Ruling · Dattātreyotpatti (Datta Jayanti) · 2034

Sunday 24 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 Sunday 24 December

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

17:01 sunsetpradoṣa ends 18:57
16:3717:0117:2517:4918:1318:3719:0119:25

0 of 117 minutes covered

Evening of Monday 25 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:01 sunsetpradoṣa ends 18:58
Pūrṇimā ends 16:54:31
16:3717:0117:2517:4918:1318:3719:0119:25

0 of 117 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 20:38 on Sun 24 Dec to 16:55 on Mon 25 Dec.

    2034-12-24T12:38:26Z → 2034-12-25T08:54:31Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:01–18:57 on the 24th, 17:01–18:58 on the 25th.

    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 117 minutes on the 24th and 0 of 117 on the 25th.

    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 401 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2034: Sunday 24 December.

    confidence: boundary (absent-unstated)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2034 falls on Sunday 24 December. Pūrṇimā runs from 20:38 on Sun 24 Dec to 16:55 on Mon 25 Dec, and reaches pradoṣa on neither day.

ahargana.org/baoding/festivals/2034/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 24 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 24 Dec
compat-drikpanchangComparison profileSun 24 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 24thCoveredSunset 25thCoveredRuled
Los Angeles04:38 → 00:5516:49113 min16:500 min24 Dec
Chicago06:38 → 02:5516:24119 min16:250 min24 Dec
Jersey City07:38 → 03:5516:33118 min16:340 min24 Dec
Port of Spain08:38 → 04:5517:51100 min17:510 min24 Dec
London12:38 → 08:5515:55129 min15:550 min24 Dec
Durban14:38 → 10:5518:5780 min18:580 min24 Dec
Dubai16:38 → 12:5517:35107 min17:360 min24 Dec
Delhi18:08 → 14:2517:3071 min17:300 min24 Dec
Kolkata18:08 → 14:2516:5836 min16:590 min24 Dec
Singapore20:38 → 16:5519:053 min19:060 min24 Dec
Sydney23:38 → 19:5520:070 min20:070 min24 Dec
Suva00:38 → 20:5518:420 min18:4286 min25 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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