Ruling · Dattātreyotpatti (Datta Jayanti) · 1955

Wednesday 28 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 93 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 Wednesday 28 December

Taken. The only evening Pūrṇimā reaches.

17:03 sunsetpradoṣa ends 18:59
16:3917:0317:2717:5118:1518:3919:0319:27

116 of 116 minutes covered

Evening of Thursday 29 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:03 sunsetpradoṣa ends 19:00
16:3917:0317:2717:5118:1518:3919:0319:27

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 15:30 on Wed 28 Dec to 11:44 on Thu 29 Dec.

    1955-12-28T07:30:03Z → 1955-12-29T03:43:55Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:03–18:59 on the 28th, 17:03–19:00 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 116 of 116 minutes on the 28th and 0 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 5561 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1955: Wednesday 28 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1955 falls on Wednesday 28 December. Pūrṇimā runs from 15:30 on Wed 28 Dec to 11:44 on Thu 29 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1955/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 28 Dec
Ahargaṇa, classicalDisc centre, no refractionWed 28 Dec
compat-drikpanchangComparison profileWed 28 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 Angeles23:30 → 19:4416:51113 min16:520 min28 Dec
Chicago01:30 → 21:4416:26119 min16:270 min28 Dec
Jersey City02:30 → 22:4416:36118 min16:360 min28 Dec
Port of Spain03:30 → 23:4417:52100 min17:530 min28 Dec
London07:30 → 03:4415:57129 min15:580 min28 Dec
Durban09:30 → 05:4418:5980 min18:590 min28 Dec
Dubai11:30 → 07:4417:37107 min17:380 min28 Dec
Delhi13:00 → 09:1417:32109 min17:330 min28 Dec
Kolkata13:00 → 09:1417:00106 min17:010 min28 Dec
Singapore15:00 → 11:1418:3796 min18:380 min28 Dec
Sydney17:30 → 13:4419:0877 min19:080 min28 Dec
Suva19:30 → 15:4418:4440 min18:440 min28 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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