Ruling · Śiva Śayanotsava · 1901

Monday 1 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 593 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 Sunday 30 June

Pūrṇimā is absent from pradoṣa. Not taken.

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

0 of 66 minutes covered

Evening of Monday 1 July

Taken. The only evening Pūrṇimā reaches.

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

66 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 06:35 on Mon 1 Jul to 07:18 on Tue 2 Jul.

    1901-06-30T22:35:24Z → 1901-07-01T23:17:38Z

  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 0 of 66 minutes on the 30th and 66 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 35578 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daqing, 1901: Monday 1 July.

    confidence: determinate

Say it like this

In Daqing, Śiva Śayanotsava 1901 falls on Monday 1 July. Pūrṇimā runs from 06:35 on Mon 1 Jul to 07:18 on Tue 2 Jul and covers all of pradoṣa that evening.

ahargana.org/daqing/festivals/1901/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 1 Jul
Ahargaṇa, classicalDisc centre, no refractionMon 1 Jul
compat-drikpanchangComparison profileMon 1 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 30thCoveredSunset 1stCoveredRuled
Los Angeles14:35 → 15:1819:0877 min19:080 min30 Jun
Chicago16:35 → 17:1819:2971 min19:290 min30 Jun
Jersey City17:35 → 18:1819:3172 min19:310 min30 Jun
Port of Spain18:35 → 19:1818:3186 min18:3246 min30 Jun
London22:35 → 23:1820:210 min20:2160 min1 Jul
Durban00:05 → 00:4816:360 min16:37110 min1 Jul
Dubai02:16 → 02:5918:530 min18:5383 min1 Jul
Delhi03:56 → 04:3919:140 min19:1481 min1 Jul
Kolkata03:56 → 04:3918:160 min18:1684 min1 Jul
Singapore05:30 → 06:1318:080 min18:0995 min1 Jul
Sydney08:35 → 09:1816:560 min16:56113 min1 Jul
Suva10:30 → 11:1317:360 min17:36104 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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