Ruling · Śiva Śayanotsava · 2015

Thursday 30 July

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

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Thursday 30 July

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

19:32 sunsetpradoṣa ends 20:50
Pūrṇimā begins 21:30:51
19:0819:3219:5620:2020:4421:0821:32

0 of 78 minutes covered

Evening of Friday 31 July

Pūrṇimā is absent from pradoṣa. Not taken.

19:31 sunsetpradoṣa ends 20:49
19:0719:3119:5520:1920:4321:0721:31

0 of 78 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 21:31 on Thu 30 Jul to 18:43 on Fri 31 Jul.

    2015-07-30T13:30:51Z → 2015-07-31T10:42:54Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:32–20:50 on the 30th, 19:31–20:49 on the 31st.

    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 78 minutes on the 30th and 0 of 78 on the 31st.

    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 2462 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 2015: Thursday 30 July.

    confidence: boundary (absent-unstated)

Say it like this

In Baoding, Śiva Śayanotsava 2015 falls on Thursday 30 July. Pūrṇimā runs from 21:31 on Thu 30 Jul to 18:43 on Fri 31 Jul, and reaches pradoṣa on neither day.

ahargana.org/baoding/festivals/2015/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 30 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 30 Jul
compat-drikpanchangComparison profileThu 30 Jul
No institution has a recorded ruling for Baoding.

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 31stCoveredRuled
Los Angeles06:31 → 03:4319:5581 min19:550 min30 Jul
Chicago08:31 → 05:4320:1176 min20:100 min30 Jul
Jersey City09:31 → 06:4320:1477 min20:130 min30 Jul
Port of Spain09:31 → 06:4318:3091 min18:300 min30 Jul
London14:31 → 11:4320:5268 min20:500 min30 Jul
Durban15:31 → 12:4317:22107 min17:230 min30 Jul
Dubai17:31 → 14:4319:0585 min19:040 min30 Jul
Delhi19:01 → 16:1319:1384 min19:130 min30 Jul
Kolkata19:01 → 16:1318:1944 min18:180 min30 Jul
Singapore21:31 → 18:4319:160 min19:160 min30 Jul
Sydney23:31 → 20:4317:140 min17:14109 min31 Jul
Suva01:31 → 22:4317:510 min17:51102 min31 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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