Ruling · Dattātreyotpatti (Datta Jayanti) · 2077

Wednesday 29 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 14 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 Tuesday 28 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:04 sunsetpradoṣa ends 19:00
16:4017:0417:2817:5218:1618:4019:0419:28

0 of 116 minutes covered

Evening of Wednesday 29 December

Taken. The only evening Pūrṇimā reaches.

17:04 sunsetpradoṣa ends 19:01
Pūrṇimā ends 18:46:29
16:4017:0417:2817:5218:1618:4019:0419:28

102 of 116 minutes covered, the first 102

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 20:18 on Tue 28 Dec to 18:46 on Wed 29 Dec.

    2077-12-28T12:18:21Z → 2077-12-29T10:46:30Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:04–19:00 on the 28th, 17:04–19:01 on the 29th.

    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 28th and 102 of 116 on the 29th.

    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 853 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2077: Wednesday 29 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2077 falls on Wednesday 29 December. Pūrṇimā runs from 20:18 on Tue 28 Dec to 18:46 on Wed 29 Dec and covers 102 of 116 minutes of pradoṣa that evening.

ahargana.org/baoding/festivals/2077/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 29 Dec
Ahargaṇa, classicalDisc centre, no refractionWed 29 Dec
compat-drikpanchangComparison profileWed 29 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 28thCoveredSunset 29thCoveredRuled
Los Angeles04:18 → 02:4616:52113 min16:530 min28 Dec
Chicago06:18 → 04:4616:27119 min16:280 min28 Dec
Jersey City07:18 → 05:4616:37118 min16:370 min28 Dec
Port of Spain08:18 → 06:4617:53100 min17:540 min28 Dec
London12:18 → 10:4615:58129 min15:590 min28 Dec
Durban14:18 → 12:4618:5980 min18:590 min28 Dec
Dubai16:18 → 14:4617:38107 min17:390 min28 Dec
Delhi17:48 → 16:1617:3394 min17:330 min28 Dec
Kolkata17:48 → 16:1617:0159 min17:020 min28 Dec
Singapore20:18 → 18:4619:0825 min19:080 min28 Dec
Sydney23:18 → 21:4620:080 min20:0977 min29 Dec
Suva00:18 → 22:4618:440 min18:4486 min29 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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