Ruling · Śiva Śayanotsava · 2057

Sunday 15 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 Sunday 15 July

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

19:43 sunsetpradoṣa ends 20:58
Pūrṇimā begins 21:00:13
19:1919:4320:0720:3120:5521:1921:43

0 of 75 minutes covered

Evening of Monday 16 July

Pūrṇimā is absent from pradoṣa. Not taken.

19:42 sunsetpradoṣa ends 20:57
19:1819:4220:0620:3020:5421:1821:42

0 of 75 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 21:00 on Sun 15 Jul to 17:29 on Mon 16 Jul.

    2057-07-15T13:00:14Z → 2057-07-16T09:28:40Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:43–20:58 on the 15th, 19:42–20:57 on the 16th.

    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 75 minutes on the 15th and 0 of 75 on the 16th.

    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 149 s < 300 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 2057: Sunday 15 July.

    confidence: boundary (margin, absent-unstated)

Say it like this

In Baoding, Śiva Śayanotsava 2057 falls on Sunday 15 July. Pūrṇimā runs from 21:00 on Sun 15 Jul to 17:29 on Mon 16 Jul, and reaches pradoṣa on neither day. It is 2 min 29 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2057/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 15 Jul
Ahargaṇa, classicalDisc centre, no refractionSun 15 Jul
compat-drikpanchangComparison profileSun 15 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 15thCoveredSunset 16thCoveredRuled
Los Angeles06:00 → 02:2920:0579 min20:040 min15 Jul
Chicago08:00 → 04:2920:2373 min20:230 min15 Jul
Jersey City09:00 → 05:2920:2674 min20:250 min15 Jul
Port of Spain09:00 → 05:2918:3391 min18:330 min15 Jul
London14:00 → 10:2921:1163 min21:100 min15 Jul
Durban15:00 → 11:2917:14109 min17:150 min15 Jul
Dubai17:00 → 13:2919:1184 min19:110 min15 Jul
Delhi18:30 → 14:5919:2182 min19:200 min15 Jul
Kolkata18:30 → 14:5918:2479 min18:240 min15 Jul
Singapore21:00 → 17:2919:160 min19:160 min15 Jul
Sydney23:00 → 19:2917:040 min17:05111 min16 Jul
Suva01:00 → 21:2917:470 min17:47103 min16 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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