Ruling · Śiva Śayanotsava · 1913

Thursday 17 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 322 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 17 July

Taken. The only evening Pūrṇimā reaches.

sunset 19:28  20:37 pradoṣa ends
18:4019:0419:2819:5220:1620:4021:0421:28

69 of 69 minutes covered

Evening of Friday 18 July

Pūrṇimā is absent from pradoṣa. Not taken.

sunset 19:28  20:37 pradoṣa ends
18:4019:0419:2819:5220:1620:4021:0421:28

0 of 69 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 13:15 on Thu 17 Jul to 14:06 on Fri 18 Jul.

    1913-07-17T05:14:40Z → 1913-07-18T06:05:58Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:28–20:37 on the 17th, 19:28–20:37 on the 18th.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 69 of 69 minutes on the 17th and 0 of 69 on the 18th.

    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 19300 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daqing, 1913: Thursday 17 July.

    confidence: determinate

Say it like this

In Daqing, Śiva Śayanotsava 1913 falls on Thursday 17 July. Pūrṇimā runs from 13:15 on Thu 17 Jul to 14:06 on Fri 18 Jul and covers all of pradoṣa that evening.

ahargana.org/daqing/festivals/1913/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 17 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 17 Jul
compat-drikpanchangComparison profileThu 17 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 17thCoveredSunset 18thCoveredRuled
Los Angeles21:15 → 22:0619:0479 min19:030 min17 Jul
Chicago23:15 → 00:0619:2373 min19:220 min17 Jul
Jersey City00:15 → 01:0619:2574 min19:240 min17 Jul
Port of Spain01:15 → 02:0618:3291 min18:320 min17 Jul
London05:15 → 06:0620:1063 min20:080 min17 Jul
Durban07:15 → 08:0617:14109 min17:150 min17 Jul
Dubai08:56 → 09:4718:5184 min18:510 min17 Jul
Delhi10:45 → 11:3619:2082 min19:200 min17 Jul
Kolkata10:45 → 11:3618:2385 min18:230 min17 Jul
Singapore12:15 → 13:0618:1695 min18:160 min17 Jul
Sydney15:15 → 16:0617:05111 min17:050 min17 Jul
Suva17:10 → 18:0117:41103 min17:4219 min17 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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