Ruling · Dattātreyotpatti (Datta Jayanti) · 1939

Tuesday 26 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 30 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 25 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:01 sunsetpradoṣa ends 18:57
16:3717:0117:2517:4918:1318:3719:0119:25

0 of 117 minutes covered

Evening of Tuesday 26 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 21:24 on Mon 25 Dec to 19:28 on Tue 26 Dec.

    1939-12-25T13:24:02Z → 1939-12-26T11:28:25Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:01–18:57 on the 25th, 17:01–18:58 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 1829 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1939: Tuesday 26 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1939 falls on Tuesday 26 December. Pūrṇimā runs from 21:24 on Mon 25 Dec to 19:28 on Tue 26 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1939/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 25thCoveredSunset 26thCoveredRuled
Los Angeles05:24 → 03:2816:49113 min16:500 min25 Dec
Chicago07:24 → 05:2816:24119 min16:250 min25 Dec
Jersey City08:24 → 06:2816:34118 min16:340 min25 Dec
Port of Spain09:24 → 07:2817:51100 min17:510 min25 Dec
London13:24 → 11:2815:55129 min15:560 min25 Dec
Durban15:24 → 13:2818:5780 min18:580 min25 Dec
Dubai17:24 → 15:2817:36107 min17:360 min25 Dec
Delhi18:54 → 16:5817:3026 min17:310 min25 Dec
Kolkata18:54 → 16:5816:590 min16:590 min25 Dec
Singapore20:44 → 18:4818:260 min18:2622 min26 Dec
Sydney23:24 → 21:2819:070 min19:0777 min26 Dec
Suva01:24 → 23:2818:420 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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