Ruling · Śiva Śayanotsava · 2048

Friday 24 July

Boundaryin Daqing, under the Rashtriya Panchang method. Pūrṇimā reaches pradoṣa on neither day and the rule does not say what then. Say “contested”.

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 Friday 24 July

Taken. Pūrṇimā reaches neither evening; this is the day it falls on.

sunset 19:21  20:32 pradoṣa ends
Pūrṇimā begins 20:45:40
18:3318:5719:2119:4520:0920:3320:5721:21

0 of 71 minutes covered

Evening of Saturday 25 July

Pūrṇimā is absent from pradoṣa. Not taken.

sunset 19:19  20:31 pradoṣa ends
18:3118:5519:1919:4320:0720:3120:5521:19

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 20:46 on Fri 24 Jul to 17:34 on Sat 25 Jul.

    2048-07-24T12:45:40Z → 2048-07-25T09:34:00Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:21–20:32 on the 24th, 19:19–20:31 on the 25th.

    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 71 minutes on the 24th and 0 of 71 on the 25th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Neither evening qualifies. The day the tithi falls on is taken.

    priority: unstated → tithi-day · margin 845 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daqing, 2048: Friday 24 July.

    confidence: boundary (absent-unstated)

Say it like this

In Daqing, Śiva Śayanotsava 2048 falls on Friday 24 July. Pūrṇimā runs from 20:46 on Fri 24 Jul to 17:34 on Sat 25 Jul, and reaches pradoṣa on neither day.

ahargana.org/daqing/festivals/2048/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 24 Jul
Ahargaṇa, classicalDisc centre, no refractionFri 24 Jul
compat-drikpanchangComparison profileFri 24 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 24thCoveredSunset 25thCoveredRuled
Los Angeles05:46 → 02:3419:5980 min19:580 min24 Jul
Chicago07:46 → 04:3420:1675 min20:150 min24 Jul
Jersey City08:46 → 05:3420:1976 min20:180 min24 Jul
Port of Spain08:46 → 05:3418:3191 min18:310 min24 Jul
London13:46 → 10:3420:5966 min20:580 min24 Jul
Durban14:46 → 11:3417:19108 min17:200 min24 Jul
Dubai16:46 → 13:3419:0885 min19:070 min24 Jul
Delhi18:16 → 15:0419:1783 min19:160 min24 Jul
Kolkata18:16 → 15:0418:2186 min18:210 min24 Jul
Singapore20:46 → 17:3419:165 min19:160 min24 Jul
Sydney22:46 → 19:3417:100 min17:11109 min25 Jul
Suva00:46 → 21:3417:500 min17:50102 min25 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

About Ahargaṇa