Ruling · Dattātreyotpatti (Datta Jayanti) · 1958

Thursday 25 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 308 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 Thursday 25 December

Taken. The only evening Pūrṇimā reaches.

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

117 of 117 minutes covered

Evening of Friday 26 December

Pūrṇimā is absent from pradoṣa. Not taken.

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

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 10:56 on Thu 25 Dec to 11:54 on Fri 26 Dec.

    1958-12-25T02:55:37Z → 1958-12-26T03:54:04Z

  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 117 of 117 minutes on the 25th and 0 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 18453 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1958: Thursday 25 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1958 falls on Thursday 25 December. Pūrṇimā runs from 10:56 on Thu 25 Dec to 11:54 on Fri 26 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1958/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 25 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 25 Dec
compat-drikpanchangComparison profileThu 25 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 Angeles18:56 → 19:5416:49113 min16:500 min25 Dec
Chicago20:56 → 21:5416:25119 min16:250 min25 Dec
Jersey City21:56 → 22:5416:34118 min16:340 min25 Dec
Port of Spain22:56 → 23:5417:51100 min17:520 min25 Dec
London02:56 → 03:5415:55129 min15:560 min25 Dec
Durban04:56 → 05:5418:5880 min18:580 min25 Dec
Dubai06:56 → 07:5417:36107 min17:360 min25 Dec
Delhi08:26 → 09:2417:30110 min17:310 min25 Dec
Kolkata08:26 → 09:2416:59106 min16:590 min25 Dec
Singapore10:26 → 11:2418:3696 min18:360 min25 Dec
Sydney12:56 → 13:5419:0777 min19:070 min25 Dec
Suva14:56 → 15:5418:4286 min18:430 min25 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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