Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2005

Thursday 15 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 298 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 14 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:57 sunsetpradoṣa ends 18:53
16:3316:5717:2117:4518:0918:3318:5719:21

0 of 116 minutes covered

Evening of Thursday 15 December

Taken. The only evening Pūrṇimā reaches.

16:57 sunsetpradoṣa ends 18:53
16:3316:5717:2117:4518:0918:3318:5719:21

116 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 23:51 on Wed 14 Dec to 00:16 on Fri 16 Dec.

    2005-12-14T15:51:21Z → 2005-12-15T16:15:33Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:53 on the 14th, 16:57–18:53 on the 15th.

    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 14th and 116 of 116 on the 15th.

    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 17906 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2005: Thursday 15 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2005 falls on Thursday 15 December. Pūrṇimā runs from 23:51 on Wed 14 Dec to 00:16 on Fri 16 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2005/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 15 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 15 Dec
compat-drikpanchangComparison profileThu 15 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 14thCoveredSunset 15thCoveredRuled
Los Angeles07:51 → 08:1616:45113 min16:450 min14 Dec
Chicago09:51 → 10:1616:20119 min16:200 min14 Dec
Jersey City10:51 → 11:1616:29118 min16:290 min14 Dec
Port of Spain11:51 → 12:1617:46100 min17:460 min14 Dec
London15:51 → 16:1615:51129 min15:5124 min14 Dec
Durban17:51 → 18:1618:5280 min18:530 min14 Dec
Dubai19:51 → 20:1617:310 min17:31107 min15 Dec
Delhi21:21 → 21:4617:260 min17:26109 min15 Dec
Kolkata21:21 → 21:4616:540 min16:54106 min15 Dec
Singapore23:51 → 00:1619:010 min19:0196 min15 Dec
Sydney02:51 → 03:1620:010 min20:0277 min15 Dec
Suva03:51 → 04:1618:370 min18:3786 min15 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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