Ruling · Dattātreyotpatti (Datta Jayanti) · 1934

Thursday 20 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 530 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 Wednesday 19 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:58 sunsetpradoṣa ends 18:55
16:3416:5817:2217:4618:1018:3418:5819:22

0 of 117 minutes covered

Evening of Thursday 20 December

Taken. The only evening Pūrṇimā reaches.

16:58 sunsetpradoṣa ends 18:55
16:3416:5817:2217:4618:1018:3418:5819:22

117 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 03:45 on Thu 20 Dec to 04:53 on Fri 21 Dec.

    1934-12-19T19:44:36Z → 1934-12-20T20:53:13Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:58–18:55 on the 19th, 16:58–18:55 on the 20th.

    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 19th and 117 of 117 on the 20th.

    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 31802 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1934: Thursday 20 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1934 falls on Thursday 20 December. Pūrṇimā runs from 03:45 on Thu 20 Dec to 04:53 on Fri 21 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1934/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 20 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 20 Dec
compat-drikpanchangComparison profileThu 20 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 19thCoveredSunset 20thCoveredRuled
Los Angeles11:45 → 12:5316:46113 min16:470 min19 Dec
Chicago13:45 → 14:5316:21119 min16:220 min19 Dec
Jersey City14:45 → 15:5316:31118 min16:310 min19 Dec
Port of Spain15:45 → 16:5317:48100 min17:480 min19 Dec
London19:45 → 20:5315:520 min15:52130 min20 Dec
Durban21:45 → 22:5318:550 min18:5580 min20 Dec
Dubai23:45 → 00:5317:330 min17:33107 min20 Dec
Delhi01:15 → 02:2317:270 min17:28110 min20 Dec
Kolkata01:15 → 02:2316:560 min16:56106 min20 Dec
Singapore03:05 → 04:1318:230 min18:2396 min20 Dec
Sydney05:45 → 06:5319:040 min19:0477 min20 Dec
Suva07:45 → 08:5318:390 min18:4086 min20 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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