Ruling · Śiva Śayanotsava · 1962

Monday 16 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 Monday 16 July

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

19:42 sunsetpradoṣa ends 20:57
Pūrṇimā begins 21:39:17
19:1819:4220:0620:3020:5421:1821:42

0 of 75 minutes covered

Evening of Tuesday 17 July

Pūrṇimā is absent from pradoṣa. Not taken.

19:42 sunsetpradoṣa ends 20:57
Pūrṇimā ends 19:40:31
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 21:39 on Mon 16 Jul to 19:41 on Tue 17 Jul.

    1962-07-16T13:39:18Z → 1962-07-17T11:40:32Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:42–20:57 on the 16th, 19:42–20:57 on the 17th.

    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 16th and 0 of 75 on the 17th.

    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 73 s < 300 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 1962: Monday 16 July.

    confidence: boundary (margin, absent-unstated)

Say it like this

In Baoding, Śiva Śayanotsava 1962 falls on Monday 16 July. Pūrṇimā runs from 21:39 on Mon 16 Jul to 19:41 on Tue 17 Jul, and reaches pradoṣa on neither day. It is 1 min 13 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1962/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 16 Jul
Ahargaṇa, classicalDisc centre, no refractionTue 17 Jul
compat-drikpanchangComparison profileMon 16 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 16thCoveredSunset 17thCoveredRuled
Los Angeles06:39 → 04:4120:0479 min20:040 min16 Jul
Chicago08:39 → 06:4120:2373 min20:230 min16 Jul
Jersey City09:39 → 07:4120:2674 min20:250 min16 Jul
Port of Spain09:39 → 07:4118:3291 min18:320 min16 Jul
London14:39 → 12:4121:1063 min21:090 min16 Jul
Durban15:39 → 13:4117:14109 min17:140 min16 Jul
Dubai17:39 → 15:4119:1184 min19:100 min16 Jul
Delhi19:09 → 17:1119:2082 min19:200 min16 Jul
Kolkata19:09 → 17:1118:2439 min18:230 min16 Jul
Singapore21:09 → 19:1118:460 min18:4625 min17 Jul
Sydney23:39 → 21:4117:040 min17:05111 min17 Jul
Suva01:39 → 23:4117:460 min17:47103 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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