Ruling · Dattātreyotpatti (Datta Jayanti) · 2057

Monday 10 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 489 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 Monday 10 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:52
16:3216:5617:2017:4418:0818:3218:5619:20

116 of 116 minutes covered

Evening of Tuesday 11 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:52
16:3216:5617:2017:4418:0818:3218:5619:20

0 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 06:27 on Mon 10 Dec to 08:47 on Tue 11 Dec.

    2057-12-09T22:27:00Z → 2057-12-11T00:46:39Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 10th, 16:56–18:52 on the 11th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 116 of 116 minutes on the 10th and 0 of 116 on the 11th.

    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 29360 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2057: Monday 10 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2057 falls on Monday 10 December. Pūrṇimā runs from 06:27 on Mon 10 Dec to 08:47 on Tue 11 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2057/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 10 Dec
Ahargaṇa, classicalDisc centre, no refractionMon 10 Dec
compat-drikpanchangComparison profileMon 10 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 9thCoveredSunset 11thCoveredRuled
Los Angeles14:27 → 16:4716:44113 min16:440 min9 Dec
Chicago16:27 → 18:4716:19111 min16:190 min10 Dec
Jersey City17:27 → 19:4716:2859 min16:290 min10 Dec
Port of Spain18:27 → 20:4717:4457 min17:450 min10 Dec
London22:27 → 00:4715:510 min15:510 min10 Dec
Durban00:27 → 02:4718:490 min18:500 min10 Dec
Dubai02:27 → 04:4717:300 min17:300 min10 Dec
Delhi03:57 → 06:1717:240 min17:250 min10 Dec
Kolkata03:57 → 06:1716:520 min16:530 min10 Dec
Singapore06:27 → 08:4718:580 min18:590 min10 Dec
Sydney09:27 → 11:4719:580 min19:590 min10 Dec
Suva10:27 → 12:4718:340 min18:350 min10 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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