Ruling · Śiva Śayanotsava · 1986

Sunday 20 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 20 July

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

20:40 sunsetpradoṣa ends 21:56
20:1620:4021:0421:2821:5222:1622:40

0 of 76 minutes covered

Evening of Monday 21 July

Pūrṇimā is absent from pradoṣa. Not taken.

20:39 sunsetpradoṣa ends 21:55
20:1520:3921:0321:2721:5122:1522:39

0 of 76 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 23:04 on Sun 20 Jul to 19:40 on Mon 21 Jul.

    1986-07-20T14:03:33Z → 1986-07-21T10:40:12Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 20:40–21:56 on the 20th, 20:39–21:55 on the 21st.

    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 76 minutes on the 20th and 0 of 76 on the 21st.

    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 3533 s

  5. 05

    Ruling

    Śiva Śayanotsava, Baoding, 1986: Sunday 20 July.

    confidence: boundary (absent-unstated)

Say it like this

In Baoding, Śiva Śayanotsava 1986 falls on Sunday 20 July. Pūrṇimā runs from 23:04 on Sun 20 Jul to 19:40 on Mon 21 Jul, and reaches pradoṣa on neither day.

ahargana.org/baoding/festivals/1986/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 20 Jul
Ahargaṇa, classicalDisc centre, no refractionSun 20 Jul
compat-drikpanchangComparison profileSun 20 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 20thCoveredSunset 21stCoveredRuled
Los Angeles07:04 → 03:4020:0279 min20:020 min20 Jul
Chicago09:04 → 05:4020:2074 min20:190 min20 Jul
Jersey City10:04 → 06:4020:2375 min20:220 min20 Jul
Port of Spain10:04 → 06:4018:3291 min18:320 min20 Jul
London15:04 → 11:4021:0664 min21:050 min20 Jul
Durban16:04 → 12:4017:16108 min17:170 min20 Jul
Dubai18:04 → 14:4019:0984 min19:090 min20 Jul
Delhi19:34 → 16:1019:1968 min19:180 min20 Jul
Kolkata19:34 → 16:1018:2314 min18:220 min20 Jul
Singapore22:04 → 18:4019:160 min19:160 min20 Jul
Sydney00:04 → 20:4017:070 min17:07110 min21 Jul
Suva02:04 → 22:4017:480 min17:48103 min21 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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