Thursday 27 December

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 15:57 on Thu 27 Dec to 18:21 on Fri 28 Dec.

   2012-12-27T07:56:45Z → 2012-12-28T10:21:11Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 15:58–18:02 on the 27th, 15:59–18:03 on the 28th.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 123 of 123 minutes on the 27th and 123 of 123 on the 28th.

   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 99 s < 300 s

5. 05

   Ruling

   Dattātreyotpatti, Daqing, 2012: Thursday 27 December.

   confidence: boundary (margin, tie-break-unstated)

Say it like this

In Daqing, Dattātreyotpatti (Datta Jayanti) 2012 falls on Thursday 27 December. Pūrṇimā runs from 15:57 on Thu 27 Dec to 18:21 on Fri 28 Dec and covers all of pradoṣa that evening. It also reaches the next evening for 123 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 1 min 39 s from a threshold: treat the date as contested.

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Who says what

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