Ruling · Śiva Śayanotsava · 1987

Friday 10 July

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 257 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Friday 10 July

Taken. The only evening Pūrṇimā reaches.

20:45 sunsetpradoṣa ends 21:59
20:2120:4521:0921:3321:5722:2122:45

74 of 74 minutes covered

Evening of Saturday 11 July

Pūrṇimā is absent from pradoṣa. Not taken.

20:45 sunsetpradoṣa ends 21:59
20:2120:4521:0921:3321:5722:2122:45

0 of 74 minutes covered

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 16:28 on Fri 10 Jul to 12:33 on Sat 11 Jul.

    1987-07-10T07:27:47Z → 1987-07-11T03:32:37Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 20:45–21:59 on the 10th, 20:45–21:59 on the 11th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 74 of 74 minutes on the 10th and 0 of 74 on the 11th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Only one evening qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 15441 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 1987: Friday 10 July.

    confidence: determinate

Say it like this

In Baoding, Śiva Śayanotsava 1987 falls on Friday 10 July. Pūrṇimā runs from 16:28 on Fri 10 Jul to 12:33 on Sat 11 Jul and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1987/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 10 Jul
Ahargaṇa, classicalDisc centre, no refractionFri 10 Jul
compat-drikpanchangComparison profileFri 10 Jul
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/shiva-shayanotsava · ruleset 2026.3-draft

Month
Āṣāḍha, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 102

“S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāSunset 10thCoveredSunset 11thCoveredRuled
Los Angeles00:28 → 20:3320:0726 min20:060 min10 Jul
Chicago02:28 → 22:3320:2772 min20:260 min10 Jul
Jersey City03:28 → 23:3320:2973 min20:280 min10 Jul
Port of Spain03:28 → 23:3318:3390 min18:330 min10 Jul
London08:28 → 04:3321:1661 min21:150 min10 Jul
Durban09:28 → 05:3317:11109 min17:110 min10 Jul
Dubai11:28 → 07:3319:1283 min19:120 min10 Jul
Delhi12:58 → 09:0319:2281 min19:220 min10 Jul
Kolkata12:58 → 09:0318:2585 min18:250 min10 Jul
Singapore15:28 → 11:3319:1595 min19:150 min10 Jul
Sydney17:28 → 13:3317:0185 min17:010 min10 Jul
Suva19:28 → 15:3317:440 min17:450 min10 Jul
Profile · tradition
pac-rp@2026.1 · smarta
Rule
shiva-shayanotsava@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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