Ruling · Śiva Śayanotsava · 2086

Thursday 25 July

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 3 min 03 s away. 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 25 July

Taken. The only evening Pūrṇimā reaches.

19:36 sunsetpradoṣa ends 20:53
Pūrṇimā begins 19:38:50
19:1219:3620:0020:2420:4821:1221:36

74 of 77 minutes covered, the last 74

Evening of Friday 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

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 19:39 on Thu 25 Jul to 17:25 on Fri 26 Jul.

    2086-07-25T11:38:50Z → 2086-07-26T09:25:28Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:36–20:53 on the 25th, 19:35–20:52 on the 26th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 74 of 77 minutes on the 25th and 0 of 77 on the 26th.

    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 183 s < 300 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 2086: Thursday 25 July.

    confidence: boundary (margin)

Say it like this

In Baoding, Śiva Śayanotsava 2086 falls on Thursday 25 July. Pūrṇimā runs from 19:39 on Thu 25 Jul to 17:25 on Fri 26 Jul and covers 74 of 77 minutes of pradoṣa that evening. It is 3 min 03 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2086/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 25 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 25 Jul
compat-drikpanchangComparison profileThu 25 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 25thCoveredSunset 26thCoveredRuled
Los Angeles04:39 → 02:2519:5980 min19:580 min25 Jul
Chicago06:39 → 04:2520:1675 min20:150 min25 Jul
Jersey City07:39 → 05:2520:1876 min20:170 min25 Jul
Port of Spain07:39 → 05:2518:3291 min18:310 min25 Jul
London12:39 → 10:2520:5966 min20:570 min25 Jul
Durban13:39 → 11:2517:20107 min17:210 min25 Jul
Dubai15:39 → 13:2519:0785 min19:070 min25 Jul
Delhi17:09 → 14:5519:1683 min19:160 min25 Jul
Kolkata17:09 → 14:5518:2186 min18:200 min25 Jul
Singapore19:39 → 17:2519:1772 min19:170 min25 Jul
Sydney21:39 → 19:2517:110 min17:12109 min26 Jul
Suva23:39 → 21:2517:500 min17:50102 min26 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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