Ruling · Śiva Śayanotsava · 1980

Sunday 27 July

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 362 minutes.

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 Saturday 26 July

Pūrṇimā is absent from pradoṣa. Not taken.

19:35 sunsetpradoṣa ends 20:52
19:1119:3519:5920:2320:4721:1121:35

0 of 77 minutes covered

Evening of Sunday 27 July

Taken. The only evening Pūrṇimā reaches.

19:34 sunsetpradoṣa ends 20:51
19:1019:3419:5820:2220:4621:1021:34

78 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 04:43 on Sun 27 Jul to 02:54 on Mon 28 Jul.

    1980-07-26T20:43:16Z → 1980-07-27T18:53:38Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:35–20:52 on the 26th, 19:34–20:51 on the 27th.

    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 77 minutes on the 26th and 78 of 78 on the 27th.

    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 21729 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 1980: Sunday 27 July.

    confidence: determinate

Say it like this

In Baoding, Śiva Śayanotsava 1980 falls on Sunday 27 July. Pūrṇimā runs from 04:43 on Sun 27 Jul to 02:54 on Mon 28 Jul and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1980/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 27 Jul
Ahargaṇa, classicalDisc centre, no refractionSun 27 Jul
compat-drikpanchangComparison profileSun 27 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 26thCoveredSunset 27thCoveredRuled
Los Angeles13:43 → 11:5419:5880 min19:570 min26 Jul
Chicago15:43 → 13:5420:1475 min20:140 min26 Jul
Jersey City16:43 → 14:5420:1776 min20:160 min26 Jul
Port of Spain16:43 → 14:5418:3191 min18:310 min26 Jul
London21:43 → 19:5420:5721 min20:560 min26 Jul
Durban22:43 → 20:5417:200 min17:20107 min27 Jul
Dubai00:43 → 22:5419:070 min19:0685 min27 Jul
Delhi02:13 → 00:2419:160 min19:1583 min27 Jul
Kolkata02:13 → 00:2418:200 min18:2086 min27 Jul
Singapore04:13 → 02:2418:460 min18:4695 min27 Jul
Sydney06:43 → 04:5417:110 min17:12109 min27 Jul
Suva08:43 → 06:5417:500 min17:50102 min27 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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