7632 }, "end": { "local": "2037-04-28T03:49:50+03:00", "utc": "2037-04-28T00:49:50Z", "ms": 2124492590373.8784 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-27T06:56:45+03:00", "utc": "2037-04-27T03:56:45Z", "ms": 2124417405280.7632 }, "end": { "local": "2037-04-28T03:49:50+03:00", "utc": "2037-04-28T00:49:50Z", "ms": 2124492590373.8784 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-04-26", "window": { "start": { "local": "2037-04-26T19:29:13+03:00", "utc": "2037-04-26T16:29:13Z", "ms": 2124376152612.82 }, "end": { "local": "2037-04-26T20:55:28+03:00", "utc": "2037-04-26T17:55:28Z", "ms": 2124381328165.2698 } }, "covered_min": 0, "window_min": 86, "qualifies": false }, { "local_date": "2037-04-27", "window": { "start": { "local": "2037-04-27T19:29:51+03:00", "utc": "2037-04-27T16:29:51Z", "ms": 2124462590991.574 }, "end": { "local": "2037-04-27T20:55:54+03:00", "utc": "2037-04-27T17:55:54Z", "ms": 2124467753912.947 } }, "covered_min": 86, "window_min": 86, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 06:57 on Mon 27 Apr to 03:50 on Tue 28 Apr.", "fact": "2037-04-27T03:56:45Z → 2037-04-28T00:49:50Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:29–20:55 on the 26th, 19:30–20:56 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 0 of 86 minutes on the 26th and 86 of 86 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 24836 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Monday 27 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": "2037-04-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-27", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Monday 27 April. Trayodaśī runs from 06:57 on Mon 27 Apr to 03:50 on Tue 28 Apr and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-04-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/nrisimha-chaturdashi", "festival": "nrisimha-chaturdashi", "name": "Nṛsiṃha Caturdaśī", "everyday": "Narasimha Jayanti", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13762, "anga": { "type": "tithi", "index": 13, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-04-28T03:49:50+03:00", "utc": "2037-04-28T00:49:50Z", "ms": 2124492590373.8784 }, "end": { "local": "2037-04-29T00:45:42+03:00", "utc": "2037-04-28T21:45:42Z", "ms": 2124567941520.5452 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-28T03:49:50+03:00", "utc": "2037-04-28T00:49:50Z", "ms": 2124492590373.8784 }, "end": { "local": "2037-04-29T00:45:42+03:00", "utc": "2037-04-28T21:45:42Z", "ms": 2124567941520.5452 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-04-27", "window": { "start": { "local": "2037-04-27T19:29:51+03:00", "utc": "2037-04-27T16:29:51Z", "ms": 2124462590991.574 }, "end": { "local": "2037-04-27T20:55:54+03:00", "utc": "2037-04-27T17:55:54Z", "ms": 2124467753912.947 } }, "covered_min": 0, "window_min": 86, "qualifies": false }, { "local_date": "2037-04-28", "window": { "start": { "local": "2037-04-28T19:30:29+03:00", "utc": "2037-04-28T16:30:29Z", "ms": 2124549029450.5588 }, "end": { "local": "2037-04-28T20:56:20+03:00", "utc": "2037-04-28T17:56:20Z", "ms": 2124554179854.5203 } }, "covered_min": 86, "window_min": 86, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 03:50 on Tue 28 Apr to 00:46 on Wed 29 Apr.", "fact": "2037-04-28T00:49:50Z → 2037-04-28T21:45:42Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:30–20:56 on the 27th, 19:30–20:56 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 0 of 86 minutes on the 27th and 86 of 86 on the 28th.", "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 13762 s" }, { "step": "ruling", "text": "Nṛsiṃha Caturdaśī, Giza, 2037: Tuesday 28 April.", "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": "2037-04-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-28", "confidence": "determinate" } ], "quote": "In Giza, Nṛsiṃha Caturdaśī (Narasimha Jayanti) 2037 falls on Tuesday 28 April. Caturdaśī runs from 03:50 on Tue 28 Apr to 00:46 on Wed 29 Apr and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/buddha-purnima", "festival": "buddha-purnima", "name": "Buddha Pūrṇimā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 31033, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-04-29T00:45:42+03:00", "utc": "2037-04-28T21:45:42Z", "ms": 2124567941520.5452 }, "end": { "local": "2037-04-29T21:53:56+03:00", "utc": "2037-04-29T18:53:56Z", "ms": 2124644036048.0005 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-29T00:45:42+03:00", "utc": "2037-04-28T21:45:42Z", "ms": 2124567941520.5452 }, "end": { "local": "2037-04-29T21:53:56+03:00", "utc": "2037-04-29T18:53:56Z", "ms": 2124644036048.0005 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-28", "window": { "start": { "local": "2037-04-28T12:28:51+03:00", "utc": "2037-04-28T09:28:51Z", "ms": 2124523731176.2153 }, "end": { "local": "2037-04-28T13:16:51+03:00", "utc": "2037-04-28T10:16:51Z", "ms": 2124526611176.2153 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-04-29", "window": { "start": { "local": "2037-04-29T12:28:43+03:00", "utc": "2037-04-29T09:28:43Z", "ms": 2124610122734.7961 }, "end": { "local": "2037-04-29T13:16:43+03:00", "utc": "2037-04-29T10:16:43Z", "ms": 2124613002734.7961 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 00:46 on Wed 29 Apr to 21:54 on Wed 29 Apr.", "fact": "2037-04-28T21:45:42Z → 2037-04-29T18:53:56Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 28th, 12:29–13:17 on the 29th.", "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 28th and 48 of 48 on the 29th.", "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 31033 s" }, { "step": "ruling", "text": "Buddha Pūrṇimā, Giza, 2037: Wednesday 29 April.", "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": "2037-04-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-29", "confidence": "determinate" } ], "quote": "In Giza, Buddha Pūrṇimā 2037 falls on Wednesday 29 April. Pūrṇimā runs from 00:46 on Wed 29 Apr to 21:54 on Wed 29 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sampat-gauri-vrata", "festival": "sampat-gauri-vrata", "name": "Sampat Gaurī Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-04-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 31033, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-04-29T00:45:42+03:00", "utc": "2037-04-28T21:45:42Z", "ms": 2124567941520.5452 }, "end": { "local": "2037-04-29T21:53:56+03:00", "utc": "2037-04-29T18:53:56Z", "ms": 2124644036048.0005 }, "month": { "amanta": 1, "purnimanta": 1, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Vaiśākha" } }, "span": { "of": "tithi", "start": { "local": "2037-04-29T00:45:42+03:00", "utc": "2037-04-28T21:45:42Z", "ms": 2124567941520.5452 }, "end": { "local": "2037-04-29T21:53:56+03:00", "utc": "2037-04-29T18:53:56Z", "ms": 2124644036048.0005 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-04-28", "window": { "start": { "local": "2037-04-28T12:28:51+03:00", "utc": "2037-04-28T09:28:51Z", "ms": 2124523731176.2153 }, "end": { "local": "2037-04-28T13:16:51+03:00", "utc": "2037-04-28T10:16:51Z", "ms": 2124526611176.2153 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-04-29", "window": { "start": { "local": "2037-04-29T12:28:43+03:00", "utc": "2037-04-29T09:28:43Z", "ms": 2124610122734.7961 }, "end": { "local": "2037-04-29T13:16:43+03:00", "utc": "2037-04-29T10:16:43Z", "ms": 2124613002734.7961 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 00:46 on Wed 29 Apr to 21:54 on Wed 29 Apr.", "fact": "2037-04-28T21:45:42Z → 2037-04-29T18:53:56Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:29–13:17 on the 28th, 12:29–13:17 on the 29th.", "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 28th and 48 of 48 on the 29th.", "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 31033 s" }, { "step": "ruling", "text": "Sampat Gaurī Vrata, Giza, 2037: Wednesday 29 April.", "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": "2037-04-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-04-29", "confidence": "determinate" } ], "quote": "In Giza, Sampat Gaurī Vrata 2037 falls on Wednesday 29 April. Pūrṇimā runs from 00:46 on Wed 29 Apr to 21:54 on Wed 29 Apr and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-05-02", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22656, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-05-02T16:09:53+03:00", "utc": "2037-05-02T13:09:53Z", "ms": 2124882593258.8943 }, "end": { "local": "2037-05-03T15:39:15+03:00", "utc": "2037-05-03T12:39:15Z", "ms": 2124967154735.6716 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-02T16:09:53+03:00", "utc": "2037-05-02T13:09:53Z", "ms": 2124882593258.8943 }, "end": { "local": "2037-05-03T15:39:15+03:00", "utc": "2037-05-03T12:39:15Z", "ms": 2124967154735.6716 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-05-02", "window": { "start": { "local": "2037-05-02T22:27:29+03:00", "utc": "2037-05-02T19:27:29Z", "ms": 2124905249426.0054 }, "end": { "local": "2037-05-02T22:27:29+03:00", "utc": "2037-05-02T19:27:29Z", "ms": 2124905249426.0054 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-05-03", "window": { "start": { "local": "2037-05-03T23:24:27+03:00", "utc": "2037-05-03T20:24:27Z", "ms": 2124995067043.4097 }, "end": { "local": "2037-05-03T23:24:27+03:00", "utc": "2037-05-03T20:24:27Z", "ms": 2124995067043.4097 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 16:10 on Sat 2 May to 15:39 on Sun 3 May.", "fact": "2037-05-02T13:09:53Z → 2037-05-03T12:39:15Z" }, { "step": "kaala", "text": "Moonrise is at 22:27 on the 2nd and 23:24 on the 3rd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 2nd and is not on the 3rd.", "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 22656 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Saturday 2 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": "2037-05-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-02", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Saturday 2 May. Caturthī runs from 16:10 on Sat 2 May to 15:39 on Sun 3 May and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-05-02", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-05-10", "festival": "ekadashi", "name": "Aparā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5916, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-05-10T02:09:03+03:00", "utc": "2037-05-09T23:09:03Z", "ms": 2125523342558.1692 }, "end": { "local": "2037-05-11T04:25:59+03:00", "utc": "2037-05-11T01:25:59Z", "ms": 2125617958577.6653 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-10T02:09:03+03:00", "utc": "2037-05-09T23:09:03Z", "ms": 2125523342558.1692 }, "end": { "local": "2037-05-11T04:25:59+03:00", "utc": "2037-05-11T01:25:59Z", "ms": 2125617958577.6653 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-05-10", "window": { "start": { "local": "2037-05-10T06:05:17+03:00", "utc": "2037-05-10T03:05:17Z", "ms": 2125537516776.3057 }, "end": { "local": "2037-05-10T06:05:17+03:00", "utc": "2037-05-10T03:05:17Z", "ms": 2125537516776.3057 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-05-11", "window": { "start": { "local": "2037-05-11T06:04:34+03:00", "utc": "2037-05-11T03:04:34Z", "ms": 2125623874482.6135 }, "end": { "local": "2037-05-11T06:04:34+03:00", "utc": "2037-05-11T03:04:34Z", "ms": 2125623874482.6135 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 02:09 on Sun 10 May to 04:26 on Mon 11 May.", "fact": "2037-05-09T23:09:03Z → 2037-05-11T01:25:59Z" }, { "step": "kaala", "text": "Sunrise is at 06:05 on the 10th and 06:05 on the 11th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 10th and is not 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 5916 s" }, { "step": "ruling", "text": "Aparā Ekādaśī, Giza, 2037: Sunday 10 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": "2037-05-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-10", "confidence": "determinate" } ], "quote": "In Giza, Aparā Ekādaśī 2037 falls on Sunday 10 May. Ekādaśī runs from 02:09 on Sun 10 May to 04:26 on Mon 11 May and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-05-10", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-05-12", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33405, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-05-12T06:18:59+03:00", "utc": "2037-05-12T03:18:59Z", "ms": 2125711139168.4514 }, "end": { "local": "2037-05-13T07:42:13+03:00", "utc": "2037-05-13T04:42:13Z", "ms": 2125802532789.56 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-12T06:18:59+03:00", "utc": "2037-05-12T03:18:59Z", "ms": 2125711139168.4514 }, "end": { "local": "2037-05-13T07:42:13+03:00", "utc": "2037-05-13T04:42:13Z", "ms": 2125802532789.56 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-05-11", "window": { "start": { "local": "2037-05-11T19:38:54+03:00", "utc": "2037-05-11T16:38:54Z", "ms": 2125672734495.1047 }, "end": { "local": "2037-05-11T21:02:14+03:00", "utc": "2037-05-11T18:02:14Z", "ms": 2125677734351.3914 } }, "covered_min": 0, "window_min": 83, "qualifies": false }, { "local_date": "2037-05-12", "window": { "start": { "local": "2037-05-12T19:39:33+03:00", "utc": "2037-05-12T16:39:33Z", "ms": 2125759173324.754 }, "end": { "local": "2037-05-12T21:02:43+03:00", "utc": "2037-05-12T18:02:43Z", "ms": 2125764162694.2866 } }, "covered_min": 83, "window_min": 83, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 06:19 on Tue 12 May to 07:42 on Wed 13 May.", "fact": "2037-05-12T03:18:59Z → 2037-05-13T04:42:13Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:39–21:02 on the 11th, 19:40–21:03 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 0 of 83 minutes on the 11th and 83 of 83 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 33405 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Tuesday 12 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": "2037-05-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-12", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Tuesday 12 May. Trayodaśī runs from 06:19 on Tue 12 May to 07:42 on Wed 13 May and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-05-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-05-13", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23209, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-05-13T07:42:13+03:00", "utc": "2037-05-13T04:42:13Z", "ms": 2125802532789.56 }, "end": { "local": "2037-05-14T08:33:41+03:00", "utc": "2037-05-14T05:33:41Z", "ms": 2125892021208.4006 }, "month": { "amanta": 1, "purnimanta": 2, "adhika": false, "amanta_name": "Vaiśākha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-13T07:42:13+03:00", "utc": "2037-05-13T04:42:13Z", "ms": 2125802532789.56 }, "end": { "local": "2037-05-14T08:33:41+03:00", "utc": "2037-05-14T05:33:41Z", "ms": 2125892021208.4006 } }, "kaala": "nishita", "days": [ { "local_date": "2037-05-12", "window": { "start": { "local": "2037-05-13T00:27:23+03:00", "utc": "2037-05-12T21:27:23Z", "ms": 2125776443460.5015 }, "end": { "local": "2037-05-13T01:15:23+03:00", "utc": "2037-05-12T22:15:23Z", "ms": 2125779323460.5015 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-05-13", "window": { "start": { "local": "2037-05-14T00:27:24+03:00", "utc": "2037-05-13T21:27:24Z", "ms": 2125862843547.5757 }, "end": { "local": "2037-05-14T01:15:24+03:00", "utc": "2037-05-13T22:15:24Z", "ms": 2125865723547.5757 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 07:42 on Wed 13 May to 08:34 on Thu 14 May.", "fact": "2037-05-13T04:42:13Z → 2037-05-14T05:33:41Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:27–01:15 on the 12th, 00:27–01:15 on the 13th.", "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 12th and 48 of 48 on the 13th.", "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 23209 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Wednesday 13 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": "2037-05-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-13", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Wednesday 13 May. Caturdaśī runs from 07:42 on Wed 13 May to 08:34 on Thu 14 May and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-05-13", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-05-18", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18287, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-05-18T07:23:02+03:00", "utc": "2037-05-18T04:23:02Z", "ms": 2126233381680.3184 }, "end": { "local": "2037-05-19T06:12:30+03:00", "utc": "2037-05-19T03:12:30Z", "ms": 2126315550413.4724 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-18T07:23:02+03:00", "utc": "2037-05-18T04:23:02Z", "ms": 2126233381680.3184 }, "end": { "local": "2037-05-19T06:12:30+03:00", "utc": "2037-05-19T03:12:30Z", "ms": 2126315550413.4724 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-05-18", "window": { "start": { "local": "2037-05-18T12:27:49+03:00", "utc": "2037-05-18T09:27:49Z", "ms": 2126251668539.2515 }, "end": { "local": "2037-05-18T13:15:49+03:00", "utc": "2037-05-18T10:15:49Z", "ms": 2126254548539.2515 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-05-19", "window": { "start": { "local": "2037-05-19T12:27:51+03:00", "utc": "2037-05-19T09:27:51Z", "ms": 2126338071309.1548 }, "end": { "local": "2037-05-19T13:15:51+03:00", "utc": "2037-05-19T10:15:51Z", "ms": 2126340951309.1548 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 07:23 on Mon 18 May to 06:13 on Tue 19 May.", "fact": "2037-05-18T04:23:02Z → 2037-05-19T03:12:30Z" }, { "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": "Caturthī 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. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 18287 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Monday 18 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": "2037-05-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-18", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Monday 18 May. Caturthī runs from 07:23 on Mon 18 May to 06:13 on Tue 19 May and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-05-18", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-05-25", "festival": "ekadashi", "name": "Śukla Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35724, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-05-24T18:21:08+03:00", "utc": "2037-05-24T15:21:08Z", "ms": 2126791268260.6074 }, "end": { "local": "2037-05-25T15:52:22+03:00", "utc": "2037-05-25T12:52:22Z", "ms": 2126868741621.5696 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-24T18:21:08+03:00", "utc": "2037-05-24T15:21:08Z", "ms": 2126791268260.6074 }, "end": { "local": "2037-05-25T15:52:22+03:00", "utc": "2037-05-25T12:52:22Z", "ms": 2126868741621.5696 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-05-24", "window": { "start": { "local": "2037-05-24T05:57:21+03:00", "utc": "2037-05-24T02:57:21Z", "ms": 2126746641274.2847 }, "end": { "local": "2037-05-24T05:57:21+03:00", "utc": "2037-05-24T02:57:21Z", "ms": 2126746641274.2847 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-05-25", "window": { "start": { "local": "2037-05-25T05:56:57+03:00", "utc": "2037-05-25T02:56:57Z", "ms": 2126833017309.1157 }, "end": { "local": "2037-05-25T05:56:57+03:00", "utc": "2037-05-25T02:56:57Z", "ms": 2126833017309.1157 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 18:21 on Sun 24 May to 15:52 on Mon 25 May.", "fact": "2037-05-24T15:21:08Z → 2037-05-25T12:52:22Z" }, { "step": "kaala", "text": "Sunrise is at 05:57 on the 24th and 05:57 on the 25th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 24th and is on the 25th.", "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 35724 s" }, { "step": "ruling", "text": "Śukla Ekādaśī, Giza, 2037: Monday 25 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": "2037-05-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-25", "confidence": "determinate" } ], "quote": "In Giza, Śukla Ekādaśī 2037 falls on Monday 25 May. Ekādaśī runs from 18:21 on Sun 24 May to 15:52 on Mon 25 May and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-05-25", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-05-26", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-05-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22972, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-05-26T13:25:23+03:00", "utc": "2037-05-26T10:25:23Z", "ms": 2126946322510.1653 }, "end": { "local": "2037-05-27T11:06:44+03:00", "utc": "2037-05-27T08:06:44Z", "ms": 2127024403830.5266 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-05-26T13:25:23+03:00", "utc": "2037-05-26T10:25:23Z", "ms": 2126946322510.1653 }, "end": { "local": "2037-05-27T11:06:44+03:00", "utc": "2037-05-27T08:06:44Z", "ms": 2127024403830.5266 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-05-26", "window": { "start": { "local": "2037-05-26T19:48:15+03:00", "utc": "2037-05-26T16:48:15Z", "ms": 2126969294709.6655 }, "end": { "local": "2037-05-26T21:09:19+03:00", "utc": "2037-05-26T18:09:19Z", "ms": 2126974158554.52 } }, "covered_min": 81, "window_min": 81, "qualifies": true }, { "local_date": "2037-05-27", "window": { "start": { "local": "2037-05-27T19:48:49+03:00", "utc": "2037-05-27T16:48:49Z", "ms": 2127055729230.8062 }, "end": { "local": "2037-05-27T21:09:46+03:00", "utc": "2037-05-27T18:09:46Z", "ms": 2127060585835.411 } }, "covered_min": 0, "window_min": 81, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 13:25 on Tue 26 May to 11:07 on Wed 27 May.", "fact": "2037-05-26T10:25:23Z → 2037-05-27T08:06:44Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:48–21:09 on the 26th, 19:49–21:10 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 81 of 81 minutes on the 26th and 0 of 81 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 22972 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Tuesday 26 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": "2037-05-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-05-26", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Tuesday 26 May. Trayodaśī runs from 13:25 on Tue 26 May to 11:07 on Wed 27 May and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-05-26", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/sankashta-chaturthi?on=2037-06-01", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 27976, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-06-01T05:52:24+03:00", "utc": "2037-06-01T02:52:24Z", "ms": 2127437544284.9214 }, "end": { "local": "2037-06-02T06:43:26+03:00", "utc": "2037-06-02T03:43:26Z", "ms": 2127527005540.9302 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-01T05:52:24+03:00", "utc": "2037-06-01T02:52:24Z", "ms": 2127437544284.9214 }, "end": { "local": "2037-06-02T06:43:26+03:00", "utc": "2037-06-02T03:43:26Z", "ms": 2127527005540.9302 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-05-31", "window": { "start": { "local": "2037-05-31T22:06:09+03:00", "utc": "2037-05-31T19:06:09Z", "ms": 2127409568590.9429 }, "end": { "local": "2037-05-31T22:06:09+03:00", "utc": "2037-05-31T19:06:09Z", "ms": 2127409568590.9429 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-06-01", "window": { "start": { "local": "2037-06-01T22:56:18+03:00", "utc": "2037-06-01T19:56:18Z", "ms": 2127498978223.7195 }, "end": { "local": "2037-06-01T22:56:18+03:00", "utc": "2037-06-01T19:56:18Z", "ms": 2127498978223.7195 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:52 on Mon 1 Jun to 06:43 on Tue 2 Jun.", "fact": "2037-06-01T02:52:24Z → 2037-06-02T03:43:26Z" }, { "step": "kaala", "text": "Moonrise is at 22:06 on the 31st and 22:56 on the 1st.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 31st and is on the 1st.", "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 27976 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Monday 1 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": "2037-06-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-01", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Monday 1 June. Caturthī runs from 05:52 on Mon 1 Jun to 06:43 on Tue 2 Jun and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-06-01", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-06-09", "festival": "ekadashi", "name": "Kṛṣṇa Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33286, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-06-08T19:15:03+03:00", "utc": "2037-06-08T16:15:03Z", "ms": 2128090503227.557 }, "end": { "local": "2037-06-09T20:38:59+03:00", "utc": "2037-06-09T17:38:59Z", "ms": 2128181939489.9663 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-08T19:15:03+03:00", "utc": "2037-06-08T16:15:03Z", "ms": 2128090503227.557 }, "end": { "local": "2037-06-09T20:38:59+03:00", "utc": "2037-06-09T17:38:59Z", "ms": 2128181939489.9663 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-06-09", "window": { "start": { "local": "2037-06-09T05:53:47+03:00", "utc": "2037-06-09T02:53:47Z", "ms": 2128128827239.1907 }, "end": { "local": "2037-06-09T05:53:47+03:00", "utc": "2037-06-09T02:53:47Z", "ms": 2128128827239.1907 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-06-10", "window": { "start": { "local": "2037-06-10T05:53:46+03:00", "utc": "2037-06-10T02:53:46Z", "ms": 2128215225871.1453 }, "end": { "local": "2037-06-10T05:53:46+03:00", "utc": "2037-06-10T02:53:46Z", "ms": 2128215225871.1453 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 19:15 on Mon 8 Jun to 20:39 on Tue 9 Jun.", "fact": "2037-06-08T16:15:03Z → 2037-06-09T17:38:59Z" }, { "step": "kaala", "text": "Sunrise is at 05:54 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 33286 s" }, { "step": "ruling", "text": "Kṛṣṇa Ekādaśī, Giza, 2037: Tuesday 9 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": "2037-06-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-09", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Ekādaśī 2037 falls on Tuesday 9 June. Ekādaśī runs from 19:15 on Mon 8 Jun to 20:39 on Tue 9 Jun and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-06-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-06-11", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 642, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-06-10T21:26:13+03:00", "utc": "2037-06-10T18:26:13Z", "ms": 2128271172940.156 }, "end": { "local": "2037-06-11T21:35:30+03:00", "utc": "2037-06-11T18:35:30Z", "ms": 2128358129884.5022 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-10T21:26:13+03:00", "utc": "2037-06-10T18:26:13Z", "ms": 2128271172940.156 }, "end": { "local": "2037-06-11T21:35:30+03:00", "utc": "2037-06-11T18:35:30Z", "ms": 2128358129884.5022 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-06-10", "window": { "start": { "local": "2037-06-10T19:55:47+03:00", "utc": "2037-06-10T16:55:47Z", "ms": 2128265746837.3667 }, "end": { "local": "2037-06-10T21:15:31+03:00", "utc": "2037-06-10T18:15:31Z", "ms": 2128270530709.0547 } }, "covered_min": 0, "window_min": 80, "qualifies": false }, { "local_date": "2037-06-11", "window": { "start": { "local": "2037-06-11T19:56:11+03:00", "utc": "2037-06-11T16:56:11Z", "ms": 2128352170760.726 }, "end": { "local": "2037-06-11T21:15:52+03:00", "utc": "2037-06-11T18:15:52Z", "ms": 2128356951623.9993 } }, "covered_min": 80, "window_min": 80, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 21:26 on Wed 10 Jun to 21:35 on Thu 11 Jun.", "fact": "2037-06-10T18:26:13Z → 2037-06-11T18:35:30Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:56–21:16 on the 10th, 19:56–21:16 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 80 minutes on the 10th and 80 of 80 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 642 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Thursday 11 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": "2037-06-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-11", "confidence": "boundary" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Thursday 11 June. Trayodaśī runs from 21:26 on Wed 10 Jun to 21:35 on Thu 11 Jun and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-06-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-06-11", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 10529, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-06-11T21:35:30+03:00", "utc": "2037-06-11T18:35:30Z", "ms": 2128358129884.5022 }, "end": { "local": "2037-06-12T21:08:49+03:00", "utc": "2037-06-12T18:08:49Z", "ms": 2128442928844.3892 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": true, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-11T21:35:30+03:00", "utc": "2037-06-11T18:35:30Z", "ms": 2128358129884.5022 }, "end": { "local": "2037-06-12T21:08:49+03:00", "utc": "2037-06-12T18:08:49Z", "ms": 2128442928844.3892 } }, "kaala": "nishita", "days": [ { "local_date": "2037-06-11", "window": { "start": { "local": "2037-06-12T00:30:59+03:00", "utc": "2037-06-11T21:30:59Z", "ms": 2128368658998.0007 }, "end": { "local": "2037-06-12T01:18:59+03:00", "utc": "2037-06-11T22:18:59Z", "ms": 2128371538998.0007 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-06-12", "window": { "start": { "local": "2037-06-13T00:31:12+03:00", "utc": "2037-06-12T21:31:12Z", "ms": 2128455071828.731 }, "end": { "local": "2037-06-13T01:19:12+03:00", "utc": "2037-06-12T22:19:12Z", "ms": 2128457951828.731 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 21:35 on Thu 11 Jun to 21:09 on Fri 12 Jun.", "fact": "2037-06-11T18:35:30Z → 2037-06-12T18:08:49Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:31–01:19 on the 11th, 00:31–01:19 on the 12th.", "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 11th and 0 of 48 on the 12th.", "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 10529 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Thursday 11 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": "2037-06-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-11", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Thursday 11 June. Caturdaśī runs from 21:35 on Thu 11 Jun to 21:09 on Fri 12 Jun and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-06-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/rambha-tritiya", "festival": "rambha-tritiya", "name": "Rambhā Tṛtīyā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5919, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-06-15T16:59:36+03:00", "utc": "2037-06-15T13:59:36Z", "ms": 2128687175645.436 }, "end": { "local": "2037-06-16T14:58:39+03:00", "utc": "2037-06-16T11:58:39Z", "ms": 2128766319194.3965 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-15T16:59:36+03:00", "utc": "2037-06-15T13:59:36Z", "ms": 2128687175645.436 }, "end": { "local": "2037-06-16T14:58:39+03:00", "utc": "2037-06-16T11:58:39Z", "ms": 2128766319194.3965 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-06-15", "window": { "start": { "local": "2037-06-15T12:31:48+03:00", "utc": "2037-06-15T09:31:48Z", "ms": 2128671107886.295 }, "end": { "local": "2037-06-15T13:19:48+03:00", "utc": "2037-06-15T10:19:48Z", "ms": 2128673987886.295 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-06-16", "window": { "start": { "local": "2037-06-16T12:32:01+03:00", "utc": "2037-06-16T09:32:01Z", "ms": 2128757520571.309 }, "end": { "local": "2037-06-16T13:20:01+03:00", "utc": "2037-06-16T10:20:01Z", "ms": 2128760400571.309 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 17:00 on Mon 15 Jun to 14:59 on Tue 16 Jun.", "fact": "2037-06-15T13:59:36Z → 2037-06-16T11:58:39Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 15th, 12:32–13:20 on the 16th.", "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 15th and 48 of 48 on the 16th.", "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 5919 s" }, { "step": "ruling", "text": "Rambhā Tṛtīyā, Giza, 2037: Tuesday 16 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": "2037-06-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-16", "confidence": "determinate" } ], "quote": "In Giza, Rambhā Tṛtīyā 2037 falls on Tuesday 16 June. Tṛtīyā runs from 17:00 on Mon 15 Jun to 14:59 on Tue 16 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-06-17", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 918, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-06-16T14:58:39+03:00", "utc": "2037-06-16T11:58:39Z", "ms": 2128766319194.3965 }, "end": { "local": "2037-06-17T12:47:32+03:00", "utc": "2037-06-17T09:47:32Z", "ms": 2128844851581.9788 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-16T14:58:39+03:00", "utc": "2037-06-16T11:58:39Z", "ms": 2128766319194.3965 }, "end": { "local": "2037-06-17T12:47:32+03:00", "utc": "2037-06-17T09:47:32Z", "ms": 2128844851581.9788 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-06-16", "window": { "start": { "local": "2037-06-16T12:32:01+03:00", "utc": "2037-06-16T09:32:01Z", "ms": 2128757520571.309 }, "end": { "local": "2037-06-16T13:20:01+03:00", "utc": "2037-06-16T10:20:01Z", "ms": 2128760400571.309 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-06-17", "window": { "start": { "local": "2037-06-17T12:32:13+03:00", "utc": "2037-06-17T09:32:13Z", "ms": 2128843933317.529 }, "end": { "local": "2037-06-17T13:20:13+03:00", "utc": "2037-06-17T10:20:13Z", "ms": 2128846813317.529 } }, "covered_min": 15, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 