Friday 4 December

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 15:00 on Fri 4 Dec to 16:58 on Sat 5 Dec.

   2082-12-04T06:59:46Z → 2082-12-05T08:58:02Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 4th, 16:56–18:51 on the 5th.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 115 of 115 minutes on the 4th and 2 of 116 on the 5th.

   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 132 s < 300 s

5. 05

   Ruling

   Dattātreyotpatti, Baoding, 2082: Friday 4 December.

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

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2082 falls on Friday 4 December. Pūrṇimā runs from 15:00 on Fri 4 Dec to 16:58 on Sat 5 Dec and covers all of pradoṣa that evening. It also reaches the next evening for 2 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 2 min 12 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.