Ruling · Dattātreyotpatti (Datta Jayanti) · 1907

Thursday 19 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 303 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 18 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:57 sunsetpradoṣa ends 18:54
16:3316:5717:2117:4518:0918:3318:5719:21

0 of 117 minutes covered

Evening of Thursday 19 December

Taken. The only evening Pūrṇimā reaches.

16:58 sunsetpradoṣa ends 18:54
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 23:57 on Wed 18 Dec to 01:55 on Fri 20 Dec.

    1907-12-18T15:57:25Z → 1907-12-19T17:54:55Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:54 on the 18th, 16:58–18:54 on the 19th.

    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 18th and 117 of 117 on the 19th.

    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 18204 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1907: Thursday 19 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1907 falls on Thursday 19 December. Pūrṇimā runs from 23:57 on Wed 18 Dec to 01:55 on Fri 20 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1907/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 19 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 19 Dec
compat-drikpanchangComparison profileThu 19 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 18thCoveredSunset 19thCoveredRuled
Los Angeles07:57 → 09:5516:46113 min16:460 min18 Dec
Chicago09:57 → 11:5516:21119 min16:210 min18 Dec
Jersey City10:57 → 12:5516:30118 min16:310 min18 Dec
Port of Spain11:57 → 13:5517:47100 min17:480 min18 Dec
London15:57 → 17:5515:52124 min15:52123 min18 Dec
Durban17:57 → 19:5518:5480 min18:5461 min18 Dec
Dubai19:38 → 21:3617:130 min17:14107 min19 Dec
Delhi21:27 → 23:2517:270 min17:27110 min19 Dec
Kolkata21:27 → 23:2516:550 min16:56106 min19 Dec
Singapore22:57 → 00:5518:020 min18:0396 min19 Dec
Sydney01:57 → 03:5519:030 min19:0477 min19 Dec
Suva03:52 → 05:5018:340 min18:3486 min19 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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