14:59 on Tue 16 Jun to 12:48 on Wed 17 Jun.", "fact": "2037-06-16T11:58:39Z → 2037-06-17T09:47:32Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 16th, 12:32–13:20 on the 17th.", "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 16th and 15 of 48 on the 17th.", "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 918 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Wednesday 17 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": "2037-06-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-17", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Wednesday 17 June. Caturthī runs from 14:59 on Tue 16 Jun to 12:48 on Wed 17 Jun and covers 15 of 48 minutes of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-06-17", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/aranya-gauri-vrata", "festival": "aranya-gauri-vrata", "name": "Araṇya Gaurī Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7313, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-06-18T10:30:33+03:00", "utc": "2037-06-18T07:30:33Z", "ms": 2128923033089.7705 }, "end": { "local": "2037-06-19T08:11:24+03:00", "utc": "2037-06-19T05:11:24Z", "ms": 2129001083926.7236 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-18T10:30:33+03:00", "utc": "2037-06-18T07:30:33Z", "ms": 2128923033089.7705 }, "end": { "local": "2037-06-19T08:11:24+03:00", "utc": "2037-06-19T05:11:24Z", "ms": 2129001083926.7236 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-06-18", "window": { "start": { "local": "2037-06-18T12:32:26+03:00", "utc": "2037-06-18T09:32:26Z", "ms": 2128930346097.6655 }, "end": { "local": "2037-06-18T13:20:26+03:00", "utc": "2037-06-18T10:20:26Z", "ms": 2128933226097.6655 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-06-19", "window": { "start": { "local": "2037-06-19T12:32:39+03:00", "utc": "2037-06-19T09:32:39Z", "ms": 2129016758885.3103 }, "end": { "local": "2037-06-19T13:20:39+03:00", "utc": "2037-06-19T10:20:39Z", "ms": 2129019638885.3103 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 10:31 on Thu 18 Jun to 08:11 on Fri 19 Jun.", "fact": "2037-06-18T07:30:33Z → 2037-06-19T05:11:24Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 18th, 12:33–13:21 on the 19th.", "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 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 7313 s" }, { "step": "ruling", "text": "Araṇya Gaurī Vrata, Giza, 2037: Thursday 18 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": "2037-06-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-18", "confidence": "determinate" } ], "quote": "In Giza, Araṇya Gaurī Vrata 2037 falls on Thursday 18 June. Ṣaṣṭhī runs from 10:31 on Thu 18 Jun to 08:11 on Fri 19 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/skanda-shashthi-jyaishtha", "festival": "skanda-shashthi-jyaishtha", "name": "Skanda Ṣaṣṭhī (Jyaiṣṭha)", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7313, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-06-18T10:30:33+03:00", "utc": "2037-06-18T07:30:33Z", "ms": 2128923033089.7705 }, "end": { "local": "2037-06-19T08:11:24+03:00", "utc": "2037-06-19T05:11:24Z", "ms": 2129001083926.7236 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-18T10:30:33+03:00", "utc": "2037-06-18T07:30:33Z", "ms": 2128923033089.7705 }, "end": { "local": "2037-06-19T08:11:24+03:00", "utc": "2037-06-19T05:11:24Z", "ms": 2129001083926.7236 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-06-18", "window": { "start": { "local": "2037-06-18T12:32:26+03:00", "utc": "2037-06-18T09:32:26Z", "ms": 2128930346097.6655 }, "end": { "local": "2037-06-18T13:20:26+03:00", "utc": "2037-06-18T10:20:26Z", "ms": 2128933226097.6655 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-06-19", "window": { "start": { "local": "2037-06-19T12:32:39+03:00", "utc": "2037-06-19T09:32:39Z", "ms": 2129016758885.3103 }, "end": { "local": "2037-06-19T13:20:39+03:00", "utc": "2037-06-19T10:20:39Z", "ms": 2129019638885.3103 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 10:31 on Thu 18 Jun to 08:11 on Fri 19 Jun.", "fact": "2037-06-18T07:30:33Z → 2037-06-19T05:11:24Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 18th, 12:33–13:21 on the 19th.", "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 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: purvaviddha → only-day · margin 7313 s" }, { "step": "ruling", "text": "Skanda Ṣaṣṭhī (Jyaiṣṭha), Giza, 2037: Thursday 18 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": "2037-06-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-18", "confidence": "determinate" } ], "quote": "In Giza, Skanda Ṣaṣṭhī (Jyaiṣṭha) 2037 falls on Thursday 18 June. Ṣaṣṭhī runs from 10:31 on Thu 18 Jun to 08:11 on Fri 19 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-06-23", "festival": "ekadashi", "name": "Nirjalā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22939, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-06-22T23:33:07+03:00", "utc": "2037-06-22T20:33:07Z", "ms": 2129315587116.06 }, "end": { "local": "2037-06-23T21:48:13+03:00", "utc": "2037-06-23T18:48:13Z", "ms": 2129395692585.5225 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-22T23:33:07+03:00", "utc": "2037-06-22T20:33:07Z", "ms": 2129315587116.06 }, "end": { "local": "2037-06-23T21:48:13+03:00", "utc": "2037-06-23T18:48:13Z", "ms": 2129395692585.5225 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-06-23", "window": { "start": { "local": "2037-06-23T05:55:26+03:00", "utc": "2037-06-23T02:55:26Z", "ms": 2129338525768.0894 }, "end": { "local": "2037-06-23T05:55:26+03:00", "utc": "2037-06-23T02:55:26Z", "ms": 2129338525768.0894 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-06-24", "window": { "start": { "local": "2037-06-24T05:55:42+03:00", "utc": "2037-06-24T02:55:42Z", "ms": 2129424941723.675 }, "end": { "local": "2037-06-24T05:55:42+03:00", "utc": "2037-06-24T02:55:42Z", "ms": 2129424941723.675 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 23:33 on Mon 22 Jun to 21:48 on Tue 23 Jun.", "fact": "2037-06-22T20:33:07Z → 2037-06-23T18:48:13Z" }, { "step": "kaala", "text": "Sunrise is at 05:55 on the 23rd and 05:56 on the 24th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is 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": "Only one sunrise qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 22939 s" }, { "step": "ruling", "text": "Nirjalā Ekādaśī, Giza, 2037: Tuesday 23 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": "2037-06-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-23", "confidence": "determinate" } ], "quote": "In Giza, Nirjalā Ekādaśī 2037 falls on Tuesday 23 June. Ekādaśī runs from 23:33 on Mon 22 Jun to 21:48 on Tue 23 Jun and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-06-23", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shri-rama-dvadashi", "festival": "shri-rama-dvadashi", "name": "Śrī Rāma Dvādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25114, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-06-23T21:48:13+03:00", "utc": "2037-06-23T18:48:13Z", "ms": 2129395692585.5225 }, "end": { "local": "2037-06-24T20:20:16+03:00", "utc": "2037-06-24T17:20:16Z", "ms": 2129476815907.4797 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-23T21:48:13+03:00", "utc": "2037-06-23T18:48:13Z", "ms": 2129395692585.5225 }, "end": { "local": "2037-06-24T20:20:16+03:00", "utc": "2037-06-24T17:20:16Z", "ms": 2129476815907.4797 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-06-23", "window": { "start": { "local": "2037-06-23T12:33:30+03:00", "utc": "2037-06-23T09:33:30Z", "ms": 2129362409627.5977 }, "end": { "local": "2037-06-23T13:21:30+03:00", "utc": "2037-06-23T10:21:30Z", "ms": 2129365289627.5977 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-06-24", "window": { "start": { "local": "2037-06-24T12:33:42+03:00", "utc": "2037-06-24T09:33:42Z", "ms": 2129448822101.18 }, "end": { "local": "2037-06-24T13:21:42+03:00", "utc": "2037-06-24T10:21:42Z", "ms": 2129451702101.18 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 21:48 on Tue 23 Jun to 20:20 on Wed 24 Jun.", "fact": "2037-06-23T18:48:13Z → 2037-06-24T17:20:16Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:33–13:21 on the 23rd, 12:34–13:22 on the 24th.", "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 23rd and 48 of 48 on the 24th.", "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 25114 s" }, { "step": "ruling", "text": "Śrī Rāma Dvādaśī, Giza, 2037: Wednesday 24 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": "2037-06-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-24", "confidence": "determinate" } ], "quote": "In Giza, Śrī Rāma Dvādaśī 2037 falls on Wednesday 24 June. Dvādaśī runs from 21:48 on Tue 23 Jun to 20:20 on Wed 24 Jun and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-06-24", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1233, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-06-24T20:20:16+03:00", "utc": "2037-06-24T17:20:16Z", "ms": 2129476815907.4797 }, "end": { "local": "2037-06-25T19:13:28+03:00", "utc": "2037-06-25T16:13:28Z", "ms": 2129559208057.914 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-24T20:20:16+03:00", "utc": "2037-06-24T17:20:16Z", "ms": 2129476815907.4797 }, "end": { "local": "2037-06-25T19:13:28+03:00", "utc": "2037-06-25T16:13:28Z", "ms": 2129559208057.914 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-06-24", "window": { "start": { "local": "2037-06-24T19:59:42+03:00", "utc": "2037-06-24T16:59:42Z", "ms": 2129475582478.6848 }, "end": { "local": "2037-06-24T21:19:13+03:00", "utc": "2037-06-24T18:19:13Z", "ms": 2129480352647.3545 } }, "covered_min": 59, "window_min": 80, "qualifies": true }, { "local_date": "2037-06-25", "window": { "start": { "local": "2037-06-25T19:59:50+03:00", "utc": "2037-06-25T16:59:50Z", "ms": 2129561990155.4458 }, "end": { "local": "2037-06-25T21:19:22+03:00", "utc": "2037-06-25T18:19:22Z", "ms": 2129566761708.624 } }, "covered_min": 0, "window_min": 80, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 20:20 on Wed 24 Jun to 19:13 on Thu 25 Jun.", "fact": "2037-06-24T17:20:16Z → 2037-06-25T16:13:28Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 20:00–21:19 on the 24th, 20:00–21:19 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 59 of 80 minutes on the 24th and 0 of 80 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 1233 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Wednesday 24 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": "2037-06-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-24", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Wednesday 24 June. Trayodaśī runs from 20:20 on Wed 24 Jun to 19:13 on Thu 25 Jun and covers 59 of 80 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-06-24", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vata-savitri-vrata", "festival": "vata-savitri-vrata", "name": "Vaṭa Sāvitrī Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5272, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-06-26T18:32:04+03:00", "utc": "2037-06-26T15:32:04Z", "ms": 2129643124416.8057 }, "end": { "local": "2037-06-27T18:19:59+03:00", "utc": "2037-06-27T15:19:59Z", "ms": 2129728799178.3853 }, "month": { "amanta": 2, "purnimanta": 2, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Jyeṣṭha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-26T18:32:04+03:00", "utc": "2037-06-26T15:32:04Z", "ms": 2129643124416.8057 }, "end": { "local": "2037-06-27T18:19:59+03:00", "utc": "2037-06-27T15:19:59Z", "ms": 2129728799178.3853 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-06-26", "window": { "start": { "local": "2037-06-26T19:59:57+03:00", "utc": "2037-06-26T16:59:57Z", "ms": 2129648396503.3774 }, "end": { "local": "2037-06-26T21:19:30+03:00", "utc": "2037-06-26T18:19:30Z", "ms": 2129653169753.7515 } }, "covered_min": 80, "window_min": 80, "qualifies": true }, { "local_date": "2037-06-27", "window": { "start": { "local": "2037-06-27T20:00:02+03:00", "utc": "2037-06-27T17:00:02Z", "ms": 2129734801509.5488 }, "end": { "local": "2037-06-27T21:19:37+03:00", "utc": "2037-06-27T18:19:37Z", "ms": 2129739576768.2458 } }, "covered_min": 0, "window_min": 80, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 18:32 on Fri 26 Jun to 18:20 on Sat 27 Jun.", "fact": "2037-06-26T15:32:04Z → 2037-06-27T15:19:59Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 20:00–21:19 on the 26th, 20:00–21:20 on the 27th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during pradoṣa. It covers 80 of 80 minutes on the 26th and 0 of 80 on the 27th.", "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 5272 s" }, { "step": "ruling", "text": "Vaṭa Sāvitrī Vrata, Giza, 2037: Friday 26 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": "2037-06-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-26", "confidence": "determinate" } ], "quote": "In Giza, Vaṭa Sāvitrī Vrata 2037 falls on Friday 26 June. Pūrṇimā runs from 18:32 on Fri 26 Jun to 18:20 on Sat 27 Jun and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-06-30", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-06-30", "confidence": "boundary", "boundary_reasons": [ "margin" ], "boundary_margin_s": 109, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-06-30T21:00:04+03:00", "utc": "2037-06-30T18:00:04Z", "ms": 2129997603742.042 }, "end": { "local": "2037-07-01T22:54:23+03:00", "utc": "2037-07-01T19:54:23Z", "ms": 2130090863103.2776 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-06-30T21:00:04+03:00", "utc": "2037-06-30T18:00:04Z", "ms": 2129997603742.042 }, "end": { "local": "2037-07-01T22:54:23+03:00", "utc": "2037-07-01T19:54:23Z", "ms": 2130090863103.2776 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-06-30", "window": { "start": { "local": "2037-06-30T22:17:55+03:00", "utc": "2037-06-30T19:17:55Z", "ms": 2130002275143.952 }, "end": { "local": "2037-06-30T22:17:55+03:00", "utc": "2037-06-30T19:17:55Z", "ms": 2130002275143.952 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-07-01", "window": { "start": { "local": "2037-07-01T22:56:12+03:00", "utc": "2037-07-01T19:56:12Z", "ms": 2130090972014.0596 }, "end": { "local": "2037-07-01T22:56:12+03:00", "utc": "2037-07-01T19:56:12Z", "ms": 2130090972014.0596 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 21:00 on Tue 30 Jun to 22:54 on Wed 1 Jul.", "fact": "2037-06-30T18:00:04Z → 2037-07-01T19:54:23Z" }, { "step": "kaala", "text": "Moonrise is at 22:18 on the 30th and 22:56 on the 1st.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 30th and is not on the 1st.", "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 109 s < 300 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Tuesday 30 June.", "fact": "confidence: boundary (margin)" } ], "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": "2037-06-30", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-06-30", "confidence": "boundary" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Tuesday 30 June. Caturthī runs from 21:00 on Tue 30 Jun to 22:54 on Wed 1 Jul and is current at moonrise that day. It is 1 min 49 s from a threshold: treat the date as contested.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-06-30", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-07-09", "festival": "ekadashi", "name": "Yoginī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16567, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-07-08T10:37:12+03:00", "utc": "2037-07-08T07:37:12Z", "ms": 2130651432022.715 }, "end": { "local": "2037-07-09T10:55:20+03:00", "utc": "2037-07-09T07:55:20Z", "ms": 2130738920325.9382 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-08T10:37:12+03:00", "utc": "2037-07-08T07:37:12Z", "ms": 2130651432022.715 }, "end": { "local": "2037-07-09T10:55:20+03:00", "utc": "2037-07-09T07:55:20Z", "ms": 2130738920325.9382 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-07-08", "window": { "start": { "local": "2037-07-08T06:01:05+03:00", "utc": "2037-07-08T03:01:05Z", "ms": 2130634865267.9045 }, "end": { "local": "2037-07-08T06:01:05+03:00", "utc": "2037-07-08T03:01:05Z", "ms": 2130634865267.9045 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-07-09", "window": { "start": { "local": "2037-07-09T06:01:34+03:00", "utc": "2037-07-09T03:01:34Z", "ms": 2130721294416.138 }, "end": { "local": "2037-07-09T06:01:34+03:00", "utc": "2037-07-09T03:01:34Z", "ms": 2130721294416.138 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 10:37 on Wed 8 Jul to 10:55 on Thu 9 Jul.", "fact": "2037-07-08T07:37:12Z → 2037-07-09T07:55:20Z" }, { "step": "kaala", "text": "Sunrise is at 06:01 on the 8th and 06:02 on the 9th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 8th and is on the 9th.", "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 16567 s" }, { "step": "ruling", "text": "Yoginī Ekādaśī, Giza, 2037: Thursday 9 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": "2037-07-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-09", "confidence": "determinate" } ], "quote": "In Giza, Yoginī Ekādaśī 2037 falls on Thursday 9 July. Ekādaśī runs from 10:37 on Wed 8 Jul to 10:55 on Thu 9 Jul and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-07-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-07-10", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34110, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-07-10T10:30:30+03:00", "utc": "2037-07-10T07:30:30Z", "ms": 2130823830065.001 }, "end": { "local": "2037-07-11T09:24:54+03:00", "utc": "2037-07-11T06:24:54Z", "ms": 2130906293772.0479 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-10T10:30:30+03:00", "utc": "2037-07-10T07:30:30Z", "ms": 2130823830065.001 }, "end": { "local": "2037-07-11T09:24:54+03:00", "utc": "2037-07-11T06:24:54Z", "ms": 2130906293772.0479 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-07-10", "window": { "start": { "local": "2037-07-10T19:59:00+03:00", "utc": "2037-07-10T16:59:00Z", "ms": 2130857939927.3628 }, "end": { "local": "2037-07-10T21:19:29+03:00", "utc": "2037-07-10T18:19:29Z", "ms": 2130862768549.6484 } }, "covered_min": 80, "window_min": 80, "qualifies": true }, { "local_date": "2037-07-11", "window": { "start": { "local": "2037-07-11T19:58:45+03:00", "utc": "2037-07-11T16:58:45Z", "ms": 2130944325193.3416 }, "end": { "local": "2037-07-11T21:19:20+03:00", "utc": "2037-07-11T18:19:20Z", "ms": 2130949159908.1265 } }, "covered_min": 0, "window_min": 81, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 10:31 on Fri 10 Jul to 09:25 on Sat 11 Jul.", "fact": "2037-07-10T07:30:30Z → 2037-07-11T06:24:54Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:59–21:19 on the 10th, 19:59–21:19 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 80 of 80 minutes on the 10th and 0 of 81 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 34110 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Friday 10 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": "2037-07-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-10", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Friday 10 July. Trayodaśī runs from 10:31 on Fri 10 Jul to 09:25 on Sat 11 Jul and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-07-10", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-07-11", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22698, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-07-11T09:24:54+03:00", "utc": "2037-07-11T06:24:54Z", "ms": 2130906293772.0479 }, "end": { "local": "2037-07-12T07:43:14+03:00", "utc": "2037-07-12T04:43:14Z", "ms": 2130986593662.463 }, "month": { "amanta": 2, "purnimanta": 3, "adhika": false, "amanta_name": "Jyeṣṭha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-11T09:24:54+03:00", "utc": "2037-07-11T06:24:54Z", "ms": 2130906293772.0479 }, "end": { "local": "2037-07-12T07:43:14+03:00", "utc": "2037-07-12T04:43:14Z", "ms": 2130986593662.463 } }, "kaala": "nishita", "days": [ { "local_date": "2037-07-10", "window": { "start": { "local": "2037-07-11T00:36:47+03:00", "utc": "2037-07-10T21:36:47Z", "ms": 2130874607260.9343 }, "end": { "local": "2037-07-11T01:24:47+03:00", "utc": "2037-07-10T22:24:47Z", "ms": 2130877487260.9343 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-07-11", "window": { "start": { "local": "2037-07-12T00:36:55+03:00", "utc": "2037-07-11T21:36:55Z", "ms": 2130961015373.7854 }, "end": { "local": "2037-07-12T01:24:55+03:00", "utc": "2037-07-11T22:24:55Z", "ms": 2130963895373.7854 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 09:25 on Sat 11 Jul to 07:43 on Sun 12 Jul.", "fact": "2037-07-11T06:24:54Z → 2037-07-12T04:43:14Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:37–01:25 on the 10th, 00:37–01:25 on the 11th.", "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 10th and 48 of 48 on the 11th.", "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 22698 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Saturday 11 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": "2037-07-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-11", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Saturday 11 July. Caturdaśī runs from 09:25 on Sat 11 Jul to 07:43 on Sun 12 Jul and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-07-11", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/rathayatra", "festival": "rathayatra", "name": "Rathayātrā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34738, "anga": { "type": "tithi", "index": 1, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "2037-07-14T02:58:03+03:00", "utc": "2037-07-13T23:58:03Z", "ms": 2131142282859.9478 }, "end": { "local": "2037-07-15T00:09:28+03:00", "utc": "2037-07-14T21:09:28Z", "ms": 2131218567566.3926 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-14T02:58:03+03:00", "utc": "2037-07-13T23:58:03Z", "ms": 2131142282859.9478 }, "end": { "local": "2037-07-15T00:09:28+03:00", "utc": "2037-07-14T21:09:28Z", "ms": 2131218567566.3926 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-07-14", "window": { "start": { "local": "2037-07-14T12:37:01+03:00", "utc": "2037-07-14T09:37:01Z", "ms": 2131177020649.8223 }, "end": { "local": "2037-07-14T13:25:01+03:00", "utc": "2037-07-14T10:25:01Z", "ms": 2131179900649.8223 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-07-15", "window": { "start": { "local": "2037-07-15T12:37:07+03:00", "utc": "2037-07-15T09:37:07Z", "ms": 2131263426593.1694 }, "end": { "local": "2037-07-15T13:25:07+03:00", "utc": "2037-07-15T10:25:07Z", "ms": 2131266306593.1694 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 02:58 on Tue 14 Jul to 00:09 on Wed 15 Jul.", "fact": "2037-07-13T23:58:03Z → 2037-07-14T21:09:28Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 14th, 12:37–13:25 on the 15th.", "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 14th and 0 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: paraviddha → only-day · margin 34738 s" }, { "step": "ruling", "text": "Rathayātrā, Giza, 2037: Tuesday 14 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": "2037-07-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-14", "confidence": "determinate" } ], "quote": "In Giza, Rathayātrā 2037 falls on Tuesday 14 July. Dvitīyā runs from 02:58 on Tue 14 Jul to 00:09 on Wed 15 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-07-16", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17562, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-07-15T21:13:40+03:00", "utc": "2037-07-15T18:13:40Z", "ms": 2131294420281.2258 }, "end": { "local": "2037-07-16T18:17:54+03:00", "utc": "2037-07-16T15:17:54Z", "ms": 2131370274214.6516 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-15T21:13:40+03:00", "utc": "2037-07-15T18:13:40Z", "ms": 2131294420281.2258 }, "end": { "local": "2037-07-16T18:17:54+03:00", "utc": "2037-07-16T15:17:54Z", "ms": 2131370274214.6516 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-07-15", "window": { "start": { "local": "2037-07-15T12:37:07+03:00", "utc": "2037-07-15T09:37:07Z", "ms": 2131263426593.1694 }, "end": { "local": "2037-07-15T13:25:07+03:00", "utc": "2037-07-15T10:25:07Z", "ms": 2131266306593.1694 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-07-16", "window": { "start": { "local": "2037-07-16T12:37:12+03:00", "utc": "2037-07-16T09:37:12Z", "ms": 2131349832018.0383 }, "end": { "local": "2037-07-16T13:25:12+03:00", "utc": "2037-07-16T10:25:12Z", "ms": 2131352712018.0383 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 21:14 on Wed 15 Jul to 18:18 on Thu 16 Jul.", "fact": "2037-07-15T18:13:40Z → 2037-07-16T15:17:54Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 15th, 12:37–13:25 on the 16th.", "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 15th and 48 of 48 on the 16th.", "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 17562 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Thursday 16 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": "2037-07-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-16", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Thursday 16 July. Caturthī runs from 21:14 on Wed 15 Jul to 18:18 on Thu 16 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-07-16", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/skanda-panchami", "festival": "skanda-panchami", "name": "Skanda Pañcamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7410, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-07-16T18:17:54+03:00", "utc": "2037-07-16T15:17:54Z", "ms": 2131370274214.6516 }, "end": { "local": "2037-07-17T15:28:47+03:00", "utc": "2037-07-17T12:28:47Z", "ms": 2131446526713.7024 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-16T18:17:54+03:00", "utc": "2037-07-16T15:17:54Z", "ms": 2131370274214.6516 }, "end": { "local": "2037-07-17T15:28:47+03:00", "utc": "2037-07-17T12:28:47Z", "ms": 2131446526713.7024 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-07-16", "window": { "start": { "local": "2037-07-16T12:37:12+03:00", "utc": "2037-07-16T09:37:12Z", "ms": 2131349832018.0383 }, "end": { "local": "2037-07-16T13:25:12+03:00", "utc": "2037-07-16T10:25:12Z", "ms": 2131352712018.0383 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-07-17", "window": { "start": { "local": "2037-07-17T12:37:17+03:00", "utc": "2037-07-17T09:37:17Z", "ms": 2131436236908.1907 }, "end": { "local": "2037-07-17T13:25:17+03:00", "utc": "2037-07-17T10:25:17Z", "ms": 2131439116908.1907 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 18:18 on Thu 16 Jul to 15:29 on Fri 17 Jul.", "fact": "2037-07-16T15:17:54Z → 2037-07-17T12:28:47Z" }, { "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": "Pañcamī must be present during madhyāhna. It covers 0 of 48 minutes on the 16th and 48 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 7410 s" }, { "step": "ruling", "text": "Skanda Pañcamī, Giza, 2037: Friday 17 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": "2037-07-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-17", "confidence": "determinate" } ], "quote": "In Giza, Skanda Pañcamī 2037 falls on Friday 17 July. Pañcamī runs from 18:18 on Thu 16 Jul to 15:29 on Fri 17 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vivasvat-saptami", "festival": "vivasvat-saptami", "name": "Vivasvat Saptamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 887, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-07-18T12:52:08+03:00", "utc": "2037-07-18T09:52:08Z", "ms": 2131523528421.6797 }, "end": { "local": "2037-07-19T10:32:55+03:00", "utc": "2037-07-19T07:32:55Z", "ms": 2131601575252.0872 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-18T12:52:08+03:00", "utc": "2037-07-18T09:52:08Z", "ms": 2131523528421.6797 }, "end": { "local": "2037-07-19T10:32:55+03:00", "utc": "2037-07-19T07:32:55Z", "ms": 2131601575252.0872 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-07-18", "window": { "start": { "local": "2037-07-18T12:37:21+03:00", "utc": "2037-07-18T09:37:21Z", "ms": 2131522641249.4631 }, "end": { "local": "2037-07-18T13:25:21+03:00", "utc": "2037-07-18T10:25:21Z", "ms": 2131525521249.4631 } }, "covered_min": 33, "window_min": 48, "qualifies": true }, { "local_date": "2037-07-19", "window": { "start": { "local": "2037-07-19T12:37:25+03:00", "utc": "2037-07-19T09:37:25Z", "ms": 2131609045029.8835 }, "end": { "local": "2037-07-19T13:25:25+03:00", "utc": "2037-07-19T10:25:25Z", "ms": 2131611925029.8835 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 12:52 on Sat 18 Jul to 10:33 on Sun 19 Jul.", "fact": "2037-07-18T09:52:08Z → 2037-07-19T07:32:55Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 18th, 12:37–13:25 on the 19th.", "fact": "madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Saptamī must be present during madhyāhna. It covers 33 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: purvaviddha → only-day · margin 887 s" }, { "step": "ruling", "text": "Vivasvat Saptamī, Giza, 2037: Saturday 18 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": "2037-07-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-18", "confidence": "determinate" } ], "quote": "In Giza, Vivasvat Saptamī 2037 falls on Saturday 18 July. Saptamī runs from 12:52 on Sat 18 Jul to 10:33 on Sun 19 Jul and covers 33 of 48 minutes of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-07-22", "festival": "ekadashi", "name": "Hariśayanī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 863, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-07-22T05:54:16+03:00", "utc": "2037-07-22T02:54:16Z", "ms": 2131844055928.3923 }, "end": { "local": "2037-07-23T05:14:33+03:00", "utc": "2037-07-23T02:14:33Z", "ms": 2131928073483.6353 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-22T05:54:16+03:00", "utc": "2037-07-22T02:54:16Z", "ms": 2131844055928.3923 }, "end": { "local": "2037-07-23T05:14:33+03:00", "utc": "2037-07-23T02:14:33Z", "ms": 2131928073483.6353 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-07-22", "window": { "start": { "local": "2037-07-22T06:08:39+03:00", "utc": "2037-07-22T03:08:39Z", "ms": 2131844918638.035 }, "end": { "local": "2037-07-22T06:08:39+03:00", "utc": "2037-07-22T03:08:39Z", "ms": 2131844918638.035 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-07-23", "window": { "start": { "local": "2037-07-23T06:09:14+03:00", "utc": "2037-07-23T03:09:14Z", "ms": 2131931353600.5222 }, "end": { "local": "2037-07-23T06:09:14+03:00", "utc": "2037-07-23T03:09:14Z", "ms": 2131931353600.5222 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 05:54 on Wed 22 Jul to 05:15 on Thu 23 Jul.", "fact": "2037-07-22T02:54:16Z → 2037-07-23T02:14:33Z" }, { "step": "kaala", "text": "Sunrise is at 06:09 on the 22nd and 06:09 on the 23rd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 22nd and is not 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 863 s" }, { "step": "ruling", "text": "Hariśayanī Ekādaśī, Giza, 2037: Wednesday 22 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": "2037-07-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-22", "confidence": "determinate" } ], "quote": "In Giza, Hariśayanī Ekādaśī 2037 falls on Wednesday 22 July. Ekādaśī runs from 05:54 on Wed 22 Jul to 05:15 on Thu 23 Jul and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-07-22", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-07-24", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-24", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28016, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-07-24T05:02:58+03:00", "utc": "2037-07-24T02:02:58Z", "ms": 2132013777934.1511 }, "end": { "local": "2037-07-25T05:19:34+03:00", "utc": "2037-07-25T02:19:34Z", "ms": 2132101174001.1782 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-24T05:02:58+03:00", "utc": "2037-07-24T02:02:58Z", "ms": 2132013777934.1511 }, "end": { "local": "2037-07-25T05:19:34+03:00", "utc": "2037-07-25T02:19:34Z", "ms": 2132101174001.1782 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-07-23", "window": { "start": { "local": "2037-07-23T19:53:55+03:00", "utc": "2037-07-23T16:53:55Z", "ms": 2131980835147.2512 }, "end": { "local": "2037-07-23T21:16:02+03:00", "utc": "2037-07-23T18:16:02Z", "ms": 2131985762295.3494 } }, "covered_min": 0, "window_min": 82, "qualifies": false }, { "local_date": "2037-07-24", "window": { "start": { "local": "2037-07-24T19:53:22+03:00", "utc": "2037-07-24T16:53:22Z", "ms": 2132067201718.037 }, "end": { "local": "2037-07-24T21:15:38+03:00", "utc": "2037-07-24T18:15:38Z", "ms": 2132072138034.144 } }, "covered_min": 82, "window_min": 82, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 05:03 on Fri 24 Jul to 05:20 on Sat 25 Jul.", "fact": "2037-07-24T02:02:58Z → 2037-07-25T02:19:34Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:54–21:16 on the 23rd, 19:53–21:16 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 0 of 82 minutes on the 23rd and 82 of 82 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 28016 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Friday 24 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": "2037-07-24", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-24", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Friday 24 July. Trayodaśī runs from 05:03 on Fri 24 Jul to 05:20 on Sat 25 Jul and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-07-24", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vyasa-puja", "festival": "vyasa-puja", "name": "Vyāsa Pūjā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 421, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 } }, "kaala": "udaya-3", "days": [ { "local_date": "2037-07-26", "window": { "start": { "local": "2037-07-26T06:11:00+03:00", "utc": "2037-07-26T03:11:00Z", "ms": 2132190659572.7126 }, "end": { "local": "2037-07-26T08:55:14+03:00", "utc": "2037-07-26T05:55:14Z", "ms": 2132200513815.7583 } }, "covered_min": 164, "window_min": 164, "qualifies": true }, { "local_date": "2037-07-27", "window": { "start": { "local": "2037-07-27T06:11:35+03:00", "utc": "2037-07-27T03:11:35Z", "ms": 2132277095190.3315 }, "end": { "local": "2037-07-27T08:55:35+03:00", "utc": "2037-07-27T05:55:35Z", "ms": 2132286934816.9949 } }, "covered_min": 64, "window_min": 164, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul.", "fact": "2037-07-26T03:03:58Z → 2037-07-27T04:15:12Z" }, { "step": "kaala", "text": "The first three muhūrtas after sunrise is first 3 of 15 day muhūrtas: 06:11–08:55 on the 26th, 06:12–08:56 on the 27th.", "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 164 of 164 minutes on the 26th and 64 of 164 on the 27th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102" }, { "step": "tie_break", "text": "Only one morning qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 421 s" }, { "step": "ruling", "text": "Vyāsa Pūjā, Giza, 2037: Sunday 26 July.", "fact": "confidence: determinate" } ], "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": "2037-07-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-26", "confidence": "determinate" } ], "quote": "In Giza, Vyāsa Pūjā 2037 falls on Sunday 26 July. Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul and covers all of the first three muhūrtas after sunrise that morning.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/guru-purnima", "festival": "guru-purnima", "name": "Guru Pūrṇimā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 19342, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-07-26", "window": { "start": { "local": "2037-07-26T12:37:35+03:00", "utc": "2037-07-26T09:37:35Z", "ms": 2132213855180.3267 }, "end": { "local": "2037-07-26T13:25:35+03:00", "utc": "2037-07-26T10:25:35Z", "ms": 2132216735180.3267 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-07-27", "window": { "start": { "local": "2037-07-27T12:37:34+03:00", "utc": "2037-07-27T09:37:34Z", "ms": 2132300254256.9897 }, "end": { "local": "2037-07-27T13:25:34+03:00", "utc": "2037-07-27T10:25:34Z", "ms": 2132303134256.9897 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul.", "fact": "2037-07-26T03:03:58Z → 2037-07-27T04:15:12Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:38–13:26 on the 26th, 12:38–13:26 on the 27th.", "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 26th and 0 of 48 on the 27th.", "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 19342 s" }, { "step": "ruling", "text": "Guru Pūrṇimā, Giza, 2037: Sunday 26 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": "2037-07-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-26", "confidence": "determinate" } ], "quote": "In Giza, Guru Pūrṇimā 2037 falls on Sunday 26 July. Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/kokila-vrata", "festival": "kokila-vrata", "name": "Kokilā Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 35542, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 } }, "kaala": "sayahna", "days": [ { "local_date": "2037-07-26", "window": { "start": { "local": "2037-07-26T17:07:57+03:00", "utc": "2037-07-26T14:07:57Z", "ms": 2132230076544.8953 }, "end": { "local": "2037-07-26T19:52:11+03:00", "utc": "2037-07-26T16:52:11Z", "ms": 2132239930787.941 } }, "covered_min": 164, "window_min": 164, "qualifies": true }, { "local_date": "2037-07-27", "window": { "start": { "local": "2037-07-27T17:07:34+03:00", "utc": "2037-07-27T14:07:34Z", "ms": 2132316453696.9844 }, "end": { "local": "2037-07-27T19:51:33+03:00", "utc": "2037-07-27T16:51:33Z", "ms": 2132326293323.6477 } }, "covered_min": 0, "window_min": 164, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul.", "fact": "2037-07-26T03:03:58Z → 2037-07-27T04:15:12Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 17:08–19:52 on the 26th, 17:08–19:52 on the 27th.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during sāyāhna. It covers 164 of 164 minutes on the 26th and 0 of 164 on the 27th.", "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 35542 s" }, { "step": "ruling", "text": "Kokilā Vrata, Giza, 2037: Sunday 26 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": "2037-07-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-26", "confidence": "determinate" } ], "quote": "In Giza, Kokilā Vrata 2037 falls on Sunday 26 July. Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul and covers all of sāyāhna that late afternoon.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/shiva-shayanotsava", "festival": "shiva-shayanotsava", "name": "Śiva Śayanotsava", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 31726, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 }, "month": { "amanta": 3, "purnimanta": 3, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Āṣāḍha" } }, "span": { "of": "tithi", "start": { "local": "2037-07-26T06:03:58+03:00", "utc": "2037-07-26T03:03:58Z", "ms": 2132190238230.2563 }, "end": { "local": "2037-07-27T07:15:12+03:00", "utc": "2037-07-27T04:15:12Z", "ms": 2132280911999.6182 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-07-25", "window": { "start": { "local": "2037-07-25T19:52:47+03:00", "utc": "2037-07-25T16:52:47Z", "ms": 2132153566925.5996 }, "end": { "local": "2037-07-25T21:15:13+03:00", "utc": "2037-07-25T18:15:13Z", "ms": 2132158512611.8813 } }, "covered_min": 0, "window_min": 82, "qualifies": false }, { "local_date": "2037-07-26", "window": { "start": { "local": "2037-07-26T19:52:11+03:00", "utc": "2037-07-26T16:52:11Z", "ms": 2132239930787.941 }, "end": { "local": "2037-07-26T21:14:46+03:00", "utc": "2037-07-26T18:14:46Z", "ms": 2132244886041.593 } }, "covered_min": 83, "window_min": 83, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul.", "fact": "2037-07-26T03:03:58Z → 2037-07-27T04:15:12Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:53–21:15 on the 25th, 19:52–21:15 on the 26th.", "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 82 minutes on the 25th and 83 of 83 on the 26th.", "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 31726 s" }, { "step": "ruling", "text": "Śiva Śayanotsava, Giza, 2037: Sunday 26 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": "2037-07-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-26", "confidence": "determinate" } ], "quote": "In Giza, Śiva Śayanotsava 2037 falls on Sunday 26 July. Pūrṇimā runs from 06:04 on Sun 26 Jul to 07:15 on Mon 27 Jul and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ashunya-shayana-vrata-ashadha", "festival": "ashunya-shayana-vrata-ashadha", "name": "Aśūnya Śayana Vrata (Āṣāḍha)", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 38459, "anga": { "type": "tithi", "index": 16, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "2037-07-28T08:51:24+03:00", "utc": "2037-07-28T05:51:24Z", "ms": 2132373084283.9153 }, "end": { "local": "2037-07-29T10:49:26+03:00", "utc": "2037-07-29T07:49:26Z", "ms": 2132466566102.6804 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-07-28T08:51:24+03:00", "utc": "2037-07-28T05:51:24Z", "ms": 2132373084283.9153 }, "end": { "local": "2037-07-29T10:49:26+03:00", "utc": "2037-07-29T07:49:26Z", "ms": 2132466566102.6804 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-07-28", "window": { "start": { "local": "2037-07-28T20:54:16+03:00", "utc": "2037-07-28T17:54:16Z", "ms": 2132416455787.5527 }, "end": { "local": "2037-07-28T20:54:16+03:00", "utc": "2037-07-28T17:54:16Z", "ms": 2132416455787.5527 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-07-29", "window": { "start": { "local": "2037-07-29T21:30:26+03:00", "utc": "2037-07-29T18:30:26Z", "ms": 2132505025600.2146 }, "end": { "local": "2037-07-29T21:30:26+03:00", "utc": "2037-07-29T18:30:26Z", "ms": 2132505025600.2146 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 08:51 on Tue 28 Jul to 10:49 on Wed 29 Jul.", "fact": "2037-07-28T05:51:24Z → 2037-07-29T07:49:26Z" }, { "step": "kaala", "text": "Moonrise is at 20:54 on the 28th and 21:30 on the 29th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Dvitīyā must be current at moonrise. It is on the 28th and is not on the 29th.", "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 38459 s" }, { "step": "ruling", "text": "Aśūnya Śayana Vrata (Āṣāḍha), Giza, 2037: Tuesday 28 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": "2037-07-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-28", "confidence": "determinate" } ], "quote": "In Giza, Aśūnya Śayana Vrata (Āṣāḍha) 2037 falls on Tuesday 28 July. Dvitīyā runs from 08:51 on Tue 28 Jul to 10:49 on Wed 29 Jul and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-07-30", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-07-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25580, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-07-30T13:04:23+03:00", "utc": "2037-07-30T10:04:23Z", "ms": 2132561062624.6616 }, "end": { "local": "2037-07-31T15:29:13+03:00", "utc": "2037-07-31T12:29:13Z", "ms": 2132656153052.2593 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-07-30T13:04:23+03:00", "utc": "2037-07-30T10:04:23Z", "ms": 2132561062624.6616 }, "end": { "local": "2037-07-31T15:29:13+03:00", "utc": "2037-07-31T12:29:13Z", "ms": 2132656153052.2593 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-07-30", "window": { "start": { "local": "2037-07-30T22:03:52+03:00", "utc": "2037-07-30T19:03:52Z", "ms": 2132593431659.4958 }, "end": { "local": "2037-07-30T22:03:52+03:00", "utc": "2037-07-30T19:03:52Z", "ms": 2132593431659.4958 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-07-31", "window": { "start": { "local": "2037-07-31T22:35:33+03:00", "utc": "2037-07-31T19:35:33Z", "ms": 2132681732562.8538 }, "end": { "local": "2037-07-31T22:35:33+03:00", "utc": "2037-07-31T19:35:33Z", "ms": 2132681732562.8538 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 13:04 on Thu 30 Jul to 15:29 on Fri 31 Jul.", "fact": "2037-07-30T10:04:23Z → 2037-07-31T12:29:13Z" }, { "step": "kaala", "text": "Moonrise is at 22:04 on the 30th and 22:36 on the 31st.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 30th and is not on the 31st.", "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 25580 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Thursday 30 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": "2037-07-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-07-30", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Thursday 30 July. Caturthī runs from 13:04 on Thu 30 Jul to 15:29 on Fri 31 Jul and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-07-30", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-08-07", "festival": "ekadashi", "name": "Kāmikā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 22101, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-08-07T00:09:50+03:00", "utc": "2037-08-06T21:09:50Z", "ms": 2133205789845.9272 }, "end": { "local": "2037-08-07T23:21:55+03:00", "utc": "2037-08-07T20:21:55Z", "ms": 2133289315003.5496 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-07T00:09:50+03:00", "utc": "2037-08-06T21:09:50Z", "ms": 2133205789845.9272 }, "end": { "local": "2037-08-07T23:21:55+03:00", "utc": "2037-08-07T20:21:55Z", "ms": 2133289315003.5496 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-08-07", "window": { "start": { "local": "2037-08-07T06:18:11+03:00", "utc": "2037-08-07T03:18:11Z", "ms": 2133227891030.4207 }, "end": { "local": "2037-08-07T06:18:11+03:00", "utc": "2037-08-07T03:18:11Z", "ms": 2133227891030.4207 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-08-08", "window": { "start": { "local": "2037-08-08T06:18:47+03:00", "utc": "2037-08-08T03:18:47Z", "ms": 2133314326992.9717 }, "end": { "local": "2037-08-08T06:18:47+03:00", "utc": "2037-08-08T03:18:47Z", "ms": 2133314326992.9717 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 00:10 on Fri 7 Aug to 23:22 on Fri 7 Aug.", "fact": "2037-08-06T21:09:50Z → 2037-08-07T20:21:55Z" }, { "step": "kaala", "text": "Sunrise is at 06:18 on the 7th and 06:19 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 22101 s" }, { "step": "ruling", "text": "Kāmikā Ekādaśī, Giza, 2037: Friday 7 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": "2037-08-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-07", "confidence": "determinate" } ], "quote": "In Giza, Kāmikā Ekādaśī 2037 falls on Friday 7 August. Ekādaśī runs from 00:10 on Fri 7 Aug to 23:22 on Fri 7 Aug and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-08-07", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-08-08", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-08", "confidence": "boundary", "boundary_reasons": [ "margin", "absent-unstated" ], "boundary_margin_s": 262, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-08-08T21:49:30+03:00", "utc": "2037-08-08T18:49:30Z", "ms": 2133370169771.2173 }, "end": { "local": "2037-08-09T19:37:13+03:00", "utc": "2037-08-09T16:37:13Z", "ms": 2133448633051.992 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-08T21:49:30+03:00", "utc": "2037-08-08T18:49:30Z", "ms": 2133370169771.2173 }, "end": { "local": "2037-08-09T19:37:13+03:00", "utc": "2037-08-09T16:37:13Z", "ms": 2133448633051.992 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-08-08", "window": { "start": { "local": "2037-08-08T19:42:28+03:00", "utc": "2037-08-08T16:42:28Z", "ms": 2133362547509.4458 }, "end": { "local": "2037-08-08T21:07:23+03:00", "utc": "2037-08-08T18:07:23Z", "ms": 2133367642893.526 } }, "covered_min": 0, "window_min": 85, "qualifies": false }, { "local_date": "2037-08-09", "window": { "start": { "local": "2037-08-09T19:41:35+03:00", "utc": "2037-08-09T16:41:35Z", "ms": 2133448894627.6118 }, "end": { "local": "2037-08-09T21:06:42+03:00", "utc": "2037-08-09T18:06:42Z", "ms": 2133454001838.1929 } }, "covered_min": 0, "window_min": 85, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 21:49 on Sat 8 Aug to 19:37 on Sun 9 Aug.", "fact": "2037-08-08T18:49:30Z → 2037-08-09T16:37:13Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:42–21:07 on the 8th, 19:42–21:07 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 85 minutes on the 8th and 0 of 85 on the 9th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108" }, { "step": "tie_break", "text": "Neither evening qualifies. The day the tithi falls on is taken.", "fact": "priority: unstated → tithi-day · margin 262 s < 300 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Saturday 8 August.", "fact": "confidence: boundary (margin, absent-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": "2037-08-08", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-08", "confidence": "boundary" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Saturday 8 August. Trayodaśī runs from 21:49 on Sat 8 Aug to 19:37 on Sun 9 Aug, and reaches pradoṣa on neither day. It is 4 min 22 s from a threshold: treat the date as contested.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-08-08", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-08-09", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17974, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-08-09T19:37:13+03:00", "utc": "2037-08-09T16:37:13Z", "ms": 2133448633051.992 }, "end": { "local": "2037-08-10T16:51:51+03:00", "utc": "2037-08-10T13:51:51Z", "ms": 2133525111255.492 }, "month": { "amanta": 3, "purnimanta": 4, "adhika": false, "amanta_name": "Āṣāḍha", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-09T19:37:13+03:00", "utc": "2037-08-09T16:37:13Z", "ms": 2133448633051.992 }, "end": { "local": "2037-08-10T16:51:51+03:00", "utc": "2037-08-10T13:51:51Z", "ms": 2133525111255.492 } }, "kaala": "nishita", "days": [ { "local_date": "2037-08-09", "window": { "start": { "local": "2037-08-10T00:36:47+03:00", "utc": "2037-08-09T21:36:47Z", "ms": 2133466606667.2905 }, "end": { "local": "2037-08-10T01:24:47+03:00", "utc": "2037-08-09T22:24:47Z", "ms": 2133469486667.2905 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-08-10", "window": { "start": { "local": "2037-08-11T00:36:38+03:00", "utc": "2037-08-10T21:36:38Z", "ms": 2133552997565.518 }, "end": { "local": "2037-08-11T01:24:38+03:00", "utc": "2037-08-10T22:24:38Z", "ms": 2133555877565.518 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 19:37 on Sun 9 Aug to 16:52 on Mon 10 Aug.", "fact": "2037-08-09T16:37:13Z → 2037-08-10T13:51:51Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:37–01:25 on the 9th, 00:37–01:25 on the 10th.", "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 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 night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 17974 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Sunday 9 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": "2037-08-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-09", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Sunday 9 August. Caturdaśī runs from 19:37 on Sun 9 Aug to 16:52 on Mon 10 Aug and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-08-09", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/madhusrava-tritiya", "festival": "madhusrava-tritiya", "name": "Madhusravā Tṛtīyā", "everyday": "Hariyali Teej", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 21140, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-08-13T06:43:30+03:00", "utc": "2037-08-13T03:43:30Z", "ms": 2133747809682.0527 }, "end": { "local": "2037-08-14T03:14:38+03:00", "utc": "2037-08-14T00:14:38Z", "ms": 2133821678495.3633 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-13T06:43:30+03:00", "utc": "2037-08-13T03:43:30Z", "ms": 2133747809682.0527 }, "end": { "local": "2037-08-14T03:14:38+03:00", "utc": "2037-08-14T00:14:38Z", "ms": 2133821678495.3633 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-13", "window": { "start": { "local": "2037-08-13T12:35:49+03:00", "utc": "2037-08-13T09:35:49Z", "ms": 2133768949189.5432 }, "end": { "local": "2037-08-13T13:23:49+03:00", "utc": "2037-08-13T10:23:49Z", "ms": 2133771829189.5432 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-08-14", "window": { "start": { "local": "2037-08-14T12:35:38+03:00", "utc": "2037-08-14T09:35:38Z", "ms": 2133855337908.8982 }, "end": { "local": "2037-08-14T13:23:38+03:00", "utc": "2037-08-14T10:23:38Z", "ms": 2133858217908.8982 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 06:43 on Thu 13 Aug to 03:15 on Fri 14 Aug.", "fact": "2037-08-13T03:43:30Z → 2037-08-14T00:14:38Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:36–13:24 on the 13th, 12:36–13:24 on the 14th.", "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 13th and 0 of 48 on the 14th.", "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 21140 s" }, { "step": "ruling", "text": "Madhusravā Tṛtīyā, Giza, 2037: Thursday 13 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": "2037-08-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-13", "confidence": "determinate" } ], "quote": "In Giza, Madhusravā Tṛtīyā (Hariyali Teej) 2037 falls on Thursday 13 August. Tṛtīyā runs from 06:43 on Thu 13 Aug to 03:15 on Fri 14 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-08-14", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33659, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-08-14T03:14:38+03:00", "utc": "2037-08-14T00:14:38Z", "ms": 2133821678495.3633 }, "end": { "local": "2037-08-14T23:58:18+03:00", "utc": "2037-08-14T20:58:18Z", "ms": 2133896298109.2407 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-14T03:14:38+03:00", "utc": "2037-08-14T00:14:38Z", "ms": 2133821678495.3633 }, "end": { "local": "2037-08-14T23:58:18+03:00", "utc": "2037-08-14T20:58:18Z", "ms": 2133896298109.2407 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-14", "window": { "start": { "local": "2037-08-14T12:35:38+03:00", "utc": "2037-08-14T09:35:38Z", "ms": 2133855337908.8982 }, "end": { "local": "2037-08-14T13:23:38+03:00", "utc": "2037-08-14T10:23:38Z", "ms": 2133858217908.8982 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-08-15", "window": { "start": { "local": "2037-08-15T12:35:26+03:00", "utc": "2037-08-15T09:35:26Z", "ms": 2133941726080.954 }, "end": { "local": "2037-08-15T13:23:26+03:00", "utc": "2037-08-15T10:23:26Z", "ms": 2133944606080.954 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 03:15 on Fri 14 Aug to 23:58 on Fri 14 Aug.", "fact": "2037-08-14T00:14:38Z → 2037-08-14T20:58:18Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:36–13:24 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": "Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 14th and 0 of 48 on the 15th.", "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 33659 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Friday 14 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": "2037-08-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-14", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Friday 14 August. Caturthī runs from 03:15 on Fri 14 Aug to 23:58 on Fri 14 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-08-14", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/naga-panchami", "festival": "naga-panchami", "name": "Nāga Pañcamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 27569, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-08-14T23:58:18+03:00", "utc": "2037-08-14T20:58:18Z", "ms": 2133896298109.2407 }, "end": { "local": "2037-08-15T21:02:55+03:00", "utc": "2037-08-15T18:02:55Z", "ms": 2133972175002.4663 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-14T23:58:18+03:00", "utc": "2037-08-14T20:58:18Z", "ms": 2133896298109.2407 }, "end": { "local": "2037-08-15T21:02:55+03:00", "utc": "2037-08-15T18:02:55Z", "ms": 2133972175002.4663 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-14", "window": { "start": { "local": "2037-08-14T12:35:38+03:00", "utc": "2037-08-14T09:35:38Z", "ms": 2133855337908.8982 }, "end": { "local": "2037-08-14T13:23:38+03:00", "utc": "2037-08-14T10:23:38Z", "ms": 2133858217908.8982 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-08-15", "window": { "start": { "local": "2037-08-15T12:35:26+03:00", "utc": "2037-08-15T09:35:26Z", "ms": 2133941726080.954 }, "end": { "local": "2037-08-15T13:23:26+03:00", "utc": "2037-08-15T10:23:26Z", "ms": 2133944606080.954 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 23:58 on Fri 14 Aug to 21:03 on Sat 15 Aug.", "fact": "2037-08-14T20:58:18Z → 2037-08-15T18:02:55Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:36–13:24 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": "Pañcamī 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: paraviddha → only-day · margin 27569 s" }, { "step": "ruling", "text": "Nāga Pañcamī, Giza, 2037: Saturday 15 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": "2037-08-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-15", "confidence": "determinate" } ], "quote": "In Giza, Nāga Pañcamī 2037 falls on Saturday 15 August. Pañcamī runs from 23:58 on Fri 14 Aug to 21:03 on Sat 15 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-08-21", "festival": "ekadashi", "name": "Putradā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30296, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-08-20T14:50:46+03:00", "utc": "2037-08-20T11:50:46Z", "ms": 2134381845668.0454 }, "end": { "local": "2037-08-21T15:26:51+03:00", "utc": "2037-08-21T12:26:51Z", "ms": 2134470411156.6929 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-20T14:50:46+03:00", "utc": "2037-08-20T11:50:46Z", "ms": 2134381845668.0454 }, "end": { "local": "2037-08-21T15:26:51+03:00", "utc": "2037-08-21T12:26:51Z", "ms": 2134470411156.6929 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-08-20", "window": { "start": { "local": "2037-08-20T06:25:50+03:00", "utc": "2037-08-20T03:25:50Z", "ms": 2134351549688.7874 }, "end": { "local": "2037-08-20T06:25:50+03:00", "utc": "2037-08-20T03:25:50Z", "ms": 2134351549688.7874 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-08-21", "window": { "start": { "local": "2037-08-21T06:26:24+03:00", "utc": "2037-08-21T03:26:24Z", "ms": 2134437983903.9624 }, "end": { "local": "2037-08-21T06:26:24+03:00", "utc": "2037-08-21T03:26:24Z", "ms": 2134437983903.9624 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 14:51 on Thu 20 Aug to 15:27 on Fri 21 Aug.", "fact": "2037-08-20T11:50:46Z → 2037-08-21T12:26:51Z" }, { "step": "kaala", "text": "Sunrise is at 06:26 on the 20th and 06:26 on the 21st.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 20th and is on the 21st.", "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 30296 s" }, { "step": "ruling", "text": "Putradā Ekādaśī, Giza, 2037: Friday 21 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": "2037-08-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-21", "confidence": "determinate" } ], "quote": "In Giza, Putradā Ekādaśī 2037 falls on Friday 21 August. Ekādaśī runs from 14:51 on Thu 20 Aug to 15:27 on Fri 21 Aug and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-08-21", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/damodara-dvadashi", "festival": "damodara-dvadashi", "name": "Dāmodara Dvādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7487, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-08-21T15:26:51+03:00", "utc": "2037-08-21T12:26:51Z", "ms": 2134470411156.6929 }, "end": { "local": "2037-08-22T16:33:46+03:00", "utc": "2037-08-22T13:33:46Z", "ms": 2134560825648.754 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-21T15:26:51+03:00", "utc": "2037-08-21T12:26:51Z", "ms": 2134470411156.6929 }, "end": { "local": "2037-08-22T16:33:46+03:00", "utc": "2037-08-22T13:33:46Z", "ms": 2134560825648.754 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-21", "window": { "start": { "local": "2037-08-21T12:34:04+03:00", "utc": "2037-08-21T09:34:04Z", "ms": 2134460044127.3892 }, "end": { "local": "2037-08-21T13:22:04+03:00", "utc": "2037-08-21T10:22:04Z", "ms": 2134462924127.3892 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-08-22", "window": { "start": { "local": "2037-08-22T12:33:49+03:00", "utc": "2037-08-22T09:33:49Z", "ms": 2134546428753.4377 }, "end": { "local": "2037-08-22T13:21:49+03:00", "utc": "2037-08-22T10:21:49Z", "ms": 2134549308753.4377 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 15:27 on Fri 21 Aug to 16:34 on Sat 22 Aug.", "fact": "2037-08-21T12:26:51Z → 2037-08-22T13:33:46Z" }, { "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": "Dvādaśī must be present during madhyāhna. 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 midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 7487 s" }, { "step": "ruling", "text": "Dāmodara Dvādaśī, Giza, 2037: Saturday 22 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": "2037-08-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-22", "confidence": "determinate" } ], "quote": "In Giza, Dāmodara Dvādaśī 2037 falls on Saturday 22 August. Dvādaśī runs from 15:27 on Fri 21 Aug to 16:34 on Sat 22 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-08-22", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4863, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-08-22T16:33:46+03:00", "utc": "2037-08-22T13:33:46Z", "ms": 2134560825648.754 }, "end": { "local": "2037-08-23T18:06:31+03:00", "utc": "2037-08-23T15:06:31Z", "ms": 2134652791213.7295 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-22T16:33:46+03:00", "utc": "2037-08-22T13:33:46Z", "ms": 2134560825648.754 }, "end": { "local": "2037-08-23T18:06:31+03:00", "utc": "2037-08-23T15:06:31Z", "ms": 2134652791213.7295 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-08-22", "window": { "start": { "local": "2037-08-22T19:28:40+03:00", "utc": "2037-08-22T16:28:40Z", "ms": 2134571319554.1414 }, "end": { "local": "2037-08-22T20:56:31+03:00", "utc": "2037-08-22T17:56:31Z", "ms": 2134576590525.4277 } }, "covered_min": 88, "window_min": 88, "qualifies": true }, { "local_date": "2037-08-23", "window": { "start": { "local": "2037-08-23T19:27:34+03:00", "utc": "2037-08-23T16:27:34Z", "ms": 2134657654019.8457 }, "end": { "local": "2037-08-23T20:55:38+03:00", "utc": "2037-08-23T17:55:38Z", "ms": 2134662938226.13 } }, "covered_min": 0, "window_min": 88, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 16:34 on Sat 22 Aug to 18:07 on Sun 23 Aug.", "fact": "2037-08-22T13:33:46Z → 2037-08-23T15:06:31Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:29–20:57 on the 22nd, 19:28–20:56 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 88 of 88 minutes on the 22nd and 0 of 88 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 4863 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Saturday 22 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": "2037-08-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-22", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Saturday 22 August. Trayodaśī runs from 16:34 on Sat 22 Aug to 18:07 on Sun 23 Aug and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-08-22", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/raksha-bandhana", "festival": "raksha-bandhana", "name": "Rakṣā Bandhana", "everyday": "Rakhi", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9263, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-08-24T20:00:02+03:00", "utc": "2037-08-24T17:00:02Z", "ms": 2134746002185.3655 }, "end": { "local": "2037-08-25T22:09:23+03:00", "utc": "2037-08-25T19:09:23Z", "ms": 2134840163323.6274 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "second-half", "start": { "local": "2037-08-25T09:03:02+03:00", "utc": "2037-08-25T06:03:02Z", "ms": 2134792981964.6987 }, "end": { "local": "2037-08-25T22:09:23+03:00", "utc": "2037-08-25T19:09:23Z", "ms": 2134840163323.6274 } }, "kaala": "day", "days": [ { "local_date": "2037-08-24", "window": { "start": { "local": "2037-08-24T06:28:06+03:00", "utc": "2037-08-24T03:28:06Z", "ms": 2134697285566.9766 }, "end": { "local": "2037-08-25T06:28:39+03:00", "utc": "2037-08-25T03:28:39Z", "ms": 2134783719143.1755 } }, "covered_min": 0, "window_min": 1441, "qualifies": false }, { "local_date": "2037-08-25", "window": { "start": { "local": "2037-08-25T06:28:39+03:00", "utc": "2037-08-25T03:28:39Z", "ms": 2134783719143.1755 }, "end": { "local": "2037-08-26T06:29:13+03:00", "utc": "2037-08-26T03:29:13Z", "ms": 2134870152574.1326 } }, "covered_min": 786, "window_min": 1441, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 20:00 on Mon 24 Aug to 22:09 on Tue 25 Aug. Its second half begins at 09:03 on Tue 25 Aug.", "fact": "2037-08-24T17:00:02Z → 2037-08-25T19:09:23Z · second half from 2037-08-25T06:03:02Z" }, { "step": "kaala", "text": "The day runs from sunrise to the next sunrise: from 06:28 on the 24th, and from 06:29 on the 25th.", "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 24th and 786 of 1441 on the 25th.", "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 9263 s" }, { "step": "ruling", "text": "Rakṣā Bandhana, Giza, 2037: Tuesday 25 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": "2037-08-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-25", "confidence": "determinate" } ], "quote": "In Giza, Rakṣā Bandhana (Rakhi) 2037 falls on Tuesday 25 August. The second half of Pūrṇimā runs from 09:03 on Tue 25 Aug to 22:09 on Tue 25 Aug and lies within that day, sunrise to sunrise.