Ruling · Dattātreyotpatti (Datta Jayanti) · 2023

Tuesday 26 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 509 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 26 December

Taken. The only evening Pūrṇimā reaches.

17:02 sunsetpradoṣa ends 18:58
16:3817:0217:2617:5018:1418:3819:0219:26

117 of 117 minutes covered

Evening of Wednesday 27 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:02 sunsetpradoṣa ends 18:59
16:3817:0217:2617:5018:1418:3819:0219:26

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 08:17 on Tue 26 Dec to 08:33 on Wed 27 Dec.

    2023-12-26T00:17:15Z → 2023-12-27T00:33:13Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:02–18:58 on the 26th, 17:02–18:59 on the 27th.

    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 26th and 0 of 116 on the 27th.

    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 30542 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2023: Tuesday 26 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2023 falls on Tuesday 26 December. Pūrṇimā runs from 08:17 on Tue 26 Dec to 08:33 on Wed 27 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2023/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 26 Dec
Ahargaṇa, classicalDisc centre, no refractionTue 26 Dec
compat-drikpanchangComparison profileTue 26 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 26thCoveredSunset 27thCoveredRuled
Los Angeles16:17 → 16:3316:500 min16:510 min25 Dec
Chicago18:17 → 18:3316:25119 min16:260 min26 Dec
Jersey City19:17 → 19:3316:34118 min16:350 min26 Dec
Port of Spain20:17 → 20:3317:52100 min17:520 min26 Dec
London00:17 → 00:3315:56129 min15:570 min26 Dec
Durban02:17 → 02:3318:5880 min18:580 min26 Dec
Dubai04:17 → 04:3317:36107 min17:370 min26 Dec
Delhi05:47 → 06:0317:31110 min17:310 min26 Dec
Kolkata05:47 → 06:0316:59106 min17:000 min26 Dec
Singapore08:17 → 08:3319:0696 min19:070 min26 Dec
Sydney11:17 → 11:3320:0777 min20:080 min26 Dec
Suva12:17 → 12:3318:4386 min18:430 min26 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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