Ruling · Dattātreyotpatti (Datta Jayanti) · 1966

Tuesday 27 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 404 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 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

Evening of Tuesday 27 December

Taken. The only evening Pūrṇimā reaches.

17:02 sunsetpradoṣa ends 18:59
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 02:40 on Tue 27 Dec to 01:43 on Wed 28 Dec.

    1966-12-26T18:40:29Z → 1966-12-27T17:43:06Z

  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 0 of 117 minutes on the 26th and 117 of 117 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 24262 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1966: Tuesday 27 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1966 falls on Tuesday 27 December. Pūrṇimā runs from 02:40 on Tue 27 Dec to 01:43 on Wed 28 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1966/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 27 Dec
Ahargaṇa, classicalDisc centre, no refractionTue 27 Dec
compat-drikpanchangComparison profileTue 27 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 Angeles10:40 → 09:4316:50113 min16:510 min26 Dec
Chicago12:40 → 11:4316:25119 min16:260 min26 Dec
Jersey City13:40 → 12:4316:34118 min16:350 min26 Dec
Port of Spain14:40 → 13:4317:52100 min17:520 min26 Dec
London18:40 → 17:4315:560 min15:57107 min27 Dec
Durban20:40 → 19:4318:580 min18:5845 min27 Dec
Dubai22:40 → 21:4317:360 min17:37107 min27 Dec
Delhi00:10 → 23:1317:310 min17:31110 min27 Dec
Kolkata00:10 → 23:1316:590 min17:00106 min27 Dec
Singapore02:10 → 01:1318:360 min18:3796 min27 Dec
Sydney04:40 → 03:4319:070 min19:0877 min27 Dec
Suva06:40 → 05:4318:430 min18:4386 min27 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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