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/rishi-tarpana", "festival": "rishi-tarpana", "name": "Ṛṣi Tarpaṇa", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 23926, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-08-24T20:00:02+03:00", "utc": "2037-08-24T17:00:02Z", "ms": 2134746002185.3655 }, "end": { "local": "2037-08-25T22:09:23+03:00", "utc": "2037-08-25T19:09:23Z", "ms": 2134840163323.6274 }, "month": { "amanta": 4, "purnimanta": 4, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Śrāvaṇa" } }, "span": { "of": "tithi", "start": { "local": "2037-08-24T20:00:02+03:00", "utc": "2037-08-24T17:00:02Z", "ms": 2134746002185.3655 }, "end": { "local": "2037-08-25T22:09:23+03:00", "utc": "2037-08-25T19:09:23Z", "ms": 2134840163323.6274 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-24", "window": { "start": { "local": "2037-08-24T12:33:17+03:00", "utc": "2037-08-24T09:33:17Z", "ms": 2134719196671.748 }, "end": { "local": "2037-08-24T13:21:17+03:00", "utc": "2037-08-24T10:21:17Z", "ms": 2134722076671.748 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-08-25", "window": { "start": { "local": "2037-08-25T12:33:00+03:00", "utc": "2037-08-25T09:33:00Z", "ms": 2134805579997.9927 }, "end": { "local": "2037-08-25T13:21:00+03:00", "utc": "2037-08-25T10:21:00Z", "ms": 2134808459997.9927 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 20:00 on Mon 24 Aug to 22:09 on Tue 25 Aug.", "fact": "2037-08-24T17:00:02Z → 2037-08-25T19:09:23Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:33–13:21 on the 24th, 12:33–13:21 on the 25th.", "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 24th and 48 of 48 on the 25th.", "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 23926 s" }, { "step": "ruling", "text": "Ṛṣi Tarpaṇa, Giza, 2037: Tuesday 25 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": "2037-08-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-25", "confidence": "determinate" } ], "quote": "In Giza, Ṛṣi Tarpaṇa 2037 falls on Tuesday 25 August. Pūrṇimā runs from 20:00 on Mon 24 Aug to 22:09 on Tue 25 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ashunya-shayana-vrata", "festival": "ashunya-shayana-vrata", "name": "Aśūnya Śayana Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15906, "anga": { "type": "tithi", "index": 16, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "2037-08-27T00:29:47+03:00", "utc": "2037-08-26T21:29:47Z", "ms": 2134934987073.375 }, "end": { "local": "2037-08-28T02:56:13+03:00", "utc": "2037-08-27T23:56:13Z", "ms": 2135030173001.2095 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-08-27T00:29:47+03:00", "utc": "2037-08-26T21:29:47Z", "ms": 2134934987073.375 }, "end": { "local": "2037-08-28T02:56:13+03:00", "utc": "2037-08-27T23:56:13Z", "ms": 2135030173001.2095 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-08-26", "window": { "start": { "local": "2037-08-26T20:04:41+03:00", "utc": "2037-08-26T17:04:41Z", "ms": 2134919081498.2153 }, "end": { "local": "2037-08-26T20:04:41+03:00", "utc": "2037-08-26T17:04:41Z", "ms": 2134919081498.2153 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-08-27", "window": { "start": { "local": "2037-08-27T20:36:49+03:00", "utc": "2037-08-27T17:36:49Z", "ms": 2135007408657.0718 }, "end": { "local": "2037-08-27T20:36:49+03:00", "utc": "2037-08-27T17:36:49Z", "ms": 2135007408657.0718 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 00:30 on Thu 27 Aug to 02:56 on Fri 28 Aug.", "fact": "2037-08-26T21:29:47Z → 2037-08-27T23:56:13Z" }, { "step": "kaala", "text": "Moonrise is at 20:05 on the 26th and 20:37 on the 27th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Dvitīyā must be current at moonrise. It is not on the 26th and is on the 27th.", "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 15906 s" }, { "step": "ruling", "text": "Aśūnya Śayana Vrata, Giza, 2037: Thursday 27 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": "2037-08-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-27", "confidence": "determinate" } ], "quote": "In Giza, Aśūnya Śayana Vrata 2037 falls on Thursday 27 August. Dvitīyā runs from 00:30 on Thu 27 Aug to 02:56 on Fri 28 Aug and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/kajjali-tritiya", "festival": "kajjali-tritiya", "name": "Kajjalī Tṛtīyā", "everyday": "Kajari Teej", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25731, "anga": { "type": "tithi", "index": 17, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-08-28T02:56:13+03:00", "utc": "2037-08-27T23:56:13Z", "ms": 2135030173001.2095 }, "end": { "local": "2037-08-29T05:22:59+03:00", "utc": "2037-08-29T02:22:59Z", "ms": 2135125378854.1982 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-08-28T02:56:13+03:00", "utc": "2037-08-27T23:56:13Z", "ms": 2135030173001.2095 }, "end": { "local": "2037-08-29T05:22:59+03:00", "utc": "2037-08-29T02:22:59Z", "ms": 2135125378854.1982 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-28", "window": { "start": { "local": "2037-08-28T12:32:08+03:00", "utc": "2037-08-28T09:32:08Z", "ms": 2135064727658.1865 }, "end": { "local": "2037-08-28T13:20:08+03:00", "utc": "2037-08-28T10:20:08Z", "ms": 2135067607658.1865 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-08-29", "window": { "start": { "local": "2037-08-29T12:31:49+03:00", "utc": "2037-08-29T09:31:49Z", "ms": 2135151109499.5867 }, "end": { "local": "2037-08-29T13:19:49+03:00", "utc": "2037-08-29T10:19:49Z", "ms": 2135153989499.5867 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 02:56 on Fri 28 Aug to 05:23 on Sat 29 Aug.", "fact": "2037-08-27T23:56:13Z → 2037-08-29T02:22:59Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 28th, 12:32–13:20 on the 29th.", "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 28th and 0 of 48 on the 29th.", "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 25731 s" }, { "step": "ruling", "text": "Kajjalī Tṛtīyā, Giza, 2037: Friday 28 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": "2037-08-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-28", "confidence": "determinate" } ], "quote": "In Giza, Kajjalī Tṛtīyā (Kajari Teej) 2037 falls on Friday 28 August. Tṛtīyā runs from 02:56 on Fri 28 Aug to 05:23 on Sat 29 Aug and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/bahula-chaturthi", "festival": "bahula-chaturthi", "name": "Bahulā Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32562, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-08-29T05:22:59+03:00", "utc": "2037-08-29T02:22:59Z", "ms": 2135125378854.1982 }, "end": { "local": "2037-08-30T07:43:17+03:00", "utc": "2037-08-30T04:43:17Z", "ms": 2135220196615.9248 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-08-29T05:22:59+03:00", "utc": "2037-08-29T02:22:59Z", "ms": 2135125378854.1982 }, "end": { "local": "2037-08-30T07:43:17+03:00", "utc": "2037-08-30T04:43:17Z", "ms": 2135220196615.9248 } }, "kaala": "sayahna", "days": [ { "local_date": "2037-08-29", "window": { "start": { "local": "2037-08-29T16:46:48+03:00", "utc": "2037-08-29T13:46:48Z", "ms": 2135166407955.546 }, "end": { "local": "2037-08-29T19:20:47+03:00", "utc": "2037-08-29T16:20:47Z", "ms": 2135175646926.1853 } }, "covered_min": 154, "window_min": 154, "qualifies": true }, { "local_date": "2037-08-30", "window": { "start": { "local": "2037-08-30T16:45:59+03:00", "utc": "2037-08-30T13:45:59Z", "ms": 2135252758623.5762 }, "end": { "local": "2037-08-30T19:19:37+03:00", "utc": "2037-08-30T16:19:37Z", "ms": 2135261977028.762 } }, "covered_min": 0, "window_min": 154, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:23 on Sat 29 Aug to 07:43 on Sun 30 Aug.", "fact": "2037-08-29T02:22:59Z → 2037-08-30T04:43:17Z" }, { "step": "kaala", "text": "Sāyāhna is last 3 of 15 day muhūrtas: 16:47–19:21 on the 29th, 16:46–19:20 on the 30th.", "fact": "sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Caturthī must be present during sāyāhna. It covers 154 of 154 minutes on the 29th and 0 of 154 on the 30th.", "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 32562 s" }, { "step": "ruling", "text": "Bahulā Caturthī, Giza, 2037: Saturday 29 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": "2037-08-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-29", "confidence": "determinate" } ], "quote": "In Giza, Bahulā Caturthī 2037 falls on Saturday 29 August. Caturthī runs from 05:23 on Sat 29 Aug to 07:43 on Sun 30 Aug and covers all of sāyāhna that late afternoon.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-08-29", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-29", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 29710, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-08-29T05:22:59+03:00", "utc": "2037-08-29T02:22:59Z", "ms": 2135125378854.1982 }, "end": { "local": "2037-08-30T07:43:17+03:00", "utc": "2037-08-30T04:43:17Z", "ms": 2135220196615.9248 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-08-29T05:22:59+03:00", "utc": "2037-08-29T02:22:59Z", "ms": 2135125378854.1982 }, "end": { "local": "2037-08-30T07:43:17+03:00", "utc": "2037-08-30T04:43:17Z", "ms": 2135220196615.9248 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-08-28", "window": { "start": { "local": "2037-08-28T21:07:49+03:00", "utc": "2037-08-28T18:07:49Z", "ms": 2135095669165.8928 }, "end": { "local": "2037-08-28T21:07:49+03:00", "utc": "2037-08-28T18:07:49Z", "ms": 2135095669165.8928 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-08-29", "window": { "start": { "local": "2037-08-29T21:38:39+03:00", "utc": "2037-08-29T18:38:39Z", "ms": 2135183919286.4795 }, "end": { "local": "2037-08-29T21:38:39+03:00", "utc": "2037-08-29T18:38:39Z", "ms": 2135183919286.4795 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 05:23 on Sat 29 Aug to 07:43 on Sun 30 Aug.", "fact": "2037-08-29T02:22:59Z → 2037-08-30T04:43:17Z" }, { "step": "kaala", "text": "Moonrise is at 21:08 on the 28th and 21:39 on the 29th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 28th and is on the 29th.", "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 29710 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Saturday 29 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": "2037-08-29", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-29", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Saturday 29 August. Caturthī runs from 05:23 on Sat 29 Aug to 07:43 on Sun 30 Aug and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-08-29", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/hala-shashthi", "festival": "hala-shashthi", "name": "Hala Ṣaṣṭhī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-08-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3549, "anga": { "type": "tithi", "index": 20, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-08-31T09:49:07+03:00", "utc": "2037-08-31T06:49:07Z", "ms": 2135314147373.6814 }, "end": { "local": "2037-09-01T11:31:44+03:00", "utc": "2037-09-01T08:31:44Z", "ms": 2135406704453.5115 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-08-31T09:49:07+03:00", "utc": "2037-08-31T06:49:07Z", "ms": 2135314147373.6814 }, "end": { "local": "2037-09-01T11:31:44+03:00", "utc": "2037-09-01T08:31:44Z", "ms": 2135406704453.5115 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-08-31", "window": { "start": { "local": "2037-08-31T12:31:12+03:00", "utc": "2037-08-31T09:31:12Z", "ms": 2135323872225.402 }, "end": { "local": "2037-08-31T13:19:12+03:00", "utc": "2037-08-31T10:19:12Z", "ms": 2135326752225.402 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-01", "window": { "start": { "local": "2037-09-01T12:30:53+03:00", "utc": "2037-09-01T09:30:53Z", "ms": 2135410253146.958 }, "end": { "local": "2037-09-01T13:18:53+03:00", "utc": "2037-09-01T10:18:53Z", "ms": 2135413133146.958 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 09:49 on Mon 31 Aug to 11:32 on Tue 1 Sep.", "fact": "2037-08-31T06:49:07Z → 2037-09-01T08:31:44Z" }, { "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": "Ṣaṣṭhī 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. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 3549 s" }, { "step": "ruling", "text": "Hala Ṣaṣṭhī, Giza, 2037: Monday 31 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": "2037-08-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-08-31", "confidence": "determinate" } ], "quote": "In Giza, Hala Ṣaṣṭhī 2037 falls on Monday 31 August. Ṣaṣṭhī runs from 09:49 on Mon 31 Aug to 11:32 on Tue 1 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/shitala-saptami", "festival": "shitala-saptami", "name": "Śītalā Saptamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-01", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 711, "anga": { "type": "tithi", "index": 21, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-09-01T11:31:44+03:00", "utc": "2037-09-01T08:31:44Z", "ms": 2135406704453.5115 }, "end": { "local": "2037-09-02T12:42:25+03:00", "utc": "2037-09-02T09:42:25Z", "ms": 2135497344831.2034 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-01T11:31:44+03:00", "utc": "2037-09-01T08:31:44Z", "ms": 2135406704453.5115 }, "end": { "local": "2037-09-02T12:42:25+03:00", "utc": "2037-09-02T09:42:25Z", "ms": 2135497344831.2034 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-01", "window": { "start": { "local": "2037-09-01T12:30:53+03:00", "utc": "2037-09-01T09:30:53Z", "ms": 2135410253146.958 }, "end": { "local": "2037-09-01T13:18:53+03:00", "utc": "2037-09-01T10:18:53Z", "ms": 2135413133146.958 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-02", "window": { "start": { "local": "2037-09-02T12:30:34+03:00", "utc": "2037-09-02T09:30:34Z", "ms": 2135496633798.9192 }, "end": { "local": "2037-09-02T13:18:34+03:00", "utc": "2037-09-02T10:18:34Z", "ms": 2135499513798.9192 } }, "covered_min": 12, "window_min": 48, "qualifies": true } ], "decided_by": "purvaviddha", "explanation": [ { "step": "anga", "text": "Saptamī runs from 11:32 on Tue 1 Sep to 12:42 on Wed 2 Sep.", "fact": "2037-09-01T08:31:44Z → 2037-09-02T09:42:25Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:31–13:19 on the 1st, 12:31–13:19 on the 2nd.", "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 1st and 12 of 48 on the 2nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Both middays qualify. Pūrvaviddhā: the first is taken.", "fact": "priority: purvaviddha → purvaviddha · margin 711 s" }, { "step": "ruling", "text": "Śītalā Saptamī, Giza, 2037: Tuesday 1 September.", "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": "2037-09-01", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-01", "confidence": "determinate" } ], "quote": "In Giza, Śītalā Saptamī 2037 falls on Tuesday 1 September. Saptamī runs from 11:32 on Tue 1 Sep to 12:42 on Wed 2 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 12 minutes; by the rule the first midday is taken.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/janmashtami", "festival": "janmashtami", "name": "Janmāṣṭamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 40613, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-09-02T12:42:25+03:00", "utc": "2037-09-02T09:42:25Z", "ms": 2135497344831.2034 }, "end": { "local": "2037-09-03T13:13:37+03:00", "utc": "2037-09-03T10:13:37Z", "ms": 2135585617187.988 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-02T12:42:25+03:00", "utc": "2037-09-02T09:42:25Z", "ms": 2135497344831.2034 }, "end": { "local": "2037-09-03T13:13:37+03:00", "utc": "2037-09-03T10:13:37Z", "ms": 2135585617187.988 } }, "kaala": "nishita", "days": [ { "local_date": "2037-09-02", "window": { "start": { "local": "2037-09-03T00:30:50+03:00", "utc": "2037-09-02T21:30:50Z", "ms": 2135539850085.0571 }, "end": { "local": "2037-09-03T01:18:50+03:00", "utc": "2037-09-02T22:18:50Z", "ms": 2135542730085.0571 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-03", "window": { "start": { "local": "2037-09-04T00:30:30+03:00", "utc": "2037-09-03T21:30:30Z", "ms": 2135626230452.3801 }, "end": { "local": "2037-09-04T01:18:30+03:00", "utc": "2037-09-03T22:18:30Z", "ms": 2135629110452.3801 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 12:42 on Wed 2 Sep to 13:14 on Thu 3 Sep.", "fact": "2037-09-02T09:42:25Z → 2037-09-03T10:13:37Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:31–01:19 on the 2nd, 00:31–01:19 on the 3rd.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī 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. 103" }, { "step": "tie_break", "text": "Only one night qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 40613 s" }, { "step": "ruling", "text": "Janmāṣṭamī, Giza, 2037: Wednesday 2 September.", "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": "2037-09-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-02", "confidence": "determinate" } ], "quote": "In Giza, Janmāṣṭamī 2037 falls on Wednesday 2 September. Aṣṭamī runs from 12:42 on Wed 2 Sep to 13:14 on Thu 3 Sep and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-09-06", "festival": "ekadashi", "name": "Ajā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13090, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-09-05T11:59:42+03:00", "utc": "2037-09-05T08:59:42Z", "ms": 2135753981816.954 }, "end": { "local": "2037-09-06T10:13:24+03:00", "utc": "2037-09-06T07:13:24Z", "ms": 2135834003603.6538 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-05T11:59:42+03:00", "utc": "2037-09-05T08:59:42Z", "ms": 2135753981816.954 }, "end": { "local": "2037-09-06T10:13:24+03:00", "utc": "2037-09-06T07:13:24Z", "ms": 2135834003603.6538 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-09-05", "window": { "start": { "local": "2037-09-05T06:34:41+03:00", "utc": "2037-09-05T03:34:41Z", "ms": 2135734480735.316 }, "end": { "local": "2037-09-05T06:34:41+03:00", "utc": "2037-09-05T03:34:41Z", "ms": 2135734480735.316 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-09-06", "window": { "start": { "local": "2037-09-06T06:35:13+03:00", "utc": "2037-09-06T03:35:13Z", "ms": 2135820913132.5916 }, "end": { "local": "2037-09-06T06:35:13+03:00", "utc": "2037-09-06T03:35:13Z", "ms": 2135820913132.5916 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 12:00 on Sat 5 Sep to 10:13 on Sun 6 Sep.", "fact": "2037-09-05T08:59:42Z → 2037-09-06T07:13:24Z" }, { "step": "kaala", "text": "Sunrise is at 06:35 on the 5th and 06:35 on the 6th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 5th and is on the 6th.", "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 13090 s" }, { "step": "ruling", "text": "Ajā Ekādaśī, Giza, 2037: Sunday 6 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": "2037-09-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-06", "confidence": "determinate" } ], "quote": "In Giza, Ajā Ekādaśī 2037 falls on Sunday 6 September. Ekādaśī runs from 12:00 on Sat 5 Sep to 10:13 on Sun 6 Sep and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-09-06", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-09-07", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28830, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-09-07T07:45:18+03:00", "utc": "2037-09-07T04:45:18Z", "ms": 2135911517818.0137 }, "end": { "local": "2037-09-08T04:42:02+03:00", "utc": "2037-09-08T01:42:02Z", "ms": 2135986922017.1516 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-07T07:45:18+03:00", "utc": "2037-09-07T04:45:18Z", "ms": 2135911517818.0137 }, "end": { "local": "2037-09-08T04:42:02+03:00", "utc": "2037-09-08T01:42:02Z", "ms": 2135986922017.1516 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-09-06", "window": { "start": { "local": "2037-09-06T19:11:15+03:00", "utc": "2037-09-06T16:11:15Z", "ms": 2135866275007.0493 }, "end": { "local": "2037-09-06T20:42:31+03:00", "utc": "2037-09-06T17:42:31Z", "ms": 2135871751070.9724 } }, "covered_min": 0, "window_min": 91, "qualifies": false }, { "local_date": "2037-09-07", "window": { "start": { "local": "2037-09-07T19:10:02+03:00", "utc": "2037-09-07T16:10:02Z", "ms": 2135952601790.112 }, "end": { "local": "2037-09-07T20:41:32+03:00", "utc": "2037-09-07T17:41:32Z", "ms": 2135958091925.1582 } }, "covered_min": 92, "window_min": 92, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 07:45 on Mon 7 Sep to 04:42 on Tue 8 Sep.", "fact": "2037-09-07T04:45:18Z → 2037-09-08T01:42:02Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:11–20:43 on the 6th, 19:10–20:42 on the 7th.", "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 91 minutes on the 6th and 92 of 92 on the 7th.", "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 28830 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Monday 7 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": "2037-09-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-07", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Monday 7 September. Trayodaśī runs from 07:45 on Mon 7 Sep to 04:42 on Tue 8 Sep and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-09-07", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/aghora-chaturdashi", "festival": "aghora-chaturdashi", "name": "Aghora Caturdaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16297, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-09-08T04:42:02+03:00", "utc": "2037-09-08T01:42:02Z", "ms": 2135986922017.1516 }, "end": { "local": "2037-09-09T01:12:09+03:00", "utc": "2037-09-08T22:12:09Z", "ms": 2136060729161.0806 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-08T04:42:02+03:00", "utc": "2037-09-08T01:42:02Z", "ms": 2135986922017.1516 }, "end": { "local": "2037-09-09T01:12:09+03:00", "utc": "2037-09-08T22:12:09Z", "ms": 2136060729161.0806 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-09-07", "window": { "start": { "local": "2037-09-07T19:10:02+03:00", "utc": "2037-09-07T16:10:02Z", "ms": 2135952601790.112 }, "end": { "local": "2037-09-07T20:41:32+03:00", "utc": "2037-09-07T17:41:32Z", "ms": 2135958091925.1582 } }, "covered_min": 0, "window_min": 92, "qualifies": false }, { "local_date": "2037-09-08", "window": { "start": { "local": "2037-09-08T19:08:48+03:00", "utc": "2037-09-08T16:08:48Z", "ms": 2136038928273.454 }, "end": { "local": "2037-09-08T20:40:33+03:00", "utc": "2037-09-08T17:40:33Z", "ms": 2136044432515.3066 } }, "covered_min": 92, "window_min": 92, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 04:42 on Tue 8 Sep to 01:12 on Wed 9 Sep.", "fact": "2037-09-08T01:42:02Z → 2037-09-08T22:12:09Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 19:10–20:42 on the 7th, 19:09–20:41 on the 8th.", "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 92 minutes on the 7th and 92 of 92 on the 8th.", "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 16297 s" }, { "step": "ruling", "text": "Aghora Caturdaśī, Giza, 2037: Tuesday 8 September.", "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": "2037-09-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-08", "confidence": "determinate" } ], "quote": "In Giza, Aghora Caturdaśī 2037 falls on Tuesday 8 September. Caturdaśī runs from 04:42 on Tue 8 Sep to 01:12 on Wed 9 Sep and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/shivaratri?on=2037-09-08", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-08", "confidence": "boundary", "boundary_reasons": [ "margin" ], "boundary_margin_s": 280, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-09-08T04:42:02+03:00", "utc": "2037-09-08T01:42:02Z", "ms": 2135986922017.1516 }, "end": { "local": "2037-09-09T01:12:09+03:00", "utc": "2037-09-08T22:12:09Z", "ms": 2136060729161.0806 }, "month": { "amanta": 4, "purnimanta": 5, "adhika": false, "amanta_name": "Śrāvaṇa", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-08T04:42:02+03:00", "utc": "2037-09-08T01:42:02Z", "ms": 2135986922017.1516 }, "end": { "local": "2037-09-09T01:12:09+03:00", "utc": "2037-09-08T22:12:09Z", "ms": 2136060729161.0806 } }, "kaala": "nishita", "days": [ { "local_date": "2037-09-07", "window": { "start": { "local": "2037-09-08T00:29:10+03:00", "utc": "2037-09-07T21:29:10Z", "ms": 2135971749796.535 }, "end": { "local": "2037-09-08T01:17:10+03:00", "utc": "2037-09-07T22:17:10Z", "ms": 2135974629796.535 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-09-08", "window": { "start": { "local": "2037-09-09T00:28:49+03:00", "utc": "2037-09-08T21:28:49Z", "ms": 2136058129180.401 }, "end": { "local": "2037-09-09T01:16:49+03:00", "utc": "2037-09-08T22:16:49Z", "ms": 2136061009180.401 } }, "covered_min": 43, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 04:42 on Tue 8 Sep to 01:12 on Wed 9 Sep.", "fact": "2037-09-08T01:42:02Z → 2037-09-08T22:12:09Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:29–01:17 on the 7th, 00:29–01:17 on the 8th.", "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 7th and 43 of 48 on the 8th.", "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 280 s < 300 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Tuesday 8 September.", "fact": "confidence: boundary (margin)" } ], "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": "2037-09-08", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-08", "confidence": "boundary" } ], "quote": "In Giza, Śivarātri 2037 falls on Tuesday 8 September. Caturdaśī runs from 04:42 on Tue 8 Sep to 01:12 on Wed 9 Sep and covers 43 of 48 minutes of niśītha that night. It is 4 min 40 s from a threshold: treat the date as contested.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-09-08", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/rudra-vrata", "festival": "rudra-vrata", "name": "Rudra Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15420, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-09-09T21:25:32+03:00", "utc": "2037-09-09T18:25:32Z", "ms": 2136133531877.5342 }, "end": { "local": "2037-09-10T17:32:51+03:00", "utc": "2037-09-10T14:32:51Z", "ms": 2136205971056.1753 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-09T21:25:32+03:00", "utc": "2037-09-09T18:25:32Z", "ms": 2136133531877.5342 }, "end": { "local": "2037-09-10T17:32:51+03:00", "utc": "2037-09-10T14:32:51Z", "ms": 2136205971056.1753 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-09", "window": { "start": { "local": "2037-09-09T12:28:12+03:00", "utc": "2037-09-09T09:28:12Z", "ms": 2136101292283.7026 }, "end": { "local": "2037-09-09T13:16:12+03:00", "utc": "2037-09-09T10:16:12Z", "ms": 2136104172283.7026 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-09-10", "window": { "start": { "local": "2037-09-10T12:27:51+03:00", "utc": "2037-09-10T09:27:51Z", "ms": 2136187671388.3628 }, "end": { "local": "2037-09-10T13:15:51+03:00", "utc": "2037-09-10T10:15:51Z", "ms": 2136190551388.3628 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 21:26 on Wed 9 Sep to 17:33 on Thu 10 Sep.", "fact": "2037-09-09T18:25:32Z → 2037-09-10T14:32:51Z" }, { "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": "Pratipadā 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. 103" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: purvaviddha → only-day · margin 15420 s" }, { "step": "ruling", "text": "Rudra Vrata, Giza, 2037: Thursday 10 September.", "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": "2037-09-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-10", "confidence": "determinate" } ], "quote": "In Giza, Rudra Vrata 2037 falls on Thursday 10 September. Pratipadā runs from 21:26 on Wed 9 Sep to 17:33 on Thu 10 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ganesha-chaturthi", "festival": "ganesha-chaturthi", "name": "Gaṇeśa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8031, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-09-12T10:13:18+03:00", "utc": "2037-09-12T07:13:18Z", "ms": 2136352398261.7913 }, "end": { "local": "2037-09-13T07:07:40+03:00", "utc": "2037-09-13T04:07:40Z", "ms": 2136427660055.5786 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-12T10:13:18+03:00", "utc": "2037-09-12T07:13:18Z", "ms": 2136352398261.7913 }, "end": { "local": "2037-09-13T07:07:40+03:00", "utc": "2037-09-13T04:07:40Z", "ms": 2136427660055.5786 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-12", "window": { "start": { "local": "2037-09-12T12:27:09+03:00", "utc": "2037-09-12T09:27:09Z", "ms": 2136360429230.6812 }, "end": { "local": "2037-09-12T13:15:09+03:00", "utc": "2037-09-12T10:15:09Z", "ms": 2136363309230.6812 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-13", "window": { "start": { "local": "2037-09-13T12:26:48+03:00", "utc": "2037-09-13T09:26:48Z", "ms": 2136446807997.454 }, "end": { "local": "2037-09-13T13:14:48+03:00", "utc": "2037-09-13T10:14:48Z", "ms": 2136449687997.454 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 10:13 on Sat 12 Sep to 07:08 on Sun 13 Sep.", "fact": "2037-09-12T07:13:18Z → 2037-09-13T04:07:40Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:27–13:15 on the 12th, 12:27–13:15 on the 13th.", "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 12th and 0 of 48 on the 13th.", "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 8031 s" }, { "step": "ruling", "text": "Gaṇeśa Caturthī, Giza, 2037: Saturday 12 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": "2037-09-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-12", "confidence": "determinate" } ], "quote": "In Giza, Gaṇeśa Caturthī 2037 falls on Saturday 12 September. Caturthī runs from 10:13 on Sat 12 Sep to 07:08 on Sun 13 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/haritalika-vrata", "festival": "haritalika-vrata", "name": "Haritālikā Vrata", "everyday": "Hartalika Teej", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1778, "anga": { "type": "tithi", "index": 2, "key": "tritiya", "name": "Tṛtīyā", "start": { "local": "2037-09-11T13:45:08+03:00", "utc": "2037-09-11T10:45:08Z", "ms": 2136278708156.28 }, "end": { "local": "2037-09-12T10:13:18+03:00", "utc": "2037-09-12T07:13:18Z", "ms": 2136352398261.7913 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-11T13:45:08+03:00", "utc": "2037-09-11T10:45:08Z", "ms": 2136278708156.28 }, "end": { "local": "2037-09-12T10:13:18+03:00", "utc": "2037-09-12T07:13:18Z", "ms": 2136352398261.7913 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-11", "window": { "start": { "local": "2037-09-11T12:27:30+03:00", "utc": "2037-09-11T09:27:30Z", "ms": 2136274050365.8457 }, "end": { "local": "2037-09-11T13:15:30+03:00", "utc": "2037-09-11T10:15:30Z", "ms": 2136276930365.8457 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-09-12", "window": { "start": { "local": "2037-09-12T12:27:09+03:00", "utc": "2037-09-12T09:27:09Z", "ms": 2136360429230.6812 }, "end": { "local": "2037-09-12T13:15:09+03:00", "utc": "2037-09-12T10:15:09Z", "ms": 2136363309230.6812 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "second-day", "explanation": [ { "step": "anga", "text": "Tṛtīyā runs from 13:45 on Fri 11 Sep to 10:13 on Sat 12 Sep.", "fact": "2037-09-11T10:45:08Z → 2037-09-12T07:13:18Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 11th, 12:27–13:15 on the 12th.", "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 11th and 0 of 48 on the 12th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Neither midday qualifies. The rule takes the second day.", "fact": "priority: paraviddha → second-day · margin 1778 s" }, { "step": "ruling", "text": "Haritālikā Vrata, Giza, 2037: Saturday 12 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": "2037-09-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-11", "confidence": "determinate" } ], "quote": "In Giza, Haritālikā Vrata (Hartalika Teej) 2037 falls on Saturday 12 September. Tṛtīyā runs from 13:45 on Fri 11 Sep to 10:13 on Sat 12 Sep, and reaches madhyāhna on neither day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/rishi-panchami", "festival": "rishi-panchami", "name": "Ṛṣi Pañcamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 19148, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-09-13T07:07:40+03:00", "utc": "2037-09-13T04:07:40Z", "ms": 2136427660055.5786 }, "end": { "local": "2037-09-14T04:37:20+03:00", "utc": "2037-09-14T01:37:20Z", "ms": 2136505039584.3884 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-13T07:07:40+03:00", "utc": "2037-09-13T04:07:40Z", "ms": 2136427660055.5786 }, "end": { "local": "2037-09-14T04:37:20+03:00", "utc": "2037-09-14T01:37:20Z", "ms": 2136505039584.3884 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-13", "window": { "start": { "local": "2037-09-13T12:26:48+03:00", "utc": "2037-09-13T09:26:48Z", "ms": 2136446807997.454 }, "end": { "local": "2037-09-13T13:14:48+03:00", "utc": "2037-09-13T10:14:48Z", "ms": 2136449687997.454 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-14", "window": { "start": { "local": "2037-09-14T12:26:27+03:00", "utc": "2037-09-14T09:26:27Z", "ms": 2136533186683.5388 }, "end": { "local": "2037-09-14T13:14:27+03:00", "utc": "2037-09-14T10:14:27Z", "ms": 2136536066683.5388 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 07:08 on Sun 13 Sep to 04:37 on Mon 14 Sep.", "fact": "2037-09-13T04:07:40Z → 2037-09-14T01:37:20Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:27–13:15 on the 13th, 12:26–13:14 on the 14th.", "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 13th and 0 of 48 on the 14th.", "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 19148 s" }, { "step": "ruling", "text": "Ṛṣi Pañcamī, Giza, 2037: Sunday 13 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": "2037-09-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-13", "confidence": "determinate" } ], "quote": "In Giza, Ṛṣi Pañcamī 2037 falls on Sunday 13 September. Pañcamī runs from 07:08 on Sun 13 Sep to 04:37 on Mon 14 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/surya-shashthi-bhadrapada", "festival": "surya-shashthi-bhadrapada", "name": "Sūrya Ṣaṣṭhī (Bhādrapada)", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28147, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-09-14T04:37:20+03:00", "utc": "2037-09-14T01:37:20Z", "ms": 2136505039584.3884 }, "end": { "local": "2037-09-15T02:49:27+03:00", "utc": "2037-09-14T23:49:27Z", "ms": 2136584967268.258 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-14T04:37:20+03:00", "utc": "2037-09-14T01:37:20Z", "ms": 