Ruling · Dattātreyotpatti (Datta Jayanti) · 1943

Saturday 11 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 314 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 Friday 10 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:56 sunsetpradoṣa ends 19:52
17:3217:5618:2018:4419:0819:3219:5620:20

0 of 116 minutes covered

Evening of Saturday 11 December

Taken. The only evening Pūrṇimā reaches.

17:56 sunsetpradoṣa ends 19:52
17:3217:5618:2018:4419:0819:3219:5620:20

116 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 01:05 on Sat 11 Dec to 01:24 on Sun 12 Dec.

    1943-12-10T16:05:30Z → 1943-12-11T16:24:25Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:56–19:52 on the 10th, 17:56–19:52 on the 11th.

    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 116 minutes on the 10th and 116 of 116 on the 11th.

    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 18820 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1943: Saturday 11 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1943 falls on Saturday 11 December. Pūrṇimā runs from 01:05 on Sat 11 Dec to 01:24 on Sun 12 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1943/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 11 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 11 Dec
compat-drikpanchangComparison profileSat 11 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 10thCoveredSunset 11thCoveredRuled
Los Angeles09:05 → 09:2417:44113 min17:440 min10 Dec
Chicago11:05 → 11:2417:19118 min17:190 min10 Dec
Jersey City12:05 → 12:2417:29118 min17:290 min10 Dec
Port of Spain13:05 → 13:2418:44100 min18:440 min10 Dec
London17:05 → 17:2416:51114 min16:5133 min10 Dec
Durban19:05 → 19:2419:4980 min19:490 min10 Dec
Dubai20:05 → 20:2417:300 min17:30107 min11 Dec
Delhi22:35 → 22:5418:240 min18:25109 min11 Dec
Kolkata22:35 → 22:5417:520 min17:53106 min11 Dec
Singapore01:05 → 01:2419:580 min19:5996 min11 Dec
Sydney03:05 → 03:2419:580 min19:5877 min11 Dec
Suva04:05 → 04:2418:340 min18:3587 min11 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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