Ruling · Dattātreyotpatti (Datta Jayanti) · 1928

Wednesday 26 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 536 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 25 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:01 sunsetpradoṣa ends 18:58
16:3717:0117:2517:4918:1318:3719:0119:25

0 of 117 minutes covered

Evening of Wednesday 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 07:36 on Wed 26 Dec to 03:55 on Thu 27 Dec.

    1928-12-25T23:35:37Z → 1928-12-26T19:54:38Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:01–18:58 on the 25th, 17:02–18:58 on the 26th.

    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 117 minutes on the 25th and 117 of 117 on the 26th.

    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 32177 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1928: Wednesday 26 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1928 falls on Wednesday 26 December. Pūrṇimā runs from 07:36 on Wed 26 Dec to 03:55 on Thu 27 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1928/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 26 Dec
Ahargaṇa, classicalDisc centre, no refractionWed 26 Dec
compat-drikpanchangComparison profileWed 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 25thCoveredSunset 26thCoveredRuled
Los Angeles15:36 → 11:5516:50113 min16:500 min25 Dec
Chicago17:36 → 13:5516:2548 min16:250 min25 Dec
Jersey City18:36 → 14:5516:340 min16:350 min25 Dec
Port of Spain19:36 → 15:5517:510 min17:520 min25 Dec
London23:36 → 19:5515:550 min15:56129 min26 Dec
Durban01:36 → 21:5518:580 min18:5880 min26 Dec
Dubai03:36 → 23:5517:360 min17:37107 min26 Dec
Delhi05:06 → 01:2517:300 min17:31110 min26 Dec
Kolkata05:06 → 01:2516:590 min17:00106 min26 Dec
Singapore06:36 → 02:5518:060 min18:0696 min26 Dec
Sydney09:36 → 05:5519:070 min19:0877 min26 Dec
Suva11:36 → 07:5518:430 min18:4386 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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