2136505039584.3884 }, "end": { "local": "2037-09-15T02:49:27+03:00", "utc": "2037-09-14T23:49:27Z", "ms": 2136584967268.258 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-14", "window": { "start": { "local": "2037-09-14T12:26:27+03:00", "utc": "2037-09-14T09:26:27Z", "ms": 2136533186683.5388 }, "end": { "local": "2037-09-14T13:14:27+03:00", "utc": "2037-09-14T10:14:27Z", "ms": 2136536066683.5388 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-15", "window": { "start": { "local": "2037-09-15T12:26:05+03:00", "utc": "2037-09-15T09:26:05Z", "ms": 2136619565306.622 }, "end": { "local": "2037-09-15T13:14:05+03:00", "utc": "2037-09-15T10:14:05Z", "ms": 2136622445306.622 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 04:37 on Mon 14 Sep to 02:49 on Tue 15 Sep.", "fact": "2037-09-14T01:37:20Z → 2037-09-14T23:49:27Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:26–13:14 on the 14th, 12:26–13:14 on the 15th.", "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 14th and 0 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: paraviddha → only-day · margin 28147 s" }, { "step": "ruling", "text": "Sūrya Ṣaṣṭhī (Bhādrapada), Giza, 2037: Monday 14 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": "2037-09-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-14", "confidence": "determinate" } ], "quote": "In Giza, Sūrya Ṣaṣṭhī (Bhādrapada) 2037 falls on Monday 14 September. Ṣaṣṭhī runs from 04:37 on Mon 14 Sep to 02:49 on Tue 15 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/muktabharana-vrata", "festival": "muktabharana-vrata", "name": "Muktābharaṇa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 34598, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-09-15T02:49:27+03:00", "utc": "2037-09-14T23:49:27Z", "ms": 2136584967268.258 }, "end": { "local": "2037-09-16T01:48:32+03:00", "utc": "2037-09-15T22:48:32Z", "ms": 2136667712286.5186 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-15T02:49:27+03:00", "utc": "2037-09-14T23:49:27Z", "ms": 2136584967268.258 }, "end": { "local": "2037-09-16T01:48:32+03:00", "utc": "2037-09-15T22:48:32Z", "ms": 2136667712286.5186 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-15", "window": { "start": { "local": "2037-09-15T12:26:05+03:00", "utc": "2037-09-15T09:26:05Z", "ms": 2136619565306.622 }, "end": { "local": "2037-09-15T13:14:05+03:00", "utc": "2037-09-15T10:14:05Z", "ms": 2136622445306.622 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-16", "window": { "start": { "local": "2037-09-16T12:25:44+03:00", "utc": "2037-09-16T09:25:44Z", "ms": 2136705943885.8418 }, "end": { "local": "2037-09-16T13:13:44+03:00", "utc": "2037-09-16T10:13:44Z", "ms": 2136708823885.8418 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 02:49 on Tue 15 Sep to 01:49 on Wed 16 Sep.", "fact": "2037-09-14T23:49:27Z → 2037-09-15T22:48:32Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:26–13:14 on the 15th, 12:26–13:14 on the 16th.", "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 15th and 0 of 48 on the 16th.", "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 34598 s" }, { "step": "ruling", "text": "Muktābharaṇa Vrata, Giza, 2037: Tuesday 15 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": "2037-09-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-15", "confidence": "determinate" } ], "quote": "In Giza, Muktābharaṇa Vrata 2037 falls on Tuesday 15 September. Saptamī runs from 02:49 on Tue 15 Sep to 01:49 on Wed 16 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/radhashtami", "festival": "radhashtami", "name": "Rādhāṣṭamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 38232, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-09-16T01:48:32+03:00", "utc": "2037-09-15T22:48:32Z", "ms": 2136667712286.5186 }, "end": { "local": "2037-09-17T01:35:44+03:00", "utc": "2037-09-16T22:35:44Z", "ms": 2136753344416.4707 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-16T01:48:32+03:00", "utc": "2037-09-15T22:48:32Z", "ms": 2136667712286.5186 }, "end": { "local": "2037-09-17T01:35:44+03:00", "utc": "2037-09-16T22:35:44Z", "ms": 2136753344416.4707 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-16", "window": { "start": { "local": "2037-09-16T12:25:44+03:00", "utc": "2037-09-16T09:25:44Z", "ms": 2136705943885.8418 }, "end": { "local": "2037-09-16T13:13:44+03:00", "utc": "2037-09-16T10:13:44Z", "ms": 2136708823885.8418 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-17", "window": { "start": { "local": "2037-09-17T12:25:22+03:00", "utc": "2037-09-17T09:25:22Z", "ms": 2136792322441.3643 }, "end": { "local": "2037-09-17T13:13:22+03:00", "utc": "2037-09-17T10:13:22Z", "ms": 2136795202441.3643 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 01:49 on Wed 16 Sep to 01:36 on Thu 17 Sep.", "fact": "2037-09-15T22:48:32Z → 2037-09-16T22:35:44Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:26–13:14 on the 16th, 12:25–13:13 on the 17th.", "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 16th and 0 of 48 on the 17th.", "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 38232 s" }, { "step": "ruling", "text": "Rādhāṣṭamī, Giza, 2037: Wednesday 16 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": "2037-09-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-16", "confidence": "determinate" } ], "quote": "In Giza, Rādhāṣṭamī 2037 falls on Wednesday 16 September. Aṣṭamī runs from 01:49 on Wed 16 Sep to 01:36 on Thu 17 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-09-19", "festival": "ekadashi", "name": "Parivartanī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5791, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-09-19T03:21:29+03:00", "utc": "2037-09-19T00:21:29Z", "ms": 2136932489148.8794 }, "end": { "local": "2037-09-20T05:06:14+03:00", "utc": "2037-09-20T02:06:14Z", "ms": 2137025173883.2246 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-19T03:21:29+03:00", "utc": "2037-09-19T00:21:29Z", "ms": 2136932489148.8794 }, "end": { "local": "2037-09-20T05:06:14+03:00", "utc": "2037-09-20T02:06:14Z", "ms": 2137025173883.2246 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-09-19", "window": { "start": { "local": "2037-09-19T06:42:13+03:00", "utc": "2037-09-19T03:42:13Z", "ms": 2136944532568.7283 }, "end": { "local": "2037-09-19T06:42:13+03:00", "utc": "2037-09-19T03:42:13Z", "ms": 2136944532568.7283 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-09-20", "window": { "start": { "local": "2037-09-20T06:42:45+03:00", "utc": "2037-09-20T03:42:45Z", "ms": 2137030964999.2651 }, "end": { "local": "2037-09-20T06:42:45+03:00", "utc": "2037-09-20T03:42:45Z", "ms": 2137030964999.2651 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 03:21 on Sat 19 Sep to 05:06 on Sun 20 Sep.", "fact": "2037-09-19T00:21:29Z → 2037-09-20T02:06:14Z" }, { "step": "kaala", "text": "Sunrise is at 06:42 on the 19th and 06:43 on the 20th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 19th and is not on the 20th.", "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 5791 s" }, { "step": "ruling", "text": "Parivartanī Ekādaśī, Giza, 2037: Saturday 19 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": "2037-09-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-19", "confidence": "determinate" } ], "quote": "In Giza, Parivartanī Ekādaśī 2037 falls on Saturday 19 September. Ekādaśī runs from 03:21 on Sat 19 Sep to 05:06 on Sun 20 Sep and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-09-19", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vamana-jayanti", "festival": "vamana-jayanti", "name": "Vāmana Jayantī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-20", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18611, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-09-20T05:06:14+03:00", "utc": "2037-09-20T02:06:14Z", "ms": 2137025173883.2246 }, "end": { "local": "2037-09-21T07:13:46+03:00", "utc": "2037-09-21T04:13:46Z", "ms": 2137119225843.9622 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-20T05:06:14+03:00", "utc": "2037-09-20T02:06:14Z", "ms": 2137025173883.2246 }, "end": { "local": "2037-09-21T07:13:46+03:00", "utc": "2037-09-21T04:13:46Z", "ms": 2137119225843.9622 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-09-20", "window": { "start": { "local": "2037-09-20T12:24:18+03:00", "utc": "2037-09-20T09:24:18Z", "ms": 2137051458179.0674 }, "end": { "local": "2037-09-20T13:12:18+03:00", "utc": "2037-09-20T10:12:18Z", "ms": 2137054338179.0674 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-09-21", "window": { "start": { "local": "2037-09-21T12:23:57+03:00", "utc": "2037-09-21T09:23:57Z", "ms": 2137137836855.9473 }, "end": { "local": "2037-09-21T13:11:57+03:00", "utc": "2037-09-21T10:11:57Z", "ms": 2137140716855.9473 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 05:06 on Sun 20 Sep to 07:14 on Mon 21 Sep.", "fact": "2037-09-20T02:06:14Z → 2037-09-21T04:13:46Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:24–13:12 on the 20th, 12:24–13:12 on the 21st.", "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 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: unstated → only-day · margin 18611 s" }, { "step": "ruling", "text": "Vāmana Jayantī, Giza, 2037: Sunday 20 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": "2037-09-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-20", "confidence": "determinate" } ], "quote": "In Giza, Vāmana Jayantī 2037 falls on Sunday 20 September. Dvādaśī runs from 05:06 on Sun 20 Sep to 07:14 on Mon 21 Sep and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-09-21", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 33363, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-09-21T07:13:46+03:00", "utc": "2037-09-21T04:13:46Z", "ms": 2137119225843.9622 }, "end": { "local": "2037-09-22T09:35:18+03:00", "utc": "2037-09-22T06:35:18Z", "ms": 2137214117721.9226 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-21T07:13:46+03:00", "utc": "2037-09-21T04:13:46Z", "ms": 2137119225843.9622 }, "end": { "local": "2037-09-22T09:35:18+03:00", "utc": "2037-09-22T06:35:18Z", "ms": 2137214117721.9226 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-09-21", "window": { "start": { "local": "2037-09-21T18:52:36+03:00", "utc": "2037-09-21T15:52:36Z", "ms": 2137161156194.4702 }, "end": { "local": "2037-09-21T20:27:26+03:00", "utc": "2037-09-21T17:27:26Z", "ms": 2137166846053.7903 } }, "covered_min": 95, "window_min": 95, "qualifies": true }, { "local_date": "2037-09-22", "window": { "start": { "local": "2037-09-22T18:51:21+03:00", "utc": "2037-09-22T15:51:21Z", "ms": 2137247481099.8926 }, "end": { "local": "2037-09-22T20:26:25+03:00", "utc": "2037-09-22T17:26:25Z", "ms": 2137253185337.4634 } }, "covered_min": 0, "window_min": 95, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 07:14 on Mon 21 Sep to 09:35 on Tue 22 Sep.", "fact": "2037-09-21T04:13:46Z → 2037-09-22T06:35:18Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:53–20:27 on the 21st, 18:51–20:26 on the 22nd.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 95 of 95 minutes on the 21st and 0 of 95 on the 22nd.", "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 33363 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Monday 21 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": "2037-09-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-21", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Monday 21 September. Trayodaśī runs from 07:14 on Mon 21 Sep to 09:35 on Tue 22 Sep and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-09-21", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ananta-chaturdashi", "festival": "ananta-chaturdashi", "name": "Ananta Caturdaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-23", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1557, "anga": { "type": "tithi", "index": 13, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-09-22T09:35:18+03:00", "utc": "2037-09-22T06:35:18Z", "ms": 2137214117721.9226 }, "end": { "local": "2037-09-23T12:03:17+03:00", "utc": "2037-09-23T09:03:17Z", "ms": 2137309397100.2258 }, "month": { "amanta": 5, "purnimanta": 5, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Bhādrapada" } }, "span": { "of": "tithi", "start": { "local": "2037-09-22T09:35:18+03:00", "utc": "2037-09-22T06:35:18Z", "ms": 2137214117721.9226 }, "end": { "local": "2037-09-23T12:03:17+03:00", "utc": "2037-09-23T09:03:17Z", "ms": 2137309397100.2258 } }, "kaala": "udaya-3", "days": [ { "local_date": "2037-09-22", "window": { "start": { "local": "2037-09-22T06:43:50+03:00", "utc": "2037-09-22T03:43:50Z", "ms": 2137203830139.37 }, "end": { "local": "2037-09-22T09:09:20+03:00", "utc": "2037-09-22T06:09:20Z", "ms": 2137212560331.4746 } }, "covered_min": 0, "window_min": 146, "qualifies": false }, { "local_date": "2037-09-23", "window": { "start": { "local": "2037-09-23T06:44:23+03:00", "utc": "2037-09-23T03:44:23Z", "ms": 2137290262881.674 }, "end": { "local": "2037-09-23T09:09:32+03:00", "utc": "2037-09-23T06:09:32Z", "ms": 2137298971526.3389 } }, "covered_min": 145, "window_min": 145, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 09:35 on Tue 22 Sep to 12:03 on Wed 23 Sep.", "fact": "2037-09-22T06:35:18Z → 2037-09-23T09:03:17Z" }, { "step": "kaala", "text": "The first three muhūrtas after sunrise is first 3 of 15 day muhūrtas: 06:44–09:09 on the 22nd, 06:44–09:10 on the 23rd.", "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 146 minutes on the 22nd and 145 of 145 on the 23rd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103" }, { "step": "tie_break", "text": "Only one morning qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 1557 s" }, { "step": "ruling", "text": "Ananta Caturdaśī, Giza, 2037: Wednesday 23 September.", "fact": "confidence: determinate" } ], "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": "2037-09-23", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-23", "confidence": "determinate" } ], "quote": "In Giza, Ananta Caturdaśī 2037 falls on Wednesday 23 September. Caturdaśī runs from 09:35 on Tue 22 Sep to 12:03 on Wed 23 Sep and covers all of the first three muhūrtas after sunrise that morning.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-09-28", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-28", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1857, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-09-27T21:15:35+03:00", "utc": "2037-09-27T18:15:35Z", "ms": 2137688134630.937 }, "end": { "local": "2037-09-28T23:01:44+03:00", "utc": "2037-09-28T20:01:44Z", "ms": 2137780904395.8237 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-09-27T21:15:35+03:00", "utc": "2037-09-27T18:15:35Z", "ms": 2137688134630.937 }, "end": { "local": "2037-09-28T23:01:44+03:00", "utc": "2037-09-28T20:01:44Z", "ms": 2137780904395.8237 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-09-27", "window": { "start": { "local": "2037-09-27T20:44:38+03:00", "utc": "2037-09-27T17:44:38Z", "ms": 2137686278078.7358 }, "end": { "local": "2037-09-27T20:44:38+03:00", "utc": "2037-09-27T17:44:38Z", "ms": 2137686278078.7358 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-09-28", "window": { "start": { "local": "2037-09-28T21:19:43+03:00", "utc": "2037-09-28T18:19:43Z", "ms": 2137774783358.1204 }, "end": { "local": "2037-09-28T21:19:43+03:00", "utc": "2037-09-28T18:19:43Z", "ms": 2137774783358.1204 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 21:16 on Sun 27 Sep to 23:02 on Mon 28 Sep.", "fact": "2037-09-27T18:15:35Z → 2037-09-28T20:01:44Z" }, { "step": "kaala", "text": "Moonrise is at 20:45 on the 27th and 21:20 on the 28th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 27th and is on the 28th.", "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 1857 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Monday 28 September.", "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": "2037-09-28", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-28", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Monday 28 September. Caturthī runs from 21:16 on Sun 27 Sep to 23:02 on Mon 28 Sep and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-09-28", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/chandra-shashthi", "festival": "chandra-shashthi", "name": "Candra Ṣaṣṭhī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-09-30", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8783, "anga": { "type": "tithi", "index": 20, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-09-30T00:24:41+03:00", "utc": "2037-09-29T21:24:41Z", "ms": 2137872281280.123 }, "end": { "local": "2037-10-01T01:18:01+03:00", "utc": "2037-09-30T22:18:01Z", "ms": 2137961881081.1953 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-09-30T00:24:41+03:00", "utc": "2037-09-29T21:24:41Z", "ms": 2137872281280.123 }, "end": { "local": "2037-10-01T01:18:01+03:00", "utc": "2037-09-30T22:18:01Z", "ms": 2137961881081.1953 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-09-29", "window": { "start": { "local": "2037-09-29T21:58:18+03:00", "utc": "2037-09-29T18:58:18Z", "ms": 2137863498024.9958 }, "end": { "local": "2037-09-29T21:58:18+03:00", "utc": "2037-09-29T18:58:18Z", "ms": 2137863498024.9958 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-09-30", "window": { "start": { "local": "2037-09-30T22:41:24+03:00", "utc": "2037-09-30T19:41:24Z", "ms": 2137952483744.236 }, "end": { "local": "2037-09-30T22:41:24+03:00", "utc": "2037-09-30T19:41:24Z", "ms": 2137952483744.236 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 00:25 on Wed 30 Sep to 01:18 on Thu 1 Oct.", "fact": "2037-09-29T21:24:41Z → 2037-09-30T22:18:01Z" }, { "step": "kaala", "text": "Moonrise is at 21:58 on the 29th and 22:41 on the 30th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Ṣaṣṭhī must be current at moonrise. It is not on the 29th and is on the 30th.", "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 8783 s" }, { "step": "ruling", "text": "Candra Ṣaṣṭhī, Giza, 2037: Wednesday 30 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": "2037-09-30", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-09-30", "confidence": "determinate" } ], "quote": "In Giza, Candra Ṣaṣṭhī 2037 falls on Wednesday 30 September. Ṣaṣṭhī runs from 00:25 on Wed 30 Sep to 01:18 on Thu 1 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/jitashtami", "festival": "jitashtami", "name": "Jitāṣṭamī", "everyday": "Jitiya", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 17756, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-10-02T01:35:33+03:00", "utc": "2037-10-01T22:35:33Z", "ms": 2138049333459.1877 }, "end": { "local": "2037-10-03T01:12:24+03:00", "utc": "2037-10-02T22:12:24Z", "ms": 2138134344404.4531 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-02T01:35:33+03:00", "utc": "2037-10-01T22:35:33Z", "ms": 2138049333459.1877 }, "end": { "local": "2037-10-03T01:12:24+03:00", "utc": "2037-10-02T22:12:24Z", "ms": 2138134344404.4531 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-10-01", "window": { "start": { "local": "2037-10-01T18:40:13+03:00", "utc": "2037-10-01T15:40:13Z", "ms": 2138024413324.6782 }, "end": { "local": "2037-10-01T20:17:27+03:00", "utc": "2037-10-01T17:17:27Z", "ms": 2138030246981.9988 } }, "covered_min": 0, "window_min": 97, "qualifies": false }, { "local_date": "2037-10-02", "window": { "start": { "local": "2037-10-02T18:39:01+03:00", "utc": "2037-10-02T15:39:01Z", "ms": 2138110740570.6768 }, "end": { "local": "2037-10-02T20:16:29+03:00", "utc": "2037-10-02T17:16:29Z", "ms": 2138116588576.139 } }, "covered_min": 97, "window_min": 97, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 01:36 on Fri 2 Oct to 01:12 on Sat 3 Oct.", "fact": "2037-10-01T22:35:33Z → 2037-10-02T22:12:24Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:40–20:17 on the 1st, 18:39–20:16 on the 2nd.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Aṣṭamī must be present during pradoṣa. It covers 0 of 97 minutes on the 1st and 97 of 97 on the 2nd.", "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 17756 s" }, { "step": "ruling", "text": "Jitāṣṭamī, Giza, 2037: Friday 2 October.", "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": "2037-10-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-02", "confidence": "determinate" } ], "quote": "In Giza, Jitāṣṭamī (Jitiya) 2037 falls on Friday 2 October. Aṣṭamī runs from 01:36 on Fri 2 Oct to 01:12 on Sat 3 Oct and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/mahalakshmi-vrata-samapana", "festival": "mahalakshmi-vrata-samapana", "name": "Mahālakṣmī Vrata Samāpana", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-02", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2903, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-10-02T01:35:33+03:00", "utc": "2037-10-01T22:35:33Z", "ms": 2138049333459.1877 }, "end": { "local": "2037-10-03T01:12:24+03:00", "utc": "2037-10-02T22:12:24Z", "ms": 2138134344404.4531 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-02T01:35:33+03:00", "utc": "2037-10-01T22:35:33Z", "ms": 2138049333459.1877 }, "end": { "local": "2037-10-03T01:12:24+03:00", "utc": "2037-10-02T22:12:24Z", "ms": 2138134344404.4531 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-10-01", "window": { "start": { "local": "2037-10-01T23:29:51+03:00", "utc": "2037-10-01T20:29:51Z", "ms": 2138041790528.11 }, "end": { "local": "2037-10-01T23:29:51+03:00", "utc": "2037-10-01T20:29:51Z", "ms": 2138041790528.11 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-10-02", "window": { "start": { "local": "2037-10-03T00:24:01+03:00", "utc": "2037-10-02T21:24:01Z", "ms": 2138131440996.5408 }, "end": { "local": "2037-10-03T00:24:01+03:00", "utc": "2037-10-02T21:24:01Z", "ms": 2138131440996.5408 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 01:36 on Fri 2 Oct to 01:12 on Sat 3 Oct.", "fact": "2037-10-01T22:35:33Z → 2037-10-02T22:12:24Z" }, { "step": "kaala", "text": "Moonrise is at 23:30 on the 1st and 00:24 on the 2nd.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Aṣṭamī must be current at moonrise. It is not on the 1st and is on the 2nd.", "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 2903 s" }, { "step": "ruling", "text": "Mahālakṣmī Vrata Samāpana, Giza, 2037: Friday 2 October.", "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": "2037-10-02", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-02", "confidence": "determinate" } ], "quote": "In Giza, Mahālakṣmī Vrata Samāpana 2037 falls on Friday 2 October. Aṣṭamī runs from 01:36 on Fri 2 Oct to 01:12 on Sat 3 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-10-05", "festival": "ekadashi", "name": "Indirā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30900, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-10-04T22:16:12+03:00", "utc": "2037-10-04T19:16:12Z", "ms": 2138296571629.9736 }, "end": { "local": "2037-10-05T19:46:27+03:00", "utc": "2037-10-05T16:46:27Z", "ms": 2138373986881.2388 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-04T22:16:12+03:00", "utc": "2037-10-04T19:16:12Z", "ms": 2138296571629.9736 }, "end": { "local": "2037-10-05T19:46:27+03:00", "utc": "2037-10-05T16:46:27Z", "ms": 2138373986881.2388 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-10-05", "window": { "start": { "local": "2037-10-05T06:51:11+03:00", "utc": "2037-10-05T03:51:11Z", "ms": 2138327471214.866 }, "end": { "local": "2037-10-05T06:51:11+03:00", "utc": "2037-10-05T03:51:11Z", "ms": 2138327471214.866 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-10-06", "window": { "start": { "local": "2037-10-06T06:51:47+03:00", "utc": "2037-10-06T03:51:47Z", "ms": 2138413906981.1704 }, "end": { "local": "2037-10-06T06:51:47+03:00", "utc": "2037-10-06T03:51:47Z", "ms": 2138413906981.1704 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 22:16 on Sun 4 Oct to 19:46 on Mon 5 Oct.", "fact": "2037-10-04T19:16:12Z → 2037-10-05T16:46:27Z" }, { "step": "kaala", "text": "Sunrise is at 06:51 on the 5th and 06:52 on the 6th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 5th and is not on the 6th.", "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 30900 s" }, { "step": "ruling", "text": "Indirā Ekādaśī, Giza, 2037: Monday 5 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": "2037-10-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-05", "confidence": "determinate" } ], "quote": "In Giza, Indirā Ekādaśī 2037 falls on Monday 5 October. Ekādaśī runs from 22:16 on Sun 4 Oct to 19:46 on Mon 5 Oct and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-10-05", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-10-06", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6702, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-10-06T16:42:32+03:00", "utc": "2037-10-06T13:42:32Z", "ms": 2138449351985.1414 }, "end": { "local": "2037-10-07T13:12:33+03:00", "utc": "2037-10-07T10:12:33Z", "ms": 2138523153342.264 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-06T16:42:32+03:00", "utc": "2037-10-06T13:42:32Z", "ms": 2138449351985.1414 }, "end": { "local": "2037-10-07T13:12:33+03:00", "utc": "2037-10-07T10:12:33Z", "ms": 2138523153342.264 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-10-06", "window": { "start": { "local": "2037-10-06T18:34:14+03:00", "utc": "2037-10-06T15:34:14Z", "ms": 2138456053795.487 }, "end": { "local": "2037-10-06T20:12:39+03:00", "utc": "2037-10-06T17:12:39Z", "ms": 2138461959031.8264 } }, "covered_min": 98, "window_min": 98, "qualifies": true }, { "local_date": "2037-10-07", "window": { "start": { "local": "2037-10-07T18:33:03+03:00", "utc": "2037-10-07T15:33:03Z", "ms": 2138542383297.4736 }, "end": { "local": "2037-10-07T20:11:43+03:00", "utc": "2037-10-07T17:11:43Z", "ms": 2138548302788.6885 } }, "covered_min": 0, "window_min": 99, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 16:43 on Tue 6 Oct to 13:13 on Wed 7 Oct.", "fact": "2037-10-06T13:42:32Z → 2037-10-07T10:12:33Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:34–20:13 on the 6th, 18:33–20:12 on the 7th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Trayodaśī must be present during pradoṣa. It covers 98 of 98 minutes on the 6th and 0 of 99 on the 7th.", "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 6702 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Tuesday 6 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": "2037-10-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-06", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Tuesday 6 October. Trayodaśī runs from 16:43 on Tue 6 Oct to 13:13 on Wed 7 Oct and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-10-06", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-10-07", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 29955, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-10-07T13:12:33+03:00", "utc": "2037-10-07T10:12:33Z", "ms": 2138523153342.264 }, "end": { "local": "2037-10-08T09:26:17+03:00", "utc": "2037-10-08T06:26:17Z", "ms": 2138595976884.7715 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-07T13:12:33+03:00", "utc": "2037-10-07T10:12:33Z", "ms": 2138523153342.264 }, "end": { "local": "2037-10-08T09:26:17+03:00", "utc": "2037-10-08T06:26:17Z", "ms": 2138595976884.7715 } }, "kaala": "nishita", "days": [ { "local_date": "2037-10-06", "window": { "start": { "local": "2037-10-07T00:19:18+03:00", "utc": "2037-10-06T21:19:18Z", "ms": 2138476758431.7598 }, "end": { "local": "2037-10-07T01:07:18+03:00", "utc": "2037-10-06T22:07:18Z", "ms": 2138479638431.7598 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-10-07", "window": { "start": { "local": "2037-10-08T00:19:01+03:00", "utc": "2037-10-07T21:19:01Z", "ms": 2138563141389.5288 }, "end": { "local": "2037-10-08T01:07:01+03:00", "utc": "2037-10-07T22:07:01Z", "ms": 2138566021389.5288 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 13:13 on Wed 7 Oct to 09:26 on Thu 8 Oct.", "fact": "2037-10-07T10:12:33Z → 2037-10-08T06:26:17Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 00:19–01:07 on the 6th, 00:19–01:07 on the 7th.", "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 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 night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 29955 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Wednesday 7 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": "2037-10-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-07", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Wednesday 7 October. Caturdaśī runs from 13:13 on Wed 7 Oct to 09:26 on Thu 8 Oct and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-10-07", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/mahalaya-amavasya", "festival": "mahalaya-amavasya", "name": "Mahālaya Amāvāsyā", "everyday": "Sarvapitṛ Amāvāsyā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15963, "anga": { "type": "tithi", "index": 29, "key": "amavasya", "name": "Amāvasyā", "start": { "local": "2037-10-08T09:26:17+03:00", "utc": "2037-10-08T06:26:17Z", "ms": 2138595976884.7715 }, "end": { "local": "2037-10-09T05:34:35+03:00", "utc": "2037-10-09T02:34:35Z", "ms": 2138668474796.7915 }, "month": { "amanta": 5, "purnimanta": 6, "adhika": false, "amanta_name": "Bhādrapada", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-08T09:26:17+03:00", "utc": "2037-10-08T06:26:17Z", "ms": 2138595976884.7715 }, "end": { "local": "2037-10-09T05:34:35+03:00", "utc": "2037-10-09T02:34:35Z", "ms": 2138668474796.7915 } }, "kaala": "aparahna", "days": [ { "local_date": "2037-10-08", "window": { "start": { "local": "2037-10-08T13:52:20+03:00", "utc": "2037-10-08T10:52:20Z", "ms": 2138611939789.951 }, "end": { "local": "2037-10-08T16:12:07+03:00", "utc": "2037-10-08T13:12:07Z", "ms": 2138620326559.4065 } }, "covered_min": 140, "window_min": 140, "qualifies": true }, { "local_date": "2037-10-09", "window": { "start": { "local": "2037-10-09T13:51:53+03:00", "utc": "2037-10-09T10:51:53Z", "ms": 2138698312839.0217 }, "end": { "local": "2037-10-09T16:11:18+03:00", "utc": "2037-10-09T13:11:18Z", "ms": 2138706678376.4749 } }, "covered_min": 0, "window_min": 139, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Amāvasyā runs from 09:26 on Thu 8 Oct to 05:35 on Fri 9 Oct.", "fact": "2037-10-08T06:26:17Z → 2037-10-09T02:34:35Z" }, { "step": "kaala", "text": "Aparāhṇa is 10th to 12th of 15 day muhūrtas: 13:52–16:12 on the 8th, 13:52–16:11 on the 9th.", "fact": "aparahna: day-muhurta-10-12 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Amāvasyā must be present during aparāhṇa. It covers 140 of 140 minutes on the 8th and 0 of 139 on the 9th.", "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 15963 s" }, { "step": "ruling", "text": "Mahālaya Amāvāsyā, Giza, 2037: Thursday 8 October.", "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": "2037-10-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-08", "confidence": "determinate" } ], "quote": "In Giza, Mahālaya Amāvāsyā 2037 falls on Thursday 8 October. Amāvasyā runs from 09:26 on Thu 8 Oct to 05:35 on Fri 9 Oct and covers all of aparāhṇa that afternoon.