Saturday 8 December

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 18:07 on Fri 7 Dec to 18:53 on Sat 8 Dec.

   1984-12-07T10:06:36Z → 1984-12-08T10:53:21Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 7th, 16:56–18:52 on the 8th.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 45 of 116 minutes on the 7th and 116 of 116 on the 8th.

   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 106 s < 300 s

5. 05

   Ruling

   Dattātreyotpatti, Baoding, 1984: Saturday 8 December.

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

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1984 falls on Saturday 8 December. Pūrṇimā runs from 18:07 on Fri 7 Dec to 18:53 on Sat 8 Dec and covers all of pradoṣa that evening. It also reaches the previous evening for 45 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 46 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.