Sunday 25 December

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 18:17 on Sat 24 Dec to 20:49 on Sun 25 Dec.

   1977-12-24T10:17:10Z → 1977-12-25T12:49:02Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 17:01–18:57 on the 24th, 17:01–18:58 on the 25th.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 40 of 117 minutes on the 24th and 117 of 117 on the 25th.

   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 2403 s

5. 05

   Ruling

   Dattātreyotpatti, Baoding, 1977: Sunday 25 December.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1977 falls on Sunday 25 December. Pūrṇimā runs from 18:17 on Sat 24 Dec to 20:49 on Sun 25 Dec and covers all of pradoṣa that evening. It also reaches the previous evening for 40 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

Copy with citation

Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.