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/navaratra-arambha", "festival": "navaratra-arambha", "name": "Navarātrārambha", "everyday": "Navratri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-09", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 24215, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-10-09T05:34:35+03:00", "utc": "2037-10-09T02:34:35Z", "ms": 2138668474796.7915 }, "end": { "local": "2037-10-10T01:48:55+03:00", "utc": "2037-10-09T22:48:55Z", "ms": 2138741334836.843 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-09T05:34:35+03:00", "utc": "2037-10-09T02:34:35Z", "ms": 2138668474796.7915 }, "end": { "local": "2037-10-10T01:48:55+03:00", "utc": "2037-10-09T22:48:55Z", "ms": 2138741334836.843 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-10-09", "window": { "start": { "local": "2037-10-09T12:18:10+03:00", "utc": "2037-10-09T09:18:10Z", "ms": 2138692690070.2954 }, "end": { "local": "2037-10-09T13:06:10+03:00", "utc": "2037-10-09T10:06:10Z", "ms": 2138695570070.2954 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-10-10", "window": { "start": { "local": "2037-10-10T12:17:54+03:00", "utc": "2037-10-10T09:17:54Z", "ms": 2138779074192.0435 }, "end": { "local": "2037-10-10T13:05:54+03:00", "utc": "2037-10-10T10:05:54Z", "ms": 2138781954192.0435 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 05:35 on Fri 9 Oct to 01:49 on Sat 10 Oct.", "fact": "2037-10-09T02:34:35Z → 2037-10-09T22:48:55Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:18–13:06 on the 9th, 12:18–13:06 on the 10th.", "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 9th and 0 of 48 on the 10th.", "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 24215 s" }, { "step": "ruling", "text": "Navarātrārambha, Giza, 2037: Friday 9 October.", "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": "2037-10-09", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-09", "confidence": "determinate" } ], "quote": "In Giza, Navarātrārambha (Navratri) 2037 falls on Friday 9 October. Pratipadā runs from 05:35 on Fri 9 Oct to 01:49 on Sat 10 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-10-12", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 14112, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-10-11T19:21:26+03:00", "utc": "2037-10-11T16:21:26Z", "ms": 2138890885515.5317 }, "end": { "local": "2037-10-12T17:00:35+03:00", "utc": "2037-10-12T14:00:35Z", "ms": 2138968835447.0808 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-11T19:21:26+03:00", "utc": "2037-10-11T16:21:26Z", "ms": 2138890885515.5317 }, "end": { "local": "2037-10-12T17:00:35+03:00", "utc": "2037-10-12T14:00:35Z", "ms": 2138968835447.0808 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-10-11", "window": { "start": { "local": "2037-10-11T12:17:39+03:00", "utc": "2037-10-11T09:17:39Z", "ms": 2138865458784.579 }, "end": { "local": "2037-10-11T13:05:39+03:00", "utc": "2037-10-11T10:05:39Z", "ms": 2138868338784.579 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-10-12", "window": { "start": { "local": "2037-10-12T12:17:24+03:00", "utc": "2037-10-12T09:17:24Z", "ms": 2138951843862.4988 }, "end": { "local": "2037-10-12T13:05:24+03:00", "utc": "2037-10-12T10:05:24Z", "ms": 2138954723862.4988 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 19:21 on Sun 11 Oct to 17:01 on Mon 12 Oct.", "fact": "2037-10-11T16:21:26Z → 2037-10-12T14:00:35Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:18–13:06 on the 11th, 12:17–13:05 on the 12th.", "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 11th and 48 of 48 on the 12th.", "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 14112 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Monday 12 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": "2037-10-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-12", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Monday 12 October. Caturthī runs from 19:21 on Sun 11 Oct to 17:01 on Mon 12 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-10-12", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/durga-saptami", "festival": "durga-saptami", "name": "Durgā Saptamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 25230, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-10-14T14:43:08+03:00", "utc": "2037-10-14T11:43:08Z", "ms": 2139133388009.6448 }, "end": { "local": "2037-10-15T14:52:18+03:00", "utc": "2037-10-15T11:52:18Z", "ms": 2139220338222.2905 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-14T14:43:08+03:00", "utc": "2037-10-14T11:43:08Z", "ms": 2139133388009.6448 }, "end": { "local": "2037-10-15T14:52:18+03:00", "utc": "2037-10-15T11:52:18Z", "ms": 2139220338222.2905 } }, "kaala": "udaya-1", "days": [ { "local_date": "2037-10-14", "window": { "start": { "local": "2037-10-14T06:56:45+03:00", "utc": "2037-10-14T03:56:45Z", "ms": 2139105405054.9988 }, "end": { "local": "2037-10-14T07:42:38+03:00", "utc": "2037-10-14T04:42:38Z", "ms": 2139108158452.564 } }, "covered_min": 0, "window_min": 46, "qualifies": false }, { "local_date": "2037-10-15", "window": { "start": { "local": "2037-10-15T06:57:24+03:00", "utc": "2037-10-15T03:57:24Z", "ms": 2139191843869.526 }, "end": { "local": "2037-10-15T07:43:10+03:00", "utc": "2037-10-15T04:43:10Z", "ms": 2139194590309.082 } }, "covered_min": 46, "window_min": 46, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 14:43 on Wed 14 Oct to 14:52 on Thu 15 Oct.", "fact": "2037-10-14T11:43:08Z → 2037-10-15T11:52:18Z" }, { "step": "kaala", "text": "The first muhūrta after sunrise is 1st of 15 day muhūrtas: 06:57–07:43 on the 14th, 06:57–07:43 on the 15th.", "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 0 of 46 minutes on the 14th and 46 of 46 on the 15th.", "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 25230 s" }, { "step": "ruling", "text": "Durgā Saptamī, Giza, 2037: Thursday 15 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": "2037-10-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-15", "confidence": "determinate" } ], "quote": "In Giza, Durgā Saptamī 2037 falls on Thursday 15 October. Saptamī runs from 14:43 on Wed 14 Oct to 14:52 on Thu 15 Oct and covers all of the first muhūrta after sunrise that morning.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/mahashtami", "festival": "mahashtami", "name": "Mahāṣṭamī", "everyday": "Durga Ashtami", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-16", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 6456, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-10-15T14:52:18+03:00", "utc": "2037-10-15T11:52:18Z", "ms": 2139220338222.2905 }, "end": { "local": "2037-10-16T15:50:13+03:00", "utc": "2037-10-16T12:50:13Z", "ms": 2139310212503.5938 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-15T14:52:18+03:00", "utc": "2037-10-15T11:52:18Z", "ms": 2139220338222.2905 }, "end": { "local": "2037-10-16T15:50:13+03:00", "utc": "2037-10-16T12:50:13Z", "ms": 2139310212503.5938 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-10-15", "window": { "start": { "local": "2037-10-15T12:16:42+03:00", "utc": "2037-10-15T09:16:42Z", "ms": 2139211002166.1963 }, "end": { "local": "2037-10-15T13:04:42+03:00", "utc": "2037-10-15T10:04:42Z", "ms": 2139213882166.1963 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-10-16", "window": { "start": { "local": "2037-10-16T12:16:29+03:00", "utc": "2037-10-16T09:16:29Z", "ms": 2139297389347.0796 }, "end": { "local": "2037-10-16T13:04:29+03:00", "utc": "2037-10-16T10:04:29Z", "ms": 2139300269347.0796 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 14:52 on Thu 15 Oct to 15:50 on Fri 16 Oct.", "fact": "2037-10-15T11:52:18Z → 2037-10-16T12:50:13Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:17–13:05 on the 15th, 12:16–13:04 on the 16th.", "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 15th and 48 of 48 on the 16th.", "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 6456 s" }, { "step": "ruling", "text": "Mahāṣṭamī, Giza, 2037: Friday 16 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": "2037-10-16", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-16", "confidence": "determinate" } ], "quote": "In Giza, Mahāṣṭamī (Durga Ashtami) 2037 falls on Friday 16 October. Aṣṭamī runs from 14:52 on Thu 15 Oct to 15:50 on Fri 16 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vijaya-dashami", "festival": "vijaya-dashami", "name": "Vijayā Daśamī", "everyday": "Dussehra", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 3165, "anga": { "type": "tithi", "index": 9, "key": "dashami", "name": "Daśamī", "start": { "local": "2037-10-17T17:29:07+03:00", "utc": "2037-10-17T14:29:07Z", "ms": 2139402546781.4683 }, "end": { "local": "2037-10-18T19:38:10+03:00", "utc": "2037-10-18T16:38:10Z", "ms": 2139496690261.8943 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "conjunction", "start": { "local": "2037-10-17T17:29:07+03:00", "utc": "2037-10-17T14:29:07Z", "ms": 2139402546781.4683 }, "end": { "local": "2037-10-18T03:44:19+03:00", "utc": "2037-10-18T00:44:19Z", "ms": 2139439458828.4539 }, "nakshatra": { "type": "nakshatra", "index": 21, "key": "shravana", "name": "Śravaṇa", "start": { "local": "2037-10-17T01:21:06+03:00", "utc": "2037-10-16T22:21:06Z", "ms": 2139344465601.661 }, "end": { "local": "2037-10-18T03:44:19+03:00", "utc": "2037-10-18T00:44:19Z", "ms": 2139439458828.4539 } } }, "kaala": "daytime", "days": [ { "local_date": "2037-10-17", "window": { "start": { "local": "2037-10-17T06:58:43+03:00", "utc": "2037-10-17T03:58:43Z", "ms": 2139364722589.44 }, "end": { "local": "2037-10-17T18:21:52+03:00", "utc": "2037-10-17T15:21:52Z", "ms": 2139405711605.263 } }, "covered_min": 53, "window_min": 683, "qualifies": true }, { "local_date": "2037-10-18", "window": { "start": { "local": "2037-10-18T06:59:23+03:00", "utc": "2037-10-18T03:59:23Z", "ms": 2139451162507.2012 }, "end": { "local": "2037-10-18T18:20:48+03:00", "utc": "2037-10-18T15:20:48Z", "ms": 2139492048363.2456 } }, "covered_min": 0, "window_min": 681, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Daśamī runs from 17:29 on Sat 17 Oct to 19:38 on Sun 18 Oct, and Śravaṇa from 01:21 on Sat 17 Oct to 03:44 on Sun 18 Oct. They are together from 17:29 on Sat 17 Oct to 03:44 on Sun 18 Oct.", "fact": "2037-10-17T14:29:07Z → 2037-10-18T00:44:19Z" }, { "step": "kaala", "text": "The day time is sunrise to sunset: 06:59–18:22 on the 17th, 06:59–18:21 on the 18th.", "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 53 of 683 minutes on the 17th and 0 of 681 on the 18th.", "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 3165 s" }, { "step": "ruling", "text": "Vijayā Daśamī, Giza, 2037: Saturday 17 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": "2037-10-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-17", "confidence": "determinate" } ], "quote": "In Giza, Vijayā Daśamī (Dussehra) 2037 falls on Saturday 17 October. Daśamī runs from 17:29 on Sat 17 Oct to 19:38 on Sun 18 Oct and is with Śravaṇa in the day time that day, for 53 minutes.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/mahanavami", "festival": "mahanavami", "name": "Mahānavamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-17", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 9943, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "2037-10-16T15:50:13+03:00", "utc": "2037-10-16T12:50:13Z", "ms": 2139310212503.5938 }, "end": { "local": "2037-10-17T17:29:07+03:00", "utc": "2037-10-17T14:29:07Z", "ms": 2139402546781.4683 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-16T15:50:13+03:00", "utc": "2037-10-16T12:50:13Z", "ms": 2139310212503.5938 }, "end": { "local": "2037-10-17T17:29:07+03:00", "utc": "2037-10-17T14:29:07Z", "ms": 2139402546781.4683 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-10-16", "window": { "start": { "local": "2037-10-16T12:16:29+03:00", "utc": "2037-10-16T09:16:29Z", "ms": 2139297389347.0796 }, "end": { "local": "2037-10-16T13:04:29+03:00", "utc": "2037-10-16T10:04:29Z", "ms": 2139300269347.0796 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-10-17", "window": { "start": { "local": "2037-10-17T12:16:17+03:00", "utc": "2037-10-17T09:16:17Z", "ms": 2139383777097.3516 }, "end": { "local": "2037-10-17T13:04:17+03:00", "utc": "2037-10-17T10:04:17Z", "ms": 2139386657097.3516 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Navamī runs from 15:50 on Fri 16 Oct to 17:29 on Sat 17 Oct.", "fact": "2037-10-16T12:50:13Z → 2037-10-17T14:29:07Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 12:16–13:04 on the 16th, 12:16–13:04 on the 17th.", "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 16th and 48 of 48 on the 17th.", "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 9943 s" }, { "step": "ruling", "text": "Mahānavamī, Giza, 2037: Saturday 17 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": "2037-10-17", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-17", "confidence": "determinate" } ], "quote": "In Giza, Mahānavamī 2037 falls on Saturday 17 October. Navamī runs from 15:50 on Fri 16 Oct to 17:29 on Sat 17 Oct and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-10-19", "festival": "ekadashi", "name": "Pāśāṅkuśā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 32130, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-10-18T19:38:10+03:00", "utc": "2037-10-18T16:38:10Z", "ms": 2139496690261.8943 }, "end": { "local": "2037-10-19T22:05:13+03:00", "utc": "2037-10-19T19:05:13Z", "ms": 2139591913254.2046 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-18T19:38:10+03:00", "utc": "2037-10-18T16:38:10Z", "ms": 2139496690261.8943 }, "end": { "local": "2037-10-19T22:05:13+03:00", "utc": "2037-10-19T19:05:13Z", "ms": 2139591913254.2046 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-10-19", "window": { "start": { "local": "2037-10-19T07:00:03+03:00", "utc": "2037-10-19T04:00:03Z", "ms": 2139537602805.176 }, "end": { "local": "2037-10-19T07:00:03+03:00", "utc": "2037-10-19T04:00:03Z", "ms": 2139537602805.176 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-10-20", "window": { "start": { "local": "2037-10-20T07:00:43+03:00", "utc": "2037-10-20T04:00:43Z", "ms": 2139624043489.4734 }, "end": { "local": "2037-10-20T07:00:43+03:00", "utc": "2037-10-20T04:00:43Z", "ms": 2139624043489.4734 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 19:38 on Sun 18 Oct to 22:05 on Mon 19 Oct.", "fact": "2037-10-18T16:38:10Z → 2037-10-19T19:05:13Z" }, { "step": "kaala", "text": "Sunrise is at 07:00 on the 19th and 07:01 on the 20th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is on the 19th and is not on the 20th.", "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 32130 s" }, { "step": "ruling", "text": "Pāśāṅkuśā Ekādaśī, Giza, 2037: Monday 19 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": "2037-10-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-19", "confidence": "determinate" } ], "quote": "In Giza, Pāśāṅkuśā Ekādaśī 2037 falls on Monday 19 October. Ekādaśī runs from 19:38 on Sun 18 Oct to 22:05 on Mon 19 Oct and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-10-19", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-10-21", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16697, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-10-21T00:38:43+03:00", "utc": "2037-10-20T21:38:43Z", "ms": 2139687523140.5217 }, "end": { "local": "2037-10-22T03:09:12+03:00", "utc": "2037-10-22T00:09:12Z", "ms": 2139782951956.2473 }, "month": { "amanta": 6, "purnimanta": 6, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Āśvina" } }, "span": { "of": "tithi", "start": { "local": "2037-10-21T00:38:43+03:00", "utc": "2037-10-20T21:38:43Z", "ms": 2139687523140.5217 }, "end": { "local": "2037-10-22T03:09:12+03:00", "utc": "2037-10-22T00:09:12Z", "ms": 2139782951956.2473 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-10-20", "window": { "start": { "local": "2037-10-20T18:18:44+03:00", "utc": "2037-10-20T15:18:44Z", "ms": 2139664724404.7 }, "end": { "local": "2037-10-20T20:00:26+03:00", "utc": "2037-10-20T17:00:26Z", "ms": 2139670825759.5337 } }, "covered_min": 0, "window_min": 102, "qualifies": false }, { "local_date": "2037-10-21", "window": { "start": { "local": "2037-10-21T18:17:44+03:00", "utc": "2037-10-21T15:17:44Z", "ms": 2139751063749.4487 }, "end": { "local": "2037-10-21T19:59:39+03:00", "utc": "2037-10-21T16:59:39Z", "ms": 2139757178721.541 } }, "covered_min": 102, "window_min": 102, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 00:39 on Wed 21 Oct to 03:09 on Thu 22 Oct.", "fact": "2037-10-20T21:38:43Z → 2037-10-22T00:09:12Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 18:19–20:00 on the 20th, 18:18–20:00 on the 21st.", "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 102 minutes on the 20th and 102 of 102 on the 21st.", "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 16697 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Wednesday 21 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": "2037-10-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-21", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Wednesday 21 October. Trayodaśī runs from 00:39 on Wed 21 Oct to 03:09 on Thu 22 Oct and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-10-21", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/karaka-chaturthi", "festival": "karaka-chaturthi", "name": "Karaka Caturthī", "everyday": "Karwa Chauth", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30373, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-10-27T12:10:32+03:00", "utc": "2037-10-27T09:10:32Z", "ms": 2140247432100.778 }, "end": { "local": "2037-10-28T12:59:53+03:00", "utc": "2037-10-28T09:59:53Z", "ms": 2140336793171.0771 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-10-27T12:10:32+03:00", "utc": "2037-10-27T09:10:32Z", "ms": 2140247432100.778 }, "end": { "local": "2037-10-28T12:59:53+03:00", "utc": "2037-10-28T09:59:53Z", "ms": 2140336793171.0771 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-10-27", "window": { "start": { "local": "2037-10-27T20:39:36+03:00", "utc": "2037-10-27T17:39:36Z", "ms": 2140277976015.0918 }, "end": { "local": "2037-10-27T20:39:36+03:00", "utc": "2037-10-27T17:39:36Z", "ms": 2140277976015.0918 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-10-28", "window": { "start": { "local": "2037-10-28T21:26:06+03:00", "utc": "2037-10-28T18:26:06Z", "ms": 2140367165862.8315 }, "end": { "local": "2037-10-28T21:26:06+03:00", "utc": "2037-10-28T18:26:06Z", "ms": 2140367165862.8315 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 12:11 on Tue 27 Oct to 13:00 on Wed 28 Oct.", "fact": "2037-10-27T09:10:32Z → 2037-10-28T09:59:53Z" }, { "step": "kaala", "text": "Moonrise is at 20:40 on the 27th and 21:26 on the 28th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 27th and is not on the 28th.", "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 30373 s" }, { "step": "ruling", "text": "Karaka Caturthī, Giza, 2037: Tuesday 27 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": "2037-10-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-27", "confidence": "determinate" } ], "quote": "In Giza, Karaka Caturthī (Karwa Chauth) 2037 falls on Tuesday 27 October. Caturthī runs from 12:11 on Tue 27 Oct to 13:00 on Wed 28 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-10-27", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-27", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 30373, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-10-27T12:10:32+03:00", "utc": "2037-10-27T09:10:32Z", "ms": 2140247432100.778 }, "end": { "local": "2037-10-28T12:59:53+03:00", "utc": "2037-10-28T09:59:53Z", "ms": 2140336793171.0771 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-10-27T12:10:32+03:00", "utc": "2037-10-27T09:10:32Z", "ms": 2140247432100.778 }, "end": { "local": "2037-10-28T12:59:53+03:00", "utc": "2037-10-28T09:59:53Z", "ms": 2140336793171.0771 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-10-27", "window": { "start": { "local": "2037-10-27T20:39:36+03:00", "utc": "2037-10-27T17:39:36Z", "ms": 2140277976015.0918 }, "end": { "local": "2037-10-27T20:39:36+03:00", "utc": "2037-10-27T17:39:36Z", "ms": 2140277976015.0918 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-10-28", "window": { "start": { "local": "2037-10-28T21:26:06+03:00", "utc": "2037-10-28T18:26:06Z", "ms": 2140367165862.8315 }, "end": { "local": "2037-10-28T21:26:06+03:00", "utc": "2037-10-28T18:26:06Z", "ms": 2140367165862.8315 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 12:11 on Tue 27 Oct to 13:00 on Wed 28 Oct.", "fact": "2037-10-27T09:10:32Z → 2037-10-28T09:59:53Z" }, { "step": "kaala", "text": "Moonrise is at 20:40 on the 27th and 21:26 on the 28th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 27th and is not on the 28th.", "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 30373 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Tuesday 27 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": "2037-10-27", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-27", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Tuesday 27 October. Caturthī runs from 12:11 on Tue 27 Oct to 13:00 on Wed 28 Oct and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-10-27", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ahoyi-ashtami", "festival": "ahoyi-ashtami", "name": "Ahoyī Aṣṭamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-10-31", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 40213, "anga": { "type": "tithi", "index": 22, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-10-31T11:38:57+02:00", "utc": "2037-10-31T09:38:57Z", "ms": 2140594737350.2683 }, "end": { "local": "2037-11-01T10:25:25+02:00", "utc": "2037-11-01T08:25:25Z", "ms": 2140676724946.7095 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-10-31T11:38:57+02:00", "utc": "2037-10-31T09:38:57Z", "ms": 2140594737350.2683 }, "end": { "local": "2037-11-01T10:25:25+02:00", "utc": "2037-11-01T08:25:25Z", "ms": 2140676724946.7095 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-10-30", "window": { "start": { "local": "2037-10-30T22:14:28+02:00", "utc": "2037-10-30T20:14:28Z", "ms": 2140546468484.2595 }, "end": { "local": "2037-10-30T22:14:28+02:00", "utc": "2037-10-30T20:14:28Z", "ms": 2140546468484.2595 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-10-31", "window": { "start": { "local": "2037-10-31T23:15:12+02:00", "utc": "2037-10-31T21:15:12Z", "ms": 2140636512328.62 }, "end": { "local": "2037-10-31T23:15:12+02:00", "utc": "2037-10-31T21:15:12Z", "ms": 2140636512328.62 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 11:39 on Sat 31 Oct to 10:25 on Sun 1 Nov.", "fact": "2037-10-31T09:38:57Z → 2037-11-01T08:25:25Z" }, { "step": "kaala", "text": "Moonrise is at 22:14 on the 30th and 23:15 on the 31st.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Aṣṭamī must be current at moonrise. It is not on the 30th and is on the 31st.", "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 40213 s" }, { "step": "ruling", "text": "Ahoyī Aṣṭamī, Giza, 2037: Saturday 31 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": "2037-10-31", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-10-31", "confidence": "determinate" } ], "quote": "In Giza, Ahoyī Aṣṭamī 2037 falls on Saturday 31 October. Aṣṭamī runs from 11:39 on Sat 31 Oct to 10:25 on Sun 1 Nov and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-11-03", "festival": "ekadashi", "name": "Ramā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-03", "confidence": "boundary", "boundary_reasons": [ "margin" ], "boundary_margin_s": 259, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-11-03T06:15:15+02:00", "utc": "2037-11-03T04:15:15Z", "ms": 2140834514652.8245 }, "end": { "local": "2037-11-04T03:25:25+02:00", "utc": "2037-11-04T01:25:25Z", "ms": 2140910725219.271 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-03T06:15:15+02:00", "utc": "2037-11-03T04:15:15Z", "ms": 2140834514652.8245 }, "end": { "local": "2037-11-04T03:25:25+02:00", "utc": "2037-11-04T01:25:25Z", "ms": 2140910725219.271 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-11-03", "window": { "start": { "local": "2037-11-03T06:10:56+02:00", "utc": "2037-11-03T04:10:56Z", "ms": 2140834255770.6174 }, "end": { "local": "2037-11-03T06:10:56+02:00", "utc": "2037-11-03T04:10:56Z", "ms": 2140834255770.6174 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-11-04", "window": { "start": { "local": "2037-11-04T06:11:43+02:00", "utc": "2037-11-04T04:11:43Z", "ms": 2140920702527.8875 }, "end": { "local": "2037-11-04T06:11:43+02:00", "utc": "2037-11-04T04:11:43Z", "ms": 2140920702527.8875 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "tithi-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 06:15 on Tue 3 Nov to 03:25 on Wed 4 Nov.", "fact": "2037-11-03T04:15:15Z → 2037-11-04T01:25:25Z" }, { "step": "kaala", "text": "Sunrise is at 06:11 on the 3rd and 06:12 on the 4th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 3rd and is not on the 4th.", "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 259 s < 300 s" }, { "step": "ruling", "text": "Ramā Ekādaśī, Giza, 2037: Tuesday 3 November.", "fact": "confidence: boundary (margin)" } ], "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": "2037-11-03", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-03", "confidence": "boundary" } ], "quote": "In Giza, Ramā Ekādaśī 2037 falls on Tuesday 3 November. Ekādaśī runs from 06:15 on Tue 3 Nov to 03:25 on Wed 4 Nov, and is current at sunrise on neither day. It is 4 min 19 s from a threshold: treat the date as contested.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-11-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/govatsa-dvadashi", "festival": "govatsa-dvadashi", "name": "Govatsa Dvādaśī", "everyday": "Vasu Baras", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 19426, "anga": { "type": "tithi", "index": 26, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-11-04T03:25:25+02:00", "utc": "2037-11-04T01:25:25Z", "ms": 2140910725219.271 }, "end": { "local": "2037-11-05T00:14:08+02:00", "utc": "2037-11-04T22:14:08Z", "ms": 2140985647561.7163 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-04T03:25:25+02:00", "utc": "2037-11-04T01:25:25Z", "ms": 2140910725219.271 }, "end": { "local": "2037-11-05T00:14:08+02:00", "utc": "2037-11-04T22:14:08Z", "ms": 2140985647561.7163 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-11-03", "window": { "start": { "local": "2037-11-03T17:06:10+02:00", "utc": "2037-11-03T15:06:10Z", "ms": 2140873570405.804 }, "end": { "local": "2037-11-03T18:50:55+02:00", "utc": "2037-11-03T16:50:55Z", "ms": 2140879854688.7485 } }, "covered_min": 0, "window_min": 105, "qualifies": false }, { "local_date": "2037-11-04", "window": { "start": { "local": "2037-11-04T17:05:25+02:00", "utc": "2037-11-04T15:05:25Z", "ms": 2140959925424.905 }, "end": { "local": "2037-11-04T18:50:22+02:00", "utc": "2037-11-04T16:50:22Z", "ms": 2140966221987.7979 } }, "covered_min": 105, "window_min": 105, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 03:25 on Wed 4 Nov to 00:14 on Thu 5 Nov.", "fact": "2037-11-04T01:25:25Z → 2037-11-04T22:14:08Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:06–18:51 on the 3rd, 17:05–18:50 on the 4th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Dvādaśī must be present during pradoṣa. It covers 0 of 105 minutes on the 3rd and 105 of 105 on the 4th.", "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: purvaviddha → only-day · margin 19426 s" }, { "step": "ruling", "text": "Govatsa Dvādaśī, Giza, 2037: Wednesday 4 November.", "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": "2037-11-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-04", "confidence": "determinate" } ], "quote": "In Giza, Govatsa Dvādaśī (Vasu Baras) 2037 falls on Wednesday 4 November. Dvādaśī runs from 03:25 on Wed 4 Nov to 00:14 on Thu 5 Nov and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/yama-dipadana", "festival": "yama-dipadana", "name": "Yama Dīpadāna", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7206, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-11-05T00:14:08+02:00", "utc": "2037-11-04T22:14:08Z", "ms": 2140985647561.7163 }, "end": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-05T00:14:08+02:00", "utc": "2037-11-04T22:14:08Z", "ms": 2140985647561.7163 }, "end": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-11-04", "window": { "start": { "local": "2037-11-04T17:05:25+02:00", "utc": "2037-11-04T15:05:25Z", "ms": 2140959925424.905 }, "end": { "local": "2037-11-04T18:50:22+02:00", "utc": "2037-11-04T16:50:22Z", "ms": 2140966221987.7979 } }, "covered_min": 0, "window_min": 105, "qualifies": false }, { "local_date": "2037-11-05", "window": { "start": { "local": "2037-11-05T17:04:42+02:00", "utc": "2037-11-05T15:04:42Z", "ms": 2141046281770.8767 }, "end": { "local": "2037-11-05T18:49:50+02:00", "utc": "2037-11-05T16:49:50Z", "ms": 2141052590482.6934 } }, "covered_min": 105, "window_min": 105, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 00:14 on Thu 5 Nov to 20:50 on Thu 5 Nov.", "fact": "2037-11-04T22:14:08Z → 2037-11-05T18:49:57Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:05–18:50 on the 4th, 17:05–18:50 on the 5th.", "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 105 minutes on the 4th and 105 of 105 on the 5th.", "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 7206 s" }, { "step": "ruling", "text": "Yama Dīpadāna, Giza, 2037: Thursday 5 November.", "fact": "confidence: determinate" } ], "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": "2037-11-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-05", "confidence": "determinate" } ], "quote": "In Giza, Yama Dīpadāna 2037 falls on Thursday 5 November. Trayodaśī runs from 00:14 on Thu 5 Nov to 20:50 on Thu 5 Nov and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-11-05", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 7206, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-11-05T00:14:08+02:00", "utc": "2037-11-04T22:14:08Z", "ms": 2140985647561.7163 }, "end": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-05T00:14:08+02:00", "utc": "2037-11-04T22:14:08Z", "ms": 2140985647561.7163 }, "end": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-11-04", "window": { "start": { "local": "2037-11-04T17:05:25+02:00", "utc": "2037-11-04T15:05:25Z", "ms": 2140959925424.905 }, "end": { "local": "2037-11-04T18:50:22+02:00", "utc": "2037-11-04T16:50:22Z", "ms": 2140966221987.7979 } }, "covered_min": 0, "window_min": 105, "qualifies": false }, { "local_date": "2037-11-05", "window": { "start": { "local": "2037-11-05T17:04:42+02:00", "utc": "2037-11-05T15:04:42Z", "ms": 2141046281770.8767 }, "end": { "local": "2037-11-05T18:49:50+02:00", "utc": "2037-11-05T16:49:50Z", "ms": 2141052590482.6934 } }, "covered_min": 105, "window_min": 105, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 00:14 on Thu 5 Nov to 20:50 on Thu 5 Nov.", "fact": "2037-11-04T22:14:08Z → 2037-11-05T18:49:57Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:05–18:50 on the 4th, 17:05–18:50 on the 5th.", "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 105 minutes on the 4th and 105 of 105 on the 5th.", "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 7206 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Thursday 5 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": "2037-11-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-05", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Thursday 5 November. Trayodaśī runs from 00:14 on Thu 5 Nov to 20:50 on Thu 5 Nov and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-11-05", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-11-05", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8703, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 }, "end": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 }, "end": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 } }, "kaala": "nishita", "days": [ { "local_date": "2037-11-05", "window": { "start": { "local": "2037-11-05T23:14:59+02:00", "utc": "2037-11-05T21:14:59Z", "ms": 2141068499440.1895 }, "end": { "local": "2037-11-06T00:02:59+02:00", "utc": "2037-11-05T22:02:59Z", "ms": 2141071379440.1895 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-06", "window": { "start": { "local": "2037-11-06T23:15:02+02:00", "utc": "2037-11-06T21:15:02Z", "ms": 2141154902181.2456 }, "end": { "local": "2037-11-07T00:03:02+02:00", "utc": "2037-11-06T22:03:02Z", "ms": 2141157782181.2456 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 20:50 on Thu 5 Nov to 17:23 on Fri 6 Nov.", "fact": "2037-11-05T18:49:57Z → 2037-11-06T15:22:45Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:15–00:03 on the 5th, 23:15–00:03 on the 6th.", "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 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 night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 8703 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Thursday 5 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": "2037-11-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-05", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Thursday 5 November. Caturdaśī runs from 20:50 on Thu 5 Nov to 17:23 on Fri 6 Nov and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-11-05", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/naraka-chaturdashi", "festival": "naraka-chaturdashi", "name": "Naraka Caturdaśī", "everyday": "Choti Diwali", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 27492, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 }, "end": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-05T20:49:57+02:00", "utc": "2037-11-05T18:49:57Z", "ms": 2141059796876.1028 }, "end": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 } }, "kaala": "arunodaya", "days": [ { "local_date": "2037-11-06", "window": { "start": { "local": "2037-11-06T04:28:08+02:00", "utc": "2037-11-06T02:28:08Z", "ms": 2141087288397.6855 }, "end": { "local": "2037-11-06T06:13:17+02:00", "utc": "2037-11-06T04:13:17Z", "ms": 2141093597109.5022 } }, "covered_min": 105, "window_min": 105, "qualifies": true }, { "local_date": "2037-11-07", "window": { "start": { "local": "2037-11-07T04:28:44+02:00", "utc": "2037-11-07T02:28:44Z", "ms": 2141173724172.8132 }, "end": { "local": "2037-11-07T06:14:05+02:00", "utc": "2037-11-07T04:14:05Z", "ms": 2141180044897.0198 } }, "covered_min": 0, "window_min": 105, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 20:50 on Thu 5 Nov to 17:23 on Fri 6 Nov.", "fact": "2037-11-05T18:49:57Z → 2037-11-06T15:22:45Z" }, { "step": "kaala", "text": "Aruṇodaya is 2 muhūrtas before sunrise: 04:28–06:13 on the 6th, 04:29–06:14 on the 7th.", "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 105 of 105 minutes on the 6th and 0 of 105 on the 7th.", "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 27492 s" }, { "step": "ruling", "text": "Naraka Caturdaśī, Giza, 2037: Friday 6 November.", "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": "2037-11-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-06", "confidence": "determinate" } ], "quote": "In Giza, Naraka Caturdaśī (Choti Diwali) 2037 falls on Friday 6 November. Caturdaśī runs from 20:50 on Thu 5 Nov to 17:23 on Fri 6 Nov and covers all of aruṇodaya that dawn.