Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2007

Sunday 23 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 268 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 Sunday 23 December

Taken. The only evening Pūrṇimā reaches.

17:00 sunsetpradoṣa ends 18:56
16:3617:0017:2417:4818:1218:3619:0019:24

117 of 117 minutes covered

Evening of Monday 24 December

Pūrṇimā is absent from pradoṣa. Not taken.

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

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 12:32 on Sun 23 Dec to 09:16 on Mon 24 Dec.

    2007-12-23T04:32:00Z → 2007-12-24T01:15:36Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:00–18:56 on the 23rd, 17:00–18:57 on the 24th.

    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 23rd and 0 of 117 on the 24th.

    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 16070 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2007: Sunday 23 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2007 falls on Sunday 23 December. Pūrṇimā runs from 12:32 on Sun 23 Dec to 09:16 on Mon 24 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2007/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 23 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 23 Dec
compat-drikpanchangComparison profileSun 23 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 Angeles20:32 → 17:1616:4827 min16:490 min23 Dec
Chicago22:32 → 19:1616:23119 min16:240 min23 Dec
Jersey City23:32 → 20:1616:33118 min16:330 min23 Dec
Port of Spain00:32 → 21:1617:50100 min17:500 min23 Dec
London04:32 → 01:1615:54130 min15:540 min23 Dec
Durban06:32 → 03:1618:5780 min18:570 min23 Dec
Dubai08:32 → 05:1617:35107 min17:350 min23 Dec
Delhi10:02 → 06:4617:29110 min17:300 min23 Dec
Kolkata10:02 → 06:4616:58106 min16:580 min23 Dec
Singapore12:32 → 09:1619:0596 min19:050 min23 Dec
Sydney15:32 → 12:1620:0677 min20:060 min23 Dec
Suva16:32 → 13:1618:4186 min18:420 min23 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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