Ruling · Śiva Śayanotsava · 2002

Tuesday 23 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 134 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two evenings

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

Evening of Tuesday 23 July

Taken. The only evening Pūrṇimā reaches.

sunset 19:23  20:33 pradoṣa ends
18:3518:5919:2319:4720:1120:3520:5921:23

70 of 70 minutes covered

Evening of Wednesday 24 July

Pūrṇimā is absent from pradoṣa. Not taken.

sunset 19:21  20:32 pradoṣa ends
18:3318:5719:2119:4520:0920:3320:5721:21

0 of 71 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 16:58 on Tue 23 Jul to 17:07 on Wed 24 Jul.

    2002-07-23T08:57:56Z → 2002-07-24T09:07:00Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:23–20:33 on the 23rd, 19:21–20:32 on the 24th.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 70 of 70 minutes on the 23rd and 0 of 71 on the 24th.

    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 8067 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daqing, 2002: Tuesday 23 July.

    confidence: determinate

Say it like this

In Daqing, Śiva Śayanotsava 2002 falls on Tuesday 23 July. Pūrṇimā runs from 16:58 on Tue 23 Jul to 17:07 on Wed 24 Jul and covers all of pradoṣa that evening.

ahargana.org/daqing/festivals/2002/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 23 Jul
Ahargaṇa, classicalDisc centre, no refractionTue 23 Jul
compat-drikpanchangComparison profileTue 23 Jul
No institution has a recorded ruling for Daqing.

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 23rdCoveredSunset 24thCoveredRuled
Los Angeles01:58 → 02:0720:0080 min20:000 min23 Jul
Chicago03:58 → 04:0720:1875 min20:170 min23 Jul
Jersey City04:58 → 05:0720:2075 min20:190 min23 Jul
Port of Spain04:58 → 05:0718:3291 min18:310 min23 Jul
London09:58 → 10:0721:0265 min21:010 min23 Jul
Durban10:58 → 11:0717:18108 min17:190 min23 Jul
Dubai12:58 → 13:0719:0885 min19:080 min23 Jul
Delhi14:28 → 14:3719:1783 min19:170 min23 Jul
Kolkata14:28 → 14:3718:2286 min18:210 min23 Jul
Singapore16:58 → 17:0719:1695 min19:160 min23 Jul
Sydney18:58 → 19:0717:091 min17:10110 min24 Jul
Suva20:58 → 21:0717:490 min17:49102 min24 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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