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/diwali-lakshmi-puja", "festival": "diwali-lakshmi-puja", "name": "Lakṣmī Pūjā", "everyday": "Diwali", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1126, "anga": { "type": "tithi", "index": 29, "key": "amavasya", "name": "Amāvasyā", "start": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 }, "end": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 }, "end": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-11-06", "window": { "start": { "local": "2037-11-06T17:03:59+02:00", "utc": "2037-11-06T15:03:59Z", "ms": 2141132639465.4714 }, "end": { "local": "2037-11-06T18:49:20+02:00", "utc": "2037-11-06T16:49:20Z", "ms": 2141138960189.678 } }, "covered_min": 87, "window_min": 105, "qualifies": true }, { "local_date": "2037-11-07", "window": { "start": { "local": "2037-11-07T17:03:19+02:00", "utc": "2037-11-07T15:03:19Z", "ms": 2141218998529.2256 }, "end": { "local": "2037-11-07T18:48:51+02:00", "utc": "2037-11-07T16:48:51Z", "ms": 2141225331123.6748 } }, "covered_min": 0, "window_min": 106, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Amāvasyā runs from 17:23 on Fri 6 Nov to 14:03 on Sat 7 Nov.", "fact": "2037-11-06T15:22:45Z → 2037-11-07T12:03:11Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:04–18:49 on the 6th, 17:03–18:49 on the 7th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Amāvasyā must be present during pradoṣa. It covers 87 of 105 minutes on the 6th and 0 of 106 on the 7th.", "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 1126 s" }, { "step": "ruling", "text": "Lakṣmī Pūjā, Giza, 2037: Friday 6 November.", "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": "2037-11-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-06", "confidence": "determinate" } ], "quote": "In Giza, Lakṣmī Pūjā (Diwali) 2037 falls on Friday 6 November. Amāvasyā runs from 17:23 on Fri 6 Nov to 14:03 on Sat 7 Nov and covers 87 of 105 minutes of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/kali-puja", "festival": "kali-puja", "name": "Kālī Pūjā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-06", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 21137, "anga": { "type": "tithi", "index": 29, "key": "amavasya", "name": "Amāvasyā", "start": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 }, "end": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "month": { "amanta": 6, "purnimanta": 7, "adhika": false, "amanta_name": "Āśvina", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-06T17:22:45+02:00", "utc": "2037-11-06T15:22:45Z", "ms": 2141133765169.683 }, "end": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 } }, "kaala": "nishita", "days": [ { "local_date": "2037-11-06", "window": { "start": { "local": "2037-11-06T23:15:02+02:00", "utc": "2037-11-06T21:15:02Z", "ms": 2141154902181.2456 }, "end": { "local": "2037-11-07T00:03:02+02:00", "utc": "2037-11-06T22:03:02Z", "ms": 2141157782181.2456 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-07", "window": { "start": { "local": "2037-11-07T23:15:06+02:00", "utc": "2037-11-07T21:15:06Z", "ms": 2141241305758.4106 }, "end": { "local": "2037-11-08T00:03:06+02:00", "utc": "2037-11-07T22:03:06Z", "ms": 2141244185758.4106 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Amāvasyā runs from 17:23 on Fri 6 Nov to 14:03 on Sat 7 Nov.", "fact": "2037-11-06T15:22:45Z → 2037-11-07T12:03:11Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:15–00:03 on the 6th, 23:15–00:03 on the 7th.", "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 6th and 0 of 48 on the 7th.", "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 21137 s" }, { "step": "ruling", "text": "Kālī Pūjā, Giza, 2037: Friday 6 November.", "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": "2037-11-06", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-06", "confidence": "determinate" } ], "quote": "In Giza, Kālī Pūjā 2037 falls on Friday 6 November. Amāvasyā runs from 17:23 on Fri 6 Nov to 14:03 on Sat 7 Nov and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/bali-puja", "festival": "bali-puja", "name": "Bali Pūjā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-07", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 10808, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "end": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "end": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-11-07", "window": { "start": { "local": "2037-11-07T17:03:19+02:00", "utc": "2037-11-07T15:03:19Z", "ms": 2141218998529.2256 }, "end": { "local": "2037-11-07T18:48:51+02:00", "utc": "2037-11-07T16:48:51Z", "ms": 2141225331123.6748 } }, "covered_min": 106, "window_min": 106, "qualifies": true }, { "local_date": "2037-11-08", "window": { "start": { "local": "2037-11-08T17:02:39+02:00", "utc": "2037-11-08T15:02:39Z", "ms": 2141305358981.9678 }, "end": { "local": "2037-11-08T18:48:23+02:00", "utc": "2037-11-08T16:48:23Z", "ms": 2141311703298.7937 } }, "covered_min": 0, "window_min": 106, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 14:03 on Sat 7 Nov to 11:02 on Sun 8 Nov.", "fact": "2037-11-07T12:03:11Z → 2037-11-08T09:02:06Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:03–18:49 on the 7th, 17:03–18:48 on the 8th.", "fact": "pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during pradoṣa. It covers 106 of 106 minutes on the 7th and 0 of 106 on the 8th.", "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 10808 s" }, { "step": "ruling", "text": "Bali Pūjā, Giza, 2037: Saturday 7 November.", "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": "2037-11-07", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-07", "confidence": "determinate" } ], "quote": "In Giza, Bali Pūjā 2037 falls on Saturday 7 November. Pratipadā runs from 14:03 on Sat 7 Nov to 11:02 on Sun 8 Nov and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/govardhana-puja", "festival": "govardhana-puja", "name": "Govardhana Pūjā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 760, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "end": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "end": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-07", "window": { "start": { "local": "2037-11-07T11:14:42+02:00", "utc": "2037-11-07T09:14:42Z", "ms": 2141198081713.1226 }, "end": { "local": "2037-11-07T12:02:42+02:00", "utc": "2037-11-07T10:02:42Z", "ms": 2141200961713.1226 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-11-08", "window": { "start": { "local": "2037-11-08T11:14:46+02:00", "utc": "2037-11-08T09:14:46Z", "ms": 2141284485984.7817 }, "end": { "local": "2037-11-08T12:02:46+02:00", "utc": "2037-11-08T10:02:46Z", "ms": 2141287365984.7817 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "second-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 14:03 on Sat 7 Nov to 11:02 on Sun 8 Nov.", "fact": "2037-11-07T12:03:11Z → 2037-11-08T09:02:06Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 7th, 11:15–12:03 on the 8th.", "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 7th and 0 of 48 on the 8th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Neither midday qualifies. The rule takes the second day.", "fact": "priority: purvaviddha → second-day · margin 760 s" }, { "step": "ruling", "text": "Govardhana Pūjā, Giza, 2037: Sunday 8 November.", "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": "2037-11-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-08", "confidence": "determinate" } ], "quote": "In Giza, Govardhana Pūjā 2037 falls on Sunday 8 November. Pratipadā runs from 14:03 on Sat 7 Nov to 11:02 on Sun 8 Nov, and reaches madhyāhna on neither day.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/yama-dvitiya", "festival": "yama-dvitiya", "name": "Yama Dvitīyā", "everyday": "Bhai Dooj", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 760, "anga": { "type": "tithi", "index": 1, "key": "dvitiya", "name": "Dvitīyā", "start": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 }, "end": { "local": "2037-11-09T08:30:04+02:00", "utc": "2037-11-09T06:30:04Z", "ms": 2141361003603.195 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 }, "end": { "local": "2037-11-09T08:30:04+02:00", "utc": "2037-11-09T06:30:04Z", "ms": 2141361003603.195 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-08", "window": { "start": { "local": "2037-11-08T11:14:46+02:00", "utc": "2037-11-08T09:14:46Z", "ms": 2141284485984.7817 }, "end": { "local": "2037-11-08T12:02:46+02:00", "utc": "2037-11-08T10:02:46Z", "ms": 2141287365984.7817 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-09", "window": { "start": { "local": "2037-11-09T11:14:51+02:00", "utc": "2037-11-09T09:14:51Z", "ms": 2141370891100.7583 }, "end": { "local": "2037-11-09T12:02:51+02:00", "utc": "2037-11-09T10:02:51Z", "ms": 2141373771100.7583 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvitīyā runs from 11:02 on Sun 8 Nov to 08:30 on Mon 9 Nov.", "fact": "2037-11-08T09:02:06Z → 2037-11-09T06:30:04Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 8th, 11:15–12:03 on the 9th.", "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 8th and 0 of 48 on the 9th.", "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 760 s" }, { "step": "ruling", "text": "Yama Dvitīyā, Giza, 2037: Sunday 8 November.", "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": "2037-11-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-08", "confidence": "determinate" } ], "quote": "In Giza, Yama Dvitīyā (Bhai Dooj) 2037 falls on Sunday 8 November. Dvitīyā runs from 11:02 on Sun 8 Nov to 08:30 on Mon 9 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/dyuta-pratipad", "festival": "dyuta-pratipad", "name": "Dyūta Pratipad", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-08", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4278, "anga": { "type": "tithi", "index": 0, "key": "pratipada", "name": "Pratipadā", "start": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "end": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-07T14:03:11+02:00", "utc": "2037-11-07T12:03:11Z", "ms": 2141208190755.1328 }, "end": { "local": "2037-11-08T11:02:06+02:00", "utc": "2037-11-08T09:02:06Z", "ms": 2141283726451.9768 } }, "kaala": "purvahna", "days": [ { "local_date": "2037-11-07", "window": { "start": { "local": "2037-11-07T06:14:05+02:00", "utc": "2037-11-07T04:14:05Z", "ms": 2141180044897.0198 }, "end": { "local": "2037-11-07T09:50:29+02:00", "utc": "2037-11-07T07:50:29Z", "ms": 2141193029441.0884 } }, "covered_min": 0, "window_min": 216, "qualifies": false }, { "local_date": "2037-11-08", "window": { "start": { "local": "2037-11-08T06:14:53+02:00", "utc": "2037-11-08T04:14:53Z", "ms": 2141266492987.5955 }, "end": { "local": "2037-11-08T09:50:48+02:00", "utc": "2037-11-08T07:50:48Z", "ms": 2141279448319.053 } }, "covered_min": 216, "window_min": 216, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pratipadā runs from 14:03 on Sat 7 Nov to 11:02 on Sun 8 Nov.", "fact": "2037-11-07T12:03:11Z → 2037-11-08T09:02:06Z" }, { "step": "kaala", "text": "Pūrvāhṇa is first 5 of 15 day muhūrtas: 06:14–09:50 on the 7th, 06:15–09:51 on the 8th.", "fact": "purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pratipadā must be present during pūrvāhṇa. It covers 0 of 216 minutes on the 7th and 216 of 216 on the 8th.", "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 4278 s" }, { "step": "ruling", "text": "Dyūta Pratipad, Giza, 2037: Sunday 8 November.", "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": "2037-11-08", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-08", "confidence": "determinate" } ], "quote": "In Giza, Dyūta Pratipad 2037 falls on Sunday 8 November. Pratipadā runs from 14:03 on Sat 7 Nov to 11:02 on Sun 8 Nov and covers all of pūrvāhṇa that forenoon.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/naga-chaturthi", "festival": "naga-chaturthi", "name": "Nāga Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16709, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-11-10T06:36:28+02:00", "utc": "2037-11-10T04:36:28Z", "ms": 2141440588102.5886 }, "end": { "local": "2037-11-11T05:28:46+02:00", "utc": "2037-11-11T03:28:46Z", "ms": 2141522926097.0564 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-10T06:36:28+02:00", "utc": "2037-11-10T04:36:28Z", "ms": 2141440588102.5886 }, "end": { "local": "2037-11-11T05:28:46+02:00", "utc": "2037-11-11T03:28:46Z", "ms": 2141522926097.0564 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-10", "window": { "start": { "local": "2037-11-10T11:14:57+02:00", "utc": "2037-11-10T09:14:57Z", "ms": 2141457297058.9753 }, "end": { "local": "2037-11-10T12:02:57+02:00", "utc": "2037-11-10T10:02:57Z", "ms": 2141460177058.9753 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-11", "window": { "start": { "local": "2037-11-11T11:15:04+02:00", "utc": "2037-11-11T09:15:04Z", "ms": 2141543703857.294 }, "end": { "local": "2037-11-11T12:03:04+02:00", "utc": "2037-11-11T10:03:04Z", "ms": 2141546583857.294 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 06:36 on Tue 10 Nov to 05:29 on Wed 11 Nov.", "fact": "2037-11-10T04:36:28Z → 2037-11-11T03:28:46Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 10th, 11:15–12:03 on the 11th.", "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 10th and 0 of 48 on the 11th.", "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 16709 s" }, { "step": "ruling", "text": "Nāga Caturthī, Giza, 2037: Tuesday 10 November.", "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": "2037-11-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-10", "confidence": "determinate" } ], "quote": "In Giza, Nāga Caturthī 2037 falls on Tuesday 10 November. Caturthī runs from 06:36 on Tue 10 Nov to 05:29 on Wed 11 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-11-10", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 16709, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-11-10T06:36:28+02:00", "utc": "2037-11-10T04:36:28Z", "ms": 2141440588102.5886 }, "end": { "local": "2037-11-11T05:28:46+02:00", "utc": "2037-11-11T03:28:46Z", "ms": 2141522926097.0564 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-10T06:36:28+02:00", "utc": "2037-11-10T04:36:28Z", "ms": 2141440588102.5886 }, "end": { "local": "2037-11-11T05:28:46+02:00", "utc": "2037-11-11T03:28:46Z", "ms": 2141522926097.0564 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-10", "window": { "start": { "local": "2037-11-10T11:14:57+02:00", "utc": "2037-11-10T09:14:57Z", "ms": 2141457297058.9753 }, "end": { "local": "2037-11-10T12:02:57+02:00", "utc": "2037-11-10T10:02:57Z", "ms": 2141460177058.9753 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-11", "window": { "start": { "local": "2037-11-11T11:15:04+02:00", "utc": "2037-11-11T09:15:04Z", "ms": 2141543703857.294 }, "end": { "local": "2037-11-11T12:03:04+02:00", "utc": "2037-11-11T10:03:04Z", "ms": 2141546583857.294 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 06:36 on Tue 10 Nov to 05:29 on Wed 11 Nov.", "fact": "2037-11-10T04:36:28Z → 2037-11-11T03:28:46Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 10th, 11:15–12:03 on the 11th.", "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 10th and 0 of 48 on the 11th.", "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 16709 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Tuesday 10 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": "2037-11-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-10", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Tuesday 10 November. Caturthī runs from 06:36 on Tue 10 Nov to 05:29 on Wed 11 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-11-10", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/surya-shashthi", "festival": "surya-shashthi", "name": "Sūrya Ṣaṣṭhī", "everyday": "Chhath", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 19843, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-11-12T05:11:22+02:00", "utc": "2037-11-12T03:11:22Z", "ms": 2141608281701.1724 }, "end": { "local": "2037-11-13T05:44:37+02:00", "utc": "2037-11-13T03:44:37Z", "ms": 2141696677090.1436 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-12T05:11:22+02:00", "utc": "2037-11-12T03:11:22Z", "ms": 2141608281701.1724 }, "end": { "local": "2037-11-13T05:44:37+02:00", "utc": "2037-11-13T03:44:37Z", "ms": 2141696677090.1436 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-12", "window": { "start": { "local": "2037-11-12T11:15:11+02:00", "utc": "2037-11-12T09:15:11Z", "ms": 2141630111493.6333 }, "end": { "local": "2037-11-12T12:03:11+02:00", "utc": "2037-11-12T10:03:11Z", "ms": 2141632991493.6333 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-13", "window": { "start": { "local": "2037-11-13T11:15:20+02:00", "utc": "2037-11-13T09:15:20Z", "ms": 2141716519965.9248 }, "end": { "local": "2037-11-13T12:03:20+02:00", "utc": "2037-11-13T10:03:20Z", "ms": 2141719399965.9248 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 05:11 on Thu 12 Nov to 05:45 on Fri 13 Nov.", "fact": "2037-11-12T03:11:22Z → 2037-11-13T03:44:37Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 12th, 11:15–12:03 on the 13th.", "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 12th and 0 of 48 on the 13th.", "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 19843 s" }, { "step": "ruling", "text": "Sūrya Ṣaṣṭhī, Giza, 2037: Thursday 12 November.", "fact": "confidence: determinate" } ], "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": "2037-11-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-12", "confidence": "determinate" } ], "quote": "In Giza, Sūrya Ṣaṣṭhī (Chhath) 2037 falls on Thursday 12 November. Ṣaṣṭhī runs from 05:11 on Thu 12 Nov to 05:45 on Fri 13 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/gopashtami", "festival": "gopashtami", "name": "Gopāṣṭamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-14", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 8057, "anga": { "type": "tithi", "index": 7, "key": "ashtami", "name": "Aṣṭamī", "start": { "local": "2037-11-14T07:04:14+02:00", "utc": "2037-11-14T05:04:14Z", "ms": 2141787854368.1794 }, "end": { "local": "2037-11-15T09:01:22+02:00", "utc": "2037-11-15T07:01:22Z", "ms": 2141881282385.4976 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-14T07:04:14+02:00", "utc": "2037-11-14T05:04:14Z", "ms": 2141787854368.1794 }, "end": { "local": "2037-11-15T09:01:22+02:00", "utc": "2037-11-15T07:01:22Z", "ms": 2141881282385.4976 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-14", "window": { "start": { "local": "2037-11-14T11:15:29+02:00", "utc": "2037-11-14T09:15:29Z", "ms": 2141802929271.9712 }, "end": { "local": "2037-11-14T12:03:29+02:00", "utc": "2037-11-14T10:03:29Z", "ms": 2141805809271.9712 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-15", "window": { "start": { "local": "2037-11-15T11:15:39+02:00", "utc": "2037-11-15T09:15:39Z", "ms": 2141889339409.2788 }, "end": { "local": "2037-11-15T12:03:39+02:00", "utc": "2037-11-15T10:03:39Z", "ms": 2141892219409.2788 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Aṣṭamī runs from 07:04 on Sat 14 Nov to 09:01 on Sun 15 Nov.", "fact": "2037-11-14T05:04:14Z → 2037-11-15T07:01:22Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 14th, 11:16–12:04 on the 15th.", "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 14th and 0 of 48 on the 15th.", "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 8057 s" }, { "step": "ruling", "text": "Gopāṣṭamī, Giza, 2037: Saturday 14 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": "2037-11-14", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-14", "confidence": "determinate" } ], "quote": "In Giza, Gopāṣṭamī 2037 falls on Saturday 14 November. Aṣṭamī runs from 07:04 on Sat 14 Nov to 09:01 on Sun 15 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/durga-navami", "festival": "durga-navami", "name": "Durgā Navamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-15", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 472, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "2037-11-15T09:01:22+02:00", "utc": "2037-11-15T07:01:22Z", "ms": 2141881282385.4976 }, "end": { "local": "2037-11-16T11:23:43+02:00", "utc": "2037-11-16T09:23:43Z", "ms": 2141976222564.1 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-15T09:01:22+02:00", "utc": "2037-11-15T07:01:22Z", "ms": 2141881282385.4976 }, "end": { "local": "2037-11-16T11:23:43+02:00", "utc": "2037-11-16T09:23:43Z", "ms": 2141976222564.1 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-15", "window": { "start": { "local": "2037-11-15T11:15:39+02:00", "utc": "2037-11-15T09:15:39Z", "ms": 2141889339409.2788 }, "end": { "local": "2037-11-15T12:03:39+02:00", "utc": "2037-11-15T10:03:39Z", "ms": 2141892219409.2788 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-16", "window": { "start": { "local": "2037-11-16T11:15:50+02:00", "utc": "2037-11-16T09:15:50Z", "ms": 2141975750374.911 }, "end": { "local": "2037-11-16T12:03:50+02:00", "utc": "2037-11-16T10:03:50Z", "ms": 2141978630374.911 } }, "covered_min": 8, "window_min": 48, "qualifies": true } ], "decided_by": "purvaviddha", "explanation": [ { "step": "anga", "text": "Navamī runs from 09:01 on Sun 15 Nov to 11:24 on Mon 16 Nov.", "fact": "2037-11-15T07:01:22Z → 2037-11-16T09:23:43Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:16–12:04 on the 15th, 11:16–12:04 on the 16th.", "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 15th and 8 of 48 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Both middays qualify. Pūrvaviddhā: the first is taken.", "fact": "priority: purvaviddha → purvaviddha · margin 472 s" }, { "step": "ruling", "text": "Durgā Navamī, Giza, 2037: Sunday 15 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": "2037-11-15", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-15", "confidence": "determinate" } ], "quote": "In Giza, Durgā Navamī 2037 falls on Sunday 15 November. Navamī runs from 09:01 on Sun 15 Nov to 11:24 on Mon 16 Nov and covers all of madhyāhna that midday. It also reaches the next midday for 8 minutes; by the rule the first midday is taken.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/akshaya-navami", "festival": "akshaya-navami", "name": "Akṣaya Navamī", "everyday": "Amla Navami", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-16", "confidence": "boundary", "boundary_reasons": [ "tie-break-unstated" ], "boundary_margin_s": 3116, "anga": { "type": "tithi", "index": 8, "key": "navami", "name": "Navamī", "start": { "local": "2037-11-15T09:01:22+02:00", "utc": "2037-11-15T07:01:22Z", "ms": 2141881282385.4976 }, "end": { "local": "2037-11-16T11:23:43+02:00", "utc": "2037-11-16T09:23:43Z", "ms": 2141976222564.1 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-15T09:01:22+02:00", "utc": "2037-11-15T07:01:22Z", "ms": 2141881282385.4976 }, "end": { "local": "2037-11-16T11:23:43+02:00", "utc": "2037-11-16T09:23:43Z", "ms": 2141976222564.1 } }, "kaala": "purvahna", "days": [ { "local_date": "2037-11-15", "window": { "start": { "local": "2037-11-15T06:20:36+02:00", "utc": "2037-11-15T04:20:36Z", "ms": 2141871636094.129 }, "end": { "local": "2037-11-15T09:53:18+02:00", "utc": "2037-11-15T07:53:18Z", "ms": 2141884398304.2288 } }, "covered_min": 52, "window_min": 213, "qualifies": true }, { "local_date": "2037-11-16", "window": { "start": { "local": "2037-11-16T06:21:26+02:00", "utc": "2037-11-16T04:21:26Z", "ms": 2141958085736.6016 }, "end": { "local": "2037-11-16T09:53:42+02:00", "utc": "2037-11-16T07:53:42Z", "ms": 2141970822162.141 } }, "covered_min": 212, "window_min": 212, "qualifies": true } ], "decided_by": "greater-coverage", "explanation": [ { "step": "anga", "text": "Navamī runs from 09:01 on Sun 15 Nov to 11:24 on Mon 16 Nov.", "fact": "2037-11-15T07:01:22Z → 2037-11-16T09:23:43Z" }, { "step": "kaala", "text": "Pūrvāhṇa is first 5 of 15 day muhūrtas: 06:21–09:53 on the 15th, 06:21–09:54 on the 16th.", "fact": "purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Navamī must be present during pūrvāhṇa. It covers 52 of 213 minutes on the 15th and 212 of 212 on the 16th.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Both forenoons qualify and the rule marks neither. The one covered longer is ruled, as a boundary.", "fact": "priority: unstated → greater-coverage · margin 3116 s" }, { "step": "ruling", "text": "Akṣaya Navamī, Giza, 2037: Monday 16 November.", "fact": "confidence: boundary (tie-break-unstated)" } ], "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": "2037-11-16", "confidence": "boundary" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-16", "confidence": "boundary" } ], "quote": "In Giza, Akṣaya Navamī (Amla Navami) 2037 falls on Monday 16 November. Navamī runs from 09:01 on Sun 15 Nov to 11:24 on Mon 16 Nov and covers all of pūrvāhṇa that forenoon. It also reaches the previous forenoon for 52 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/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-11-18", "festival": "ekadashi", "name": "Prabodhinī Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 27309, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-11-17T13:57:25+02:00", "utc": "2037-11-17T11:57:25Z", "ms": 2142071844846.1797 }, "end": { "local": "2037-11-18T16:29:20+02:00", "utc": "2037-11-18T14:29:20Z", "ms": 2142167360219.3728 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-17T13:57:25+02:00", "utc": "2037-11-17T11:57:25Z", "ms": 2142071844846.1797 }, "end": { "local": "2037-11-18T16:29:20+02:00", "utc": "2037-11-18T14:29:20Z", "ms": 2142167360219.3728 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-11-17", "window": { "start": { "local": "2037-11-17T06:22:15+02:00", "utc": "2037-11-17T04:22:15Z", "ms": 2142044535459.4749 }, "end": { "local": "2037-11-17T06:22:15+02:00", "utc": "2037-11-17T04:22:15Z", "ms": 2142044535459.4749 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-11-18", "window": { "start": { "local": "2037-11-18T06:23:05+02:00", "utc": "2037-11-18T04:23:05Z", "ms": 2142130985236.0696 }, "end": { "local": "2037-11-18T06:23:05+02:00", "utc": "2037-11-18T04:23:05Z", "ms": 2142130985236.0696 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 13:57 on Tue 17 Nov to 16:29 on Wed 18 Nov.", "fact": "2037-11-17T11:57:25Z → 2037-11-18T14:29:20Z" }, { "step": "kaala", "text": "Sunrise is at 06:22 on the 17th and 06:23 on the 18th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 17th and is on the 18th.", "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 27309 s" }, { "step": "ruling", "text": "Prabodhinī Ekādaśī, Giza, 2037: Wednesday 18 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": "2037-11-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-18", "confidence": "determinate" } ], "quote": "In Giza, Prabodhinī Ekādaśī 2037 falls on Wednesday 18 November. Ekādaśī runs from 13:57 on Tue 17 Nov to 16:29 on Wed 18 Nov and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-11-18", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-11-20", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-20", "confidence": "boundary", "boundary_reasons": [ "margin" ], "boundary_margin_s": 245, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-11-19T18:48:48+02:00", "utc": "2037-11-19T16:48:48Z", "ms": 2142262127863.381 }, "end": { "local": "2037-11-20T20:48:29+02:00", "utc": "2037-11-20T18:48:29Z", "ms": 2142355709139.9448 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-19T18:48:48+02:00", "utc": "2037-11-19T16:48:48Z", "ms": 2142262127863.381 }, "end": { "local": "2037-11-20T20:48:29+02:00", "utc": "2037-11-20T18:48:29Z", "ms": 2142355709139.9448 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-11-19", "window": { "start": { "local": "2037-11-19T16:57:01+02:00", "utc": "2037-11-19T14:57:01Z", "ms": 2142255421368.3528 }, "end": { "local": "2037-11-19T18:44:43+02:00", "utc": "2037-11-19T16:44:43Z", "ms": 2142261883164.6584 } }, "covered_min": 0, "window_min": 108, "qualifies": false }, { "local_date": "2037-11-20", "window": { "start": { "local": "2037-11-20T16:56:40+02:00", "utc": "2037-11-20T14:56:40Z", "ms": 2142341800042.0833 }, "end": { "local": "2037-11-20T18:44:31+02:00", "utc": "2037-11-20T16:44:31Z", "ms": 2142348271318.1008 } }, "covered_min": 108, "window_min": 108, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 18:49 on Thu 19 Nov to 20:48 on Fri 20 Nov.", "fact": "2037-11-19T16:48:48Z → 2037-11-20T18:48:29Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 16:57–18:45 on the 19th, 16:57–18:45 on the 20th.", "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 108 minutes on the 19th and 108 of 108 on the 20th.", "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 245 s < 300 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Friday 20 November.", "fact": "confidence: boundary (margin)" } ], "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": "2037-11-20", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-20", "confidence": "boundary" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Friday 20 November. Trayodaśī runs from 18:49 on Thu 19 Nov to 20:48 on Fri 20 Nov and covers all of pradoṣa that evening. It is 4 min 05 s from a threshold: treat the date as contested.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-11-20", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/kartiki-purnima", "festival": "kartiki-purnima", "name": "Kārtikī Pūrṇimā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 37168, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-11-21T22:24:26+02:00", "utc": "2037-11-21T20:24:26Z", "ms": 2142447865667.174 }, "end": { "local": "2037-11-22T23:35:18+02:00", "utc": "2037-11-22T21:35:18Z", "ms": 2142538517758.2651 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-21T22:24:26+02:00", "utc": "2037-11-21T20:24:26Z", "ms": 2142447865667.174 }, "end": { "local": "2037-11-22T23:35:18+02:00", "utc": "2037-11-22T21:35:18Z", "ms": 2142538517758.2651 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-11-21", "window": { "start": { "local": "2037-11-21T11:16:57+02:00", "utc": "2037-11-21T09:16:57Z", "ms": 2142407817483.3286 }, "end": { "local": "2037-11-21T12:04:57+02:00", "utc": "2037-11-21T10:04:57Z", "ms": 2142410697483.3286 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-11-22", "window": { "start": { "local": "2037-11-22T11:17:13+02:00", "utc": "2037-11-22T09:17:13Z", "ms": 2142494233322.703 }, "end": { "local": "2037-11-22T12:05:13+02:00", "utc": "2037-11-22T10:05:13Z", "ms": 2142497113322.703 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 22:24 on Sat 21 Nov to 23:35 on Sun 22 Nov.", "fact": "2037-11-21T20:24:26Z → 2037-11-22T21:35:18Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:17–12:05 on the 21st, 11:17–12:05 on the 22nd.", "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 21st and 48 of 48 on the 22nd.", "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 37168 s" }, { "step": "ruling", "text": "Kārtikī Pūrṇimā, Giza, 2037: Sunday 22 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": "2037-11-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-22", "confidence": "determinate" } ], "quote": "In Giza, Kārtikī Pūrṇimā 2037 falls on Sunday 22 November. Pūrṇimā runs from 22:24 on Sat 21 Nov to 23:35 on Sun 22 Nov and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/rasayatra", "festival": "rasayatra", "name": "Rāsayātrā", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-22", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 1060, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-11-21T22:24:26+02:00", "utc": "2037-11-21T20:24:26Z", "ms": 2142447865667.174 }, "end": { "local": "2037-11-22T23:35:18+02:00", "utc": "2037-11-22T21:35:18Z", "ms": 2142538517758.2651 }, "month": { "amanta": 7, "purnimanta": 7, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Kārtika" } }, "span": { "of": "tithi", "start": { "local": "2037-11-21T22:24:26+02:00", "utc": "2037-11-21T20:24:26Z", "ms": 2142447865667.174 }, "end": { "local": "2037-11-22T23:35:18+02:00", "utc": "2037-11-22T21:35:18Z", "ms": 2142538517758.2651 } }, "kaala": "nishita", "days": [ { "local_date": "2037-11-21", "window": { "start": { "local": "2037-11-21T23:17:22+02:00", "utc": "2037-11-21T21:17:22Z", "ms": 2142451042339.5566 }, "end": { "local": "2037-11-22T00:05:22+02:00", "utc": "2037-11-21T22:05:22Z", "ms": 2142453922339.5566 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-11-22", "window": { "start": { "local": "2037-11-22T23:17:38+02:00", "utc": "2037-11-22T21:17:38Z", "ms": 2142537458134.47 }, "end": { "local": "2037-11-23T00:05:38+02:00", "utc": "2037-11-22T22:05:38Z", "ms": 2142540338134.47 } }, "covered_min": 18, "window_min": 48, "qualifies": true } ], "decided_by": "paraviddha", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 22:24 on Sat 21 Nov to 23:35 on Sun 22 Nov.", "fact": "2037-11-21T20:24:26Z → 2037-11-22T21:35:18Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:17–00:05 on the 21st, 23:18–00:06 on the 22nd.", "fact": "nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Pūrṇimā must be present during niśītha. It covers 48 of 48 minutes on the 21st and 18 of 48 on the 22nd.", "fact": "Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104" }, { "step": "tie_break", "text": "Both nights qualify. Paraviddhā: the second is taken.", "fact": "priority: paraviddha → paraviddha · margin 1060 s" }, { "step": "ruling", "text": "Rāsayātrā, Giza, 2037: Sunday 22 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": "2037-11-22", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-22", "confidence": "determinate" } ], "quote": "In Giza, Rāsayātrā 2037 falls on Sunday 22 November. Pūrṇimā runs from 22:24 on Sat 21 Nov to 23:35 on Sun 22 Nov and covers 18 of 48 minutes of niśītha that night. It also reaches the previous night for 48 minutes; by the rule the second night is taken.