Monday 21 October

How it was decided

1. 01

   Aṅga

   Amāvasyā runs from 21