Ruling · Śiva Śayanotsava · 1920

Wednesday 30 June

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 176 minutes.

Decide it for

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 Wednesday 30 June

Taken. The only evening Pūrṇimā reaches.

sunset 19:37  20:42 pradoṣa ends
18:4919:1319:3720:0120:2520:4921:1321:37

66 of 66 minutes covered

Evening of Thursday 1 July

Pūrṇimā is absent from pradoṣa. Not taken.

sunset 19:36  20:42 pradoṣa ends
18:4819:1219:3620:0020:2420:4821:1221:36

0 of 66 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 14:15 on Wed 30 Jun to 16:40 on Thu 1 Jul.

    1920-06-30T06:14:56Z → 1920-07-01T08:40:20Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:37–20:42 on the 30th, 19:36–20:42 on the 1st.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 66 of 66 minutes on the 30th and 0 of 66 on the 1st.

    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 10567 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daqing, 1920: Wednesday 30 June.

    confidence: determinate

Say it like this

In Daqing, Śiva Śayanotsava 1920 falls on Wednesday 30 June. Pūrṇimā runs from 14:15 on Wed 30 Jun to 16:40 on Thu 1 Jul and covers all of pradoṣa that evening.

ahargana.org/daqing/festivals/1920/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 30 Jun
Ahargaṇa, classicalDisc centre, no refractionWed 30 Jun
compat-drikpanchangComparison profileWed 30 Jun
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 30thCoveredSunset 1stCoveredRuled
Los Angeles22:15 → 00:4019:0877 min19:080 min30 Jun
Chicago01:15 → 03:4020:2971 min20:290 min30 Jun
Jersey City02:15 → 04:4020:3172 min20:310 min30 Jun
Port of Spain02:15 → 04:4018:3190 min18:320 min30 Jun
London07:15 → 09:4021:2160 min21:200 min30 Jun
Durban08:15 → 10:4017:06110 min17:070 min30 Jun
Dubai10:15 → 12:4019:1283 min19:120 min30 Jun
Delhi11:45 → 14:1019:2381 min19:230 min30 Jun
Kolkata11:45 → 14:1018:2584 min18:250 min30 Jun
Singapore13:15 → 15:4018:1495 min18:140 min30 Jun
Sydney16:15 → 18:4016:56113 min16:56104 min30 Jun
Suva18:15 → 20:4017:4170 min17:41104 min1 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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