Ruling · Dattātreyotpatti (Datta Jayanti) · 1931

Thursday 24 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 577 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 Thursday 24 December

Taken. The only evening Pūrṇimā reaches.

17:00 sunsetpradoṣa ends 18:57
16:3617:0017:2417:4818:1218:3619:0019:24

117 of 117 minutes covered

Evening of Friday 25 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:01 sunsetpradoṣa ends 18:57
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 07:22 on Thu 24 Dec to 07:23 on Fri 25 Dec.

    1931-12-23T23:21:40Z → 1931-12-24T23:23:25Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:00–18:57 on the 24th, 17:01–18:57 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 117 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

    Only one evening qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 34640 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1931: Thursday 24 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1931 falls on Thursday 24 December. Pūrṇimā runs from 07:22 on Thu 24 Dec to 07:23 on Fri 25 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1931/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 24 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 24 Dec
compat-drikpanchangComparison profileThu 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 23rdCoveredSunset 24thCoveredRuled
Los Angeles15:22 → 15:2316:48113 min16:490 min23 Dec
Chicago17:22 → 17:2316:2361 min16:2460 min23 Dec
Jersey City18:22 → 18:2316:329 min16:33110 min24 Dec
Port of Spain19:22 → 19:2317:508 min17:5093 min24 Dec
London23:22 → 23:2315:540 min15:54130 min24 Dec
Durban01:22 → 01:2318:570 min18:5780 min24 Dec
Dubai03:22 → 03:2317:350 min17:35107 min24 Dec
Delhi04:52 → 04:5317:290 min17:30110 min24 Dec
Kolkata04:52 → 04:5316:580 min16:58106 min24 Dec
Singapore06:22 → 06:2318:050 min18:0596 min24 Dec
Sydney09:22 → 09:2319:060 min19:0677 min24 Dec
Suva11:22 → 11:2318:410 min18:4286 min24 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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