Ruling · Dattātreyotpatti (Datta Jayanti) · 2096

Friday 28 December

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 Friday 28 December

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

17:04 sunsetpradoṣa ends 19:00
16:4017:0417:2817:5218:1618:4019:0419:28

0 of 116 minutes covered

Evening of Saturday 29 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:05 sunsetpradoṣa ends 19:01
16:4117:0517:2917:5318:1718:4119:0519:29

0 of 116 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 20:01 on Fri 28 Dec to 16:25 on Sat 29 Dec.

    2096-12-28T12:00:37Z → 2096-12-29T08:25:00Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:04–19:00 on the 28th, 17:05–19:01 on the 29th.

    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 116 minutes on the 28th and 0 of 116 on the 29th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Neither evening qualifies. The day the tithi falls on is taken.

    priority: unstated → tithi-day · margin 2387 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2096: Friday 28 December.

    confidence: boundary (absent-unstated)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2096 falls on Friday 28 December. Pūrṇimā runs from 20:01 on Fri 28 Dec to 16:25 on Sat 29 Dec, and reaches pradoṣa on neither day.

ahargana.org/baoding/festivals/2096/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 28 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 28 Dec
compat-drikpanchangComparison profileFri 28 Dec
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/dattatreyotpatti · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 15 Dattatreyotpatti (pradosa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāSunset 28thCoveredSunset 29thCoveredRuled
Los Angeles04:01 → 00:2516:52113 min16:530 min28 Dec
Chicago06:01 → 02:2516:28119 min16:290 min28 Dec
Jersey City07:01 → 03:2516:37118 min16:380 min28 Dec
Port of Spain08:01 → 04:2517:53100 min17:540 min28 Dec
London12:01 → 08:2515:59129 min16:000 min28 Dec
Durban14:01 → 10:2518:5980 min18:590 min28 Dec
Dubai16:01 → 12:2517:39107 min17:390 min28 Dec
Delhi17:31 → 13:5517:33109 min17:340 min28 Dec
Kolkata17:31 → 13:5517:0177 min17:020 min28 Dec
Singapore20:01 → 16:2519:0843 min19:080 min28 Dec
Sydney23:01 → 19:2520:080 min20:090 min28 Dec
Suva00:01 → 20:2518:440 min18:4586 min29 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
dattatreyotpatti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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