Ruling · Dattātreyotpatti (Datta Jayanti) · 2046

Wednesday 12 December

Boundaryin Baoding, under the Rashtriya Panchang method. Both evenings qualify and the rule does not say which to take. Say “contested”.

Decide it for

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 12 December

Taken. Both evenings qualify; the rule is silent, and this one is covered longer.

16:56 sunsetpradoṣa ends 18:52
Pūrṇimā begins 17:17:42
16:3216:5617:2017:4418:0818:3218:5619:20

95 of 116 minutes covered, the last 95

Evening of Thursday 13 December

Qualifies with 59 of 116 minutes. Not taken.

16:56 sunsetpradoṣa ends 18:53
Pūrṇimā ends 17:55:32
16:3216:5617:2017:4418:0818:3218:5619:20

59 of 116 minutes covered, the first 59

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 17:18 on Wed 12 Dec to 17:56 on Thu 13 Dec.

    2046-12-12T09:17:43Z → 2046-12-13T09:55:33Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 12th, 16:56–18:53 on the 13th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 95 of 116 minutes on the 12th and 59 of 116 on the 13th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Both evenings qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 1299 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2046: Wednesday 12 December.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2046 falls on Wednesday 12 December. Pūrṇimā runs from 17:18 on Wed 12 Dec to 17:56 on Thu 13 Dec and covers 95 of 116 minutes of pradoṣa that evening. It also reaches the next evening for 59 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/baoding/festivals/2046/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 12 Dec
Ahargaṇa, classicalDisc centre, no refractionWed 12 Dec
compat-drikpanchangComparison profileWed 12 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 12thCoveredSunset 13thCoveredRuled
Los Angeles01:18 → 01:5616:44113 min16:440 min12 Dec
Chicago03:18 → 03:5616:19119 min16:200 min12 Dec
Jersey City04:18 → 04:5616:29118 min16:290 min12 Dec
Port of Spain05:18 → 05:5617:45100 min17:450 min12 Dec
London09:18 → 09:5615:51129 min15:510 min12 Dec
Durban11:18 → 11:5618:5180 min18:510 min12 Dec
Dubai13:18 → 13:5617:30107 min17:310 min12 Dec
Delhi14:48 → 15:2617:25109 min17:250 min12 Dec
Kolkata14:48 → 15:2616:53106 min16:540 min12 Dec
Singapore17:18 → 17:5619:0096 min19:000 min12 Dec
Sydney20:18 → 20:5620:0059 min20:0055 min12 Dec
Suva21:18 → 21:5618:360 min18:3686 min13 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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