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-11-26", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-11-26", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 15110, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-11-26T00:43:33+02:00", "utc": "2037-11-25T22:43:33Z", "ms": 2142801812795.0442 }, "end": { "local": "2037-11-27T00:21:04+02:00", "utc": "2037-11-26T22:21:04Z", "ms": 2142886863617.8074 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-11-26T00:43:33+02:00", "utc": "2037-11-25T22:43:33Z", "ms": 2142801812795.0442 }, "end": { "local": "2037-11-27T00:21:04+02:00", "utc": "2037-11-26T22:21:04Z", "ms": 2142886863617.8074 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-11-25", "window": { "start": { "local": "2037-11-25T19:13:33+02:00", "utc": "2037-11-25T17:13:33Z", "ms": 2142782012778.4082 }, "end": { "local": "2037-11-25T19:13:33+02:00", "utc": "2037-11-25T17:13:33Z", "ms": 2142782012778.4082 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-11-26", "window": { "start": { "local": "2037-11-26T20:09:13+02:00", "utc": "2037-11-26T18:09:13Z", "ms": 2142871753177.9602 }, "end": { "local": "2037-11-26T20:09:13+02:00", "utc": "2037-11-26T18:09:13Z", "ms": 2142871753177.9602 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 00:44 on Thu 26 Nov to 00:21 on Fri 27 Nov.", "fact": "2037-11-25T22:43:33Z → 2037-11-26T22:21:04Z" }, { "step": "kaala", "text": "Moonrise is at 19:14 on the 25th and 20:09 on the 26th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is not on the 25th and is on the 26th.", "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 15110 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Thursday 26 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": "2037-11-26", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-11-26", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Thursday 26 November. Caturthī runs from 00:44 on Thu 26 Nov to 00:21 on Fri 27 Nov and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-11-26", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/ekadashi?on=2037-12-03", "festival": "ekadashi", "name": "Utpannā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-03", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 18847, "anga": { "type": "tithi", "index": 25, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-12-02T14:28:56+02:00", "utc": "2037-12-02T12:28:56Z", "ms": 2143369736204.0466 }, "end": { "local": "2037-12-03T11:49:25+02:00", "utc": "2037-12-03T09:49:25Z", "ms": 2143446564564.566 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-02T14:28:56+02:00", "utc": "2037-12-02T12:28:56Z", "ms": 2143369736204.0466 }, "end": { "local": "2037-12-03T11:49:25+02:00", "utc": "2037-12-03T09:49:25Z", "ms": 2143446564564.566 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-12-02", "window": { "start": { "local": "2037-12-02T06:34:31+02:00", "utc": "2037-12-02T04:34:31Z", "ms": 2143341271132.5737 }, "end": { "local": "2037-12-02T06:34:31+02:00", "utc": "2037-12-02T04:34:31Z", "ms": 2143341271132.5737 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-12-03", "window": { "start": { "local": "2037-12-03T06:35:18+02:00", "utc": "2037-12-03T04:35:18Z", "ms": 2143427717981.8262 }, "end": { "local": "2037-12-03T06:35:18+02:00", "utc": "2037-12-03T04:35:18Z", "ms": 2143427717981.8262 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 14:29 on Wed 2 Dec to 11:49 on Thu 3 Dec.", "fact": "2037-12-02T12:28:56Z → 2037-12-03T09:49:25Z" }, { "step": "kaala", "text": "Sunrise is at 06:35 on the 2nd and 06:35 on the 3rd.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 2nd and is 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 18847 s" }, { "step": "ruling", "text": "Utpannā Ekādaśī, Giza, 2037: Thursday 3 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": "2037-12-03", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-03", "confidence": "determinate" } ], "quote": "In Giza, Utpannā Ekādaśī 2037 falls on Thursday 3 December. Ekādaśī runs from 14:29 on Wed 2 Dec to 11:49 on Thu 3 Dec and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-12-03", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/pradosha-vrata?on=2037-12-04", "festival": "pradosha-vrata", "name": "Kṛṣṇa Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-04", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28199, "anga": { "type": "tithi", "index": 27, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-12-04T09:04:40+02:00", "utc": "2037-12-04T07:04:40Z", "ms": 2143523080191.0872 }, "end": { "local": "2037-12-05T06:22:17+02:00", "utc": "2037-12-05T04:22:17Z", "ms": 2143599737068.0999 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-04T09:04:40+02:00", "utc": "2037-12-04T07:04:40Z", "ms": 2143523080191.0872 }, "end": { "local": "2037-12-05T06:22:17+02:00", "utc": "2037-12-05T04:22:17Z", "ms": 2143599737068.0999 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-12-04", "window": { "start": { "local": "2037-12-04T16:54:39+02:00", "utc": "2037-12-04T14:54:39Z", "ms": 2143551278856.8455 }, "end": { "local": "2037-12-04T18:44:16+02:00", "utc": "2037-12-04T16:44:16Z", "ms": 2143557856360.731 } }, "covered_min": 110, "window_min": 110, "qualifies": true }, { "local_date": "2037-12-05", "window": { "start": { "local": "2037-12-05T16:54:43+02:00", "utc": "2037-12-05T14:54:43Z", "ms": 2143637683105.8123 }, "end": { "local": "2037-12-05T18:44:26+02:00", "utc": "2037-12-05T16:44:26Z", "ms": 2143644266071.116 } }, "covered_min": 0, "window_min": 110, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 09:05 on Fri 4 Dec to 06:22 on Sat 5 Dec.", "fact": "2037-12-04T07:04:40Z → 2037-12-05T04:22:17Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 16:55–18:44 on the 4th, 16:55–18:44 on the 5th.", "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 4th and 0 of 110 on the 5th.", "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 28199 s" }, { "step": "ruling", "text": "Kṛṣṇa Pradoṣa Vrata, Giza, 2037: Friday 4 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": "2037-12-04", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-04", "confidence": "determinate" } ], "quote": "In Giza, Kṛṣṇa Pradoṣa Vrata 2037 falls on Friday 4 December. Trayodaśī runs from 09:05 on Fri 4 Dec to 06:22 on Sat 5 Dec and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-12-04", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/shivaratri?on=2037-12-05", "festival": "shivaratri", "name": "Śivarātri", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-05", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 13228, "anga": { "type": "tithi", "index": 28, "key": "chaturdashi", "name": "Caturdaśī", "start": { "local": "2037-12-05T06:22:17+02:00", "utc": "2037-12-05T04:22:17Z", "ms": 2143599737068.0999 }, "end": { "local": "2037-12-06T03:50:37+02:00", "utc": "2037-12-06T01:50:37Z", "ms": 2143677037428.827 }, "month": { "amanta": 7, "purnimanta": 8, "adhika": false, "amanta_name": "Kārtika", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-05T06:22:17+02:00", "utc": "2037-12-05T04:22:17Z", "ms": 2143599737068.0999 }, "end": { "local": "2037-12-06T03:50:37+02:00", "utc": "2037-12-06T01:50:37Z", "ms": 2143677037428.827 } }, "kaala": "nishita", "days": [ { "local_date": "2037-12-04", "window": { "start": { "local": "2037-12-04T23:21:44+02:00", "utc": "2037-12-04T21:21:44Z", "ms": 2143574504496.4163 }, "end": { "local": "2037-12-05T00:09:44+02:00", "utc": "2037-12-04T22:09:44Z", "ms": 2143577384496.4163 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-12-05", "window": { "start": { "local": "2037-12-05T23:22:09+02:00", "utc": "2037-12-05T21:22:09Z", "ms": 2143660929225.701 }, "end": { "local": "2037-12-06T00:10:09+02:00", "utc": "2037-12-05T22:10:09Z", "ms": 2143663809225.701 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturdaśī runs from 06:22 on Sat 5 Dec to 03:51 on Sun 6 Dec.", "fact": "2037-12-05T04:22:17Z → 2037-12-06T01:50:37Z" }, { "step": "kaala", "text": "Niśītha is 1 ghaṭikā either side of midnight: 23:22–00:10 on the 4th, 23:22–00:10 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 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 night qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 13228 s" }, { "step": "ruling", "text": "Śivarātri, Giza, 2037: Saturday 5 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": "2037-12-05", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-05", "confidence": "determinate" } ], "quote": "In Giza, Śivarātri 2037 falls on Saturday 5 December. Caturdaśī runs from 06:22 on Sat 5 Dec to 03:51 on Sun 6 Dec and covers all of niśītha that night.", "cite": "https://ahargana.org/giza/festivals/2037/shivaratri?on=2037-12-05", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/vinayaka-chaturthi?on=2037-12-10", "festival": "vinayaka-chaturthi", "name": "Vināyaka Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-10", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36397, "anga": { "type": "tithi", "index": 3, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-12-09T22:18:09+02:00", "utc": "2037-12-09T20:18:09Z", "ms": 2144002689191.7322 }, "end": { "local": "2037-12-10T22:35:29+02:00", "utc": "2037-12-10T20:35:29Z", "ms": 2144090129051.037 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-09T22:18:09+02:00", "utc": "2037-12-09T20:18:09Z", "ms": 2144002689191.7322 }, "end": { "local": "2037-12-10T22:35:29+02:00", "utc": "2037-12-10T20:35:29Z", "ms": 2144090129051.037 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-12-09", "window": { "start": { "local": "2037-12-09T11:23:32+02:00", "utc": "2037-12-09T09:23:32Z", "ms": 2143963411937.0352 }, "end": { "local": "2037-12-09T12:11:32+02:00", "utc": "2037-12-09T10:11:32Z", "ms": 2143966291937.0352 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-12-10", "window": { "start": { "local": "2037-12-10T11:23:59+02:00", "utc": "2037-12-10T09:23:59Z", "ms": 2144049839404.9507 }, "end": { "local": "2037-12-10T12:11:59+02:00", "utc": "2037-12-10T10:11:59Z", "ms": 2144052719404.9507 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 22:18 on Wed 9 Dec to 22:35 on Thu 10 Dec.", "fact": "2037-12-09T20:18:09Z → 2037-12-10T20:35:29Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:24–12:12 on the 9th, 11:24–12:12 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 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. 108" }, { "step": "tie_break", "text": "Only one midday qualifies. No tie-break is needed.", "fact": "priority: unstated → only-day · margin 36397 s" }, { "step": "ruling", "text": "Vināyaka Caturthī, Giza, 2037: Thursday 10 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": "2037-12-10", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-10", "confidence": "determinate" } ], "quote": "In Giza, Vināyaka Caturthī 2037 falls on Thursday 10 December. Caturthī runs from 22:18 on Wed 9 Dec to 22:35 on Thu 10 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/vinayaka-chaturthi?on=2037-12-10", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/naga-panchami-margashirsha", "festival": "naga-panchami-margashirsha", "name": "Nāga Pañcamī (Mārgaśīrṣa)", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-11", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 37410, "anga": { "type": "tithi", "index": 4, "key": "panchami", "name": "Pañcamī", "start": { "local": "2037-12-10T22:35:29+02:00", "utc": "2037-12-10T20:35:29Z", "ms": 2144090129051.037 }, "end": { "local": "2037-12-11T23:36:57+02:00", "utc": "2037-12-11T21:36:57Z", "ms": 2144180217479.4983 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-10T22:35:29+02:00", "utc": "2037-12-10T20:35:29Z", "ms": 2144090129051.037 }, "end": { "local": "2037-12-11T23:36:57+02:00", "utc": "2037-12-11T21:36:57Z", "ms": 2144180217479.4983 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-12-10", "window": { "start": { "local": "2037-12-10T11:23:59+02:00", "utc": "2037-12-10T09:23:59Z", "ms": 2144049839404.9507 }, "end": { "local": "2037-12-10T12:11:59+02:00", "utc": "2037-12-10T10:11:59Z", "ms": 2144052719404.9507 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-12-11", "window": { "start": { "local": "2037-12-11T11:24:27+02:00", "utc": "2037-12-11T09:24:27Z", "ms": 2144136267262.211 }, "end": { "local": "2037-12-11T12:12:27+02:00", "utc": "2037-12-11T10:12:27Z", "ms": 2144139147262.211 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pañcamī runs from 22:35 on Thu 10 Dec to 23:37 on Fri 11 Dec.", "fact": "2037-12-10T20:35:29Z → 2037-12-11T21:36:57Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:24–12:12 on the 10th, 11:24–12:12 on the 11th.", "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 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 midday qualifies. No tie-break is needed.", "fact": "priority: paraviddha → only-day · margin 37410 s" }, { "step": "ruling", "text": "Nāga Pañcamī (Mārgaśīrṣa), Giza, 2037: Friday 11 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": "2037-12-11", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-11", "confidence": "determinate" } ], "quote": "In Giza, Nāga Pañcamī (Mārgaśīrṣa) 2037 falls on Friday 11 December. Pañcamī runs from 22:35 on Thu 10 Dec to 23:37 on Fri 11 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/champa-shashthi", "festival": "champa-shashthi", "name": "Campā Ṣaṣṭhī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36455, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-12-11T23:36:57+02:00", "utc": "2037-12-11T21:36:57Z", "ms": 2144180217479.4983 }, "end": { "local": "2037-12-13T01:17:49+02:00", "utc": "2037-12-12T23:17:49Z", "ms": 2144272668796.3264 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-11T23:36:57+02:00", "utc": "2037-12-11T21:36:57Z", "ms": 2144180217479.4983 }, "end": { "local": "2037-12-13T01:17:49+02:00", "utc": "2037-12-12T23:17:49Z", "ms": 2144272668796.3264 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-12-12", "window": { "start": { "local": "2037-12-12T11:24:55+02:00", "utc": "2037-12-12T09:24:55Z", "ms": 2144222695475.94 }, "end": { "local": "2037-12-12T12:12:55+02:00", "utc": "2037-12-12T10:12:55Z", "ms": 2144225575475.94 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-12-13", "window": { "start": { "local": "2037-12-13T11:25:24+02:00", "utc": "2037-12-13T09:25:24Z", "ms": 2144309124013.4297 }, "end": { "local": "2037-12-13T12:13:24+02:00", "utc": "2037-12-13T10:13:24Z", "ms": 2144312004013.4297 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 23:37 on Fri 11 Dec to 01:18 on Sun 13 Dec.", "fact": "2037-12-11T21:36:57Z → 2037-12-12T23:17:49Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 12th, 11:25–12:13 on the 13th.", "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 12th and 0 of 48 on the 13th.", "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 36455 s" }, { "step": "ruling", "text": "Campā Ṣaṣṭhī, Giza, 2037: Saturday 12 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": "2037-12-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-12", "confidence": "determinate" } ], "quote": "In Giza, Campā Ṣaṣṭhī 2037 falls on Saturday 12 December. Ṣaṣṭhī runs from 23:37 on Fri 11 Dec to 01:18 on Sun 13 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/skanda-shashthi", "festival": "skanda-shashthi", "name": "Skanda Ṣaṣṭhī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-12", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 36455, "anga": { "type": "tithi", "index": 5, "key": "shashthi", "name": "Ṣaṣṭhī", "start": { "local": "2037-12-11T23:36:57+02:00", "utc": "2037-12-11T21:36:57Z", "ms": 2144180217479.4983 }, "end": { "local": "2037-12-13T01:17:49+02:00", "utc": "2037-12-12T23:17:49Z", "ms": 2144272668796.3264 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-11T23:36:57+02:00", "utc": "2037-12-11T21:36:57Z", "ms": 2144180217479.4983 }, "end": { "local": "2037-12-13T01:17:49+02:00", "utc": "2037-12-12T23:17:49Z", "ms": 2144272668796.3264 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-12-12", "window": { "start": { "local": "2037-12-12T11:24:55+02:00", "utc": "2037-12-12T09:24:55Z", "ms": 2144222695475.94 }, "end": { "local": "2037-12-12T12:12:55+02:00", "utc": "2037-12-12T10:12:55Z", "ms": 2144225575475.94 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-12-13", "window": { "start": { "local": "2037-12-13T11:25:24+02:00", "utc": "2037-12-13T09:25:24Z", "ms": 2144309124013.4297 }, "end": { "local": "2037-12-13T12:13:24+02:00", "utc": "2037-12-13T10:13:24Z", "ms": 2144312004013.4297 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ṣaṣṭhī runs from 23:37 on Fri 11 Dec to 01:18 on Sun 13 Dec.", "fact": "2037-12-11T21:36:57Z → 2037-12-12T23:17:49Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 12th, 11:25–12:13 on the 13th.", "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 12th and 0 of 48 on the 13th.", "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 36455 s" }, { "step": "ruling", "text": "Skanda Ṣaṣṭhī, Giza, 2037: Saturday 12 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": "2037-12-12", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-12", "confidence": "determinate" } ], "quote": "In Giza, Skanda Ṣaṣṭhī 2037 falls on Saturday 12 December. Ṣaṣṭhī runs from 23:37 on Fri 11 Dec to 01:18 on Sun 13 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/mitra-saptami", "festival": "mitra-saptami", "name": "Mitra Saptamī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-13", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 28615, "anga": { "type": "tithi", "index": 6, "key": "saptami", "name": "Saptamī", "start": { "local": "2037-12-13T01:17:49+02:00", "utc": "2037-12-12T23:17:49Z", "ms": 2144272668796.3264 }, "end": { "local": "2037-12-14T03:28:58+02:00", "utc": "2037-12-14T01:28:58Z", "ms": 2144366938094.3157 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-13T01:17:49+02:00", "utc": "2037-12-12T23:17:49Z", "ms": 2144272668796.3264 }, "end": { "local": "2037-12-14T03:28:58+02:00", "utc": "2037-12-14T01:28:58Z", "ms": 2144366938094.3157 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-12-13", "window": { "start": { "local": "2037-12-13T11:25:24+02:00", "utc": "2037-12-13T09:25:24Z", "ms": 2144309124013.4297 }, "end": { "local": "2037-12-13T12:13:24+02:00", "utc": "2037-12-13T10:13:24Z", "ms": 2144312004013.4297 } }, "covered_min": 48, "window_min": 48, "qualifies": true }, { "local_date": "2037-12-14", "window": { "start": { "local": "2037-12-14T11:25:53+02:00", "utc": "2037-12-14T09:25:53Z", "ms": 2144395552842.0845 }, "end": { "local": "2037-12-14T12:13:53+02:00", "utc": "2037-12-14T10:13:53Z", "ms": 2144398432842.0845 } }, "covered_min": 0, "window_min": 48, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Saptamī runs from 01:18 on Sun 13 Dec to 03:29 on Mon 14 Dec.", "fact": "2037-12-12T23:17:49Z → 2037-12-14T01:28:58Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 13th, 11:26–12:14 on the 14th.", "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 13th and 0 of 48 on the 14th.", "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 28615 s" }, { "step": "ruling", "text": "Mitra Saptamī, Giza, 2037: Sunday 13 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": "2037-12-13", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-13", "confidence": "determinate" } ], "quote": "In Giza, Mitra Saptamī 2037 falls on Sunday 13 December. Saptamī runs from 01:18 on Sun 13 Dec to 03:29 on Mon 14 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/ekadashi?on=2037-12-18", "festival": "ekadashi", "name": "Mokṣadā Ekādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-18", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 14859, "anga": { "type": "tithi", "index": 10, "key": "ekadashi", "name": "Ekādaśī", "start": { "local": "2037-12-17T10:52:39+02:00", "utc": "2037-12-17T08:52:39Z", "ms": 2144652758854.4648 }, "end": { "local": "2037-12-18T12:53:21+02:00", "utc": "2037-12-18T10:53:21Z", "ms": 2144746400907.002 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-17T10:52:39+02:00", "utc": "2037-12-17T08:52:39Z", "ms": 2144652758854.4648 }, "end": { "local": "2037-12-18T12:53:21+02:00", "utc": "2037-12-18T10:53:21Z", "ms": 2144746400907.002 } }, "kaala": "sunrise", "days": [ { "local_date": "2037-12-17", "window": { "start": { "local": "2037-12-17T06:45:00+02:00", "utc": "2037-12-17T04:45:00Z", "ms": 2144637899605.3745 }, "end": { "local": "2037-12-17T06:45:00+02:00", "utc": "2037-12-17T04:45:00Z", "ms": 2144637899605.3745 } }, "covered_min": 0, "window_min": 0, "qualifies": false }, { "local_date": "2037-12-18", "window": { "start": { "local": "2037-12-18T06:45:34+02:00", "utc": "2037-12-18T04:45:34Z", "ms": 2144724334004.807 }, "end": { "local": "2037-12-18T06:45:34+02:00", "utc": "2037-12-18T04:45:34Z", "ms": 2144724334004.807 } }, "covered_min": 1, "window_min": 0, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Ekādaśī runs from 10:53 on Thu 17 Dec to 12:53 on Fri 18 Dec.", "fact": "2037-12-17T08:52:39Z → 2037-12-18T10:53:21Z" }, { "step": "kaala", "text": "Sunrise is at 06:45 on the 17th and 06:46 on the 18th.", "fact": "sunrise: upper limb, 31′ + 16′" }, { "step": "rule", "text": "Ekādaśī must be current at sunrise. It is not on the 17th and is on the 18th.", "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 14859 s" }, { "step": "ruling", "text": "Mokṣadā Ekādaśī, Giza, 2037: Friday 18 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": "2037-12-18", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-18", "confidence": "determinate" } ], "quote": "In Giza, Mokṣadā Ekādaśī 2037 falls on Friday 18 December. Ekādaśī runs from 10:53 on Thu 17 Dec to 12:53 on Fri 18 Dec and is current at sunrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/ekadashi?on=2037-12-18", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/akhanda-dvadashi", "festival": "akhanda-dvadashi", "name": "Akhaṇḍa Dvādaśī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 2250, "anga": { "type": "tithi", "index": 11, "key": "dvadashi", "name": "Dvādaśī", "start": { "local": "2037-12-18T12:53:21+02:00", "utc": "2037-12-18T10:53:21Z", "ms": 2144746400907.002 }, "end": { "local": "2037-12-19T14:24:41+02:00", "utc": "2037-12-19T12:24:41Z", "ms": 2144838281432.3545 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-18T12:53:21+02:00", "utc": "2037-12-18T10:53:21Z", "ms": 2144746400907.002 }, "end": { "local": "2037-12-19T14:24:41+02:00", "utc": "2037-12-19T12:24:41Z", "ms": 2144838281432.3545 } }, "kaala": "madhyahna", "days": [ { "local_date": "2037-12-18", "window": { "start": { "local": "2037-12-18T11:27:50+02:00", "utc": "2037-12-18T09:27:50Z", "ms": 2144741270419.1926 }, "end": { "local": "2037-12-18T12:15:50+02:00", "utc": "2037-12-18T10:15:50Z", "ms": 2144744150419.1926 } }, "covered_min": 0, "window_min": 48, "qualifies": false }, { "local_date": "2037-12-19", "window": { "start": { "local": "2037-12-19T11:28:20+02:00", "utc": "2037-12-19T09:28:20Z", "ms": 2144827700217.8877 }, "end": { "local": "2037-12-19T12:16:20+02:00", "utc": "2037-12-19T10:16:20Z", "ms": 2144830580217.8877 } }, "covered_min": 48, "window_min": 48, "qualifies": true } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Dvādaśī runs from 12:53 on Fri 18 Dec to 14:25 on Sat 19 Dec.", "fact": "2037-12-18T10:53:21Z → 2037-12-19T12:24:41Z" }, { "step": "kaala", "text": "Madhyāhna is 1 ghaṭikā either side of midday: 11:28–12:16 on the 18th, 11:28–12:16 on the 19th.", "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 18th and 48 of 48 on the 19th.", "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 2250 s" }, { "step": "ruling", "text": "Akhaṇḍa Dvādaśī, Giza, 2037: Saturday 19 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": "2037-12-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-19", "confidence": "boundary" } ], "quote": "In Giza, Akhaṇḍa Dvādaśī 2037 falls on Saturday 19 December. Dvādaśī runs from 12:53 on Fri 18 Dec to 14:25 on Sat 19 Dec and covers all of madhyāhna that midday.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/pradosha-vrata?on=2037-12-19", "festival": "pradosha-vrata", "name": "Śukla Pradoṣa Vrata", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-19", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 5779, "anga": { "type": "tithi", "index": 12, "key": "trayodashi", "name": "Trayodaśī", "start": { "local": "2037-12-19T14:24:41+02:00", "utc": "2037-12-19T12:24:41Z", "ms": 2144838281432.3545 }, "end": { "local": "2037-12-20T15:22:42+02:00", "utc": "2037-12-20T13:22:42Z", "ms": 2144928162055.9055 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-19T14:24:41+02:00", "utc": "2037-12-19T12:24:41Z", "ms": 2144838281432.3545 }, "end": { "local": "2037-12-20T15:22:42+02:00", "utc": "2037-12-20T13:22:42Z", "ms": 2144928162055.9055 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-12-19", "window": { "start": { "local": "2037-12-19T16:58:33+02:00", "utc": "2037-12-19T14:58:33Z", "ms": 2144847513203.461 }, "end": { "local": "2037-12-19T18:48:58+02:00", "utc": "2037-12-19T16:48:58Z", "ms": 2144854138010.0657 } }, "covered_min": 110, "window_min": 110, "qualifies": true }, { "local_date": "2037-12-20", "window": { "start": { "local": "2037-12-20T16:59:01+02:00", "utc": "2037-12-20T14:59:01Z", "ms": 2144933940976.3972 }, "end": { "local": "2037-12-20T18:49:26+02:00", "utc": "2037-12-20T16:49:26Z", "ms": 2144940566184.0303 } }, "covered_min": 0, "window_min": 110, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Trayodaśī runs from 14:25 on Sat 19 Dec to 15:23 on Sun 20 Dec.", "fact": "2037-12-19T12:24:41Z → 2037-12-20T13:22:42Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 16:59–18:49 on the 19th, 16:59–18:49 on the 20th.", "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 19th and 0 of 110 on the 20th.", "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 5779 s" }, { "step": "ruling", "text": "Śukla Pradoṣa Vrata, Giza, 2037: Saturday 19 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": "2037-12-19", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-19", "confidence": "determinate" } ], "quote": "In Giza, Śukla Pradoṣa Vrata 2037 falls on Saturday 19 December. Trayodaśī runs from 14:25 on Sat 19 Dec to 15:23 on Sun 20 Dec and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/pradosha-vrata?on=2037-12-19", "method": "pac-rp@2026.1", "engine": { "version": "0.1.0", "ruleset": "2026.3-draft", "kernel": "de440-1900-2100", "kernel_sha256": "7eef444f9e5bd8786b8b5b72e775ecc376991b953a6246ec7a49d2c37434ea74", "tzdata": "2026f" } }, { "id": "/giza/festivals/2037/dattatreyotpatti", "festival": "dattatreyotpatti", "name": "Dattātreyotpatti", "everyday": "Datta Jayanti", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-21", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 4365, "anga": { "type": "tithi", "index": 14, "key": "purnima", "name": "Pūrṇimā", "start": { "local": "2037-12-21T15:46:45+02:00", "utc": "2037-12-21T13:46:45Z", "ms": 2145016004877.27 }, "end": { "local": "2037-12-22T15:38:41+02:00", "utc": "2037-12-22T13:38:41Z", "ms": 2145101921248.4924 }, "month": { "amanta": 8, "purnimanta": 8, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Mārgaśīrṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-21T15:46:45+02:00", "utc": "2037-12-21T13:46:45Z", "ms": 2145016004877.27 }, "end": { "local": "2037-12-22T15:38:41+02:00", "utc": "2037-12-22T13:38:41Z", "ms": 2145101921248.4924 } }, "kaala": "pradosha", "days": [ { "local_date": "2037-12-21", "window": { "start": { "local": "2037-12-21T16:59:30+02:00", "utc": "2037-12-21T14:59:30Z", "ms": 2145020370123.2253 }, "end": { "local": "2037-12-21T18:49:55+02:00", "utc": "2037-12-21T16:49:55Z", "ms": 2145026995379.1602 } }, "covered_min": 110, "window_min": 110, "qualifies": true }, { "local_date": "2037-12-22", "window": { "start": { "local": "2037-12-22T17:00:01+02:00", "utc": "2037-12-22T15:00:01Z", "ms": 2145106800613.993 }, "end": { "local": "2037-12-22T18:50:26+02:00", "utc": "2037-12-22T16:50:26Z", "ms": 2145113425565.506 } }, "covered_min": 0, "window_min": 110, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Pūrṇimā runs from 15:47 on Mon 21 Dec to 15:39 on Tue 22 Dec.", "fact": "2037-12-21T13:46:45Z → 2037-12-22T13:38:41Z" }, { "step": "kaala", "text": "Pradoṣa is 2 muhūrtas after sunset: 17:00–18:50 on the 21st, 17:00–18:50 on the 22nd.", "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 21st and 0 of 110 on the 22nd.", "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 4365 s" }, { "step": "ruling", "text": "Dattātreyotpatti, Giza, 2037: Monday 21 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": "2037-12-21", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-21", "confidence": "determinate" } ], "quote": "In Giza, Dattātreyotpatti (Datta Jayanti) 2037 falls on Monday 21 December. Pūrṇimā runs from 15:47 on Mon 21 Dec to 15:39 on Tue 22 Dec and covers all of pradoṣa that evening.", "cite": "https://ahargana.org/giza/festivals/2037/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": "/giza/festivals/2037/sankashta-chaturthi?on=2037-12-25", "festival": "sankashta-chaturthi", "name": "Saṅkaṣṭa Caturthī", "tradition": "smarta", "place": "360995", "year": 2037, "local_date": "2037-12-25", "confidence": "determinate", "boundary_reasons": [], "boundary_margin_s": 26660, "anga": { "type": "tithi", "index": 18, "key": "chaturthi", "name": "Caturthī", "start": { "local": "2037-12-25T12:39:17+02:00", "utc": "2037-12-25T10:39:17Z", "ms": 2145350356968.7573 }, "end": { "local": "2037-12-26T11:01:51+02:00", "utc": "2037-12-26T09:01:51Z", "ms": 2145430911267.037 }, "month": { "amanta": 8, "purnimanta": 9, "adhika": false, "amanta_name": "Mārgaśīrṣa", "purnimanta_name": "Pauṣa" } }, "span": { "of": "tithi", "start": { "local": "2037-12-25T12:39:17+02:00", "utc": "2037-12-25T10:39:17Z", "ms": 2145350356968.7573 }, "end": { "local": "2037-12-26T11:01:51+02:00", "utc": "2037-12-26T09:01:51Z", "ms": 2145430911267.037 } }, "kaala": "moonrise", "days": [ { "local_date": "2037-12-25", "window": { "start": { "local": "2037-12-25T20:03:37+02:00", "utc": "2037-12-25T18:03:37Z", "ms": 2145377017339.1492 }, "end": { "local": "2037-12-25T20:03:37+02:00", "utc": "2037-12-25T18:03:37Z", "ms": 2145377017339.1492 } }, "covered_min": 1, "window_min": 0, "qualifies": true }, { "local_date": "2037-12-26", "window": { "start": { "local": "2037-12-26T21:07:52+02:00", "utc": "2037-12-26T19:07:52Z", "ms": 2145467272075.2327 }, "end": { "local": "2037-12-26T21:07:52+02:00", "utc": "2037-12-26T19:07:52Z", "ms": 2145467272075.2327 } }, "covered_min": 0, "window_min": 0, "qualifies": false } ], "decided_by": "only-day", "explanation": [ { "step": "anga", "text": "Caturthī runs from 12:39 on Fri 25 Dec to 11:02 on Sat 26 Dec.", "fact": "2037-12-25T10:39:17Z → 2037-12-26T09:01:51Z" }, { "step": "kaala", "text": "Moonrise is at 20:04 on the 25th and 21:08 on the 26th.", "fact": "moonrise: disc centre, 31′" }, { "step": "rule", "text": "Caturthī must be current at moonrise. It is on the 25th and is not on the 26th.", "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 26660 s" }, { "step": "ruling", "text": "Saṅkaṣṭa Caturthī, Giza, 2037: Friday 25 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": "2037-12-25", "confidence": "determinate" }, { "kind": "profile", "profile": "compat-drikpanchang@2026.1", "local_date": "2037-12-25", "confidence": "determinate" } ], "quote": "In Giza, Saṅkaṣṭa Caturthī 2037 falls on Friday 25 December. Caturthī runs from 12:39 on Fri 25 Dec to 11:02 on Sat 26 Dec and is current at moonrise that day.", "cite": "https://ahargana.org/giza/festivals/2037/sankashta-chaturthi?on=2037-12-25", "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" } }