Ruling · Śiva Śayanotsava · 2011

Thursday 14 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 256 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 Thursday 14 July

Taken. The only evening Pūrṇimā reaches.

sunset 19:31  20:39 pradoṣa ends
18:4319:0719:3119:5520:1920:4321:0721:31

68 of 68 minutes covered

Evening of Friday 15 July

Pūrṇimā is absent from pradoṣa. Not taken.

sunset 19:30  20:38 pradoṣa ends
18:4219:0619:3019:5420:1820:4221:0621:30

0 of 68 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 15:15 on Thu 14 Jul to 14:40 on Fri 15 Jul.

    2011-07-14T07:14:48Z → 2011-07-15T06:39:37Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:31–20:39 on the 14th, 19:30–20:38 on the 15th.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 68 of 68 minutes on the 14th and 0 of 68 on the 15th.

    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 15354 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daqing, 2011: Thursday 14 July.

    confidence: determinate

Say it like this

In Daqing, Śiva Śayanotsava 2011 falls on Thursday 14 July. Pūrṇimā runs from 15:15 on Thu 14 Jul to 14:40 on Fri 15 Jul and covers all of pradoṣa that evening.

ahargana.org/daqing/festivals/2011/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 14 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 14 Jul
compat-drikpanchangComparison profileThu 14 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 14thCoveredSunset 15thCoveredRuled
Los Angeles00:15 → 23:4020:0578 min20:050 min14 Jul
Chicago02:15 → 01:4020:2473 min20:240 min14 Jul
Jersey City03:15 → 02:4020:2774 min20:260 min14 Jul
Port of Spain03:15 → 02:4018:3391 min18:320 min14 Jul
London08:15 → 07:4021:1262 min21:110 min14 Jul
Durban09:15 → 08:4017:13109 min17:140 min14 Jul
Dubai11:15 → 10:4019:1184 min19:110 min14 Jul
Delhi12:45 → 12:1019:2182 min19:210 min14 Jul
Kolkata12:45 → 12:1018:2485 min18:240 min14 Jul
Singapore15:15 → 14:4019:1695 min19:160 min14 Jul
Sydney17:15 → 16:4017:03100 min17:040 min14 Jul
Suva19:15 → 18:4017:4614 min17:4654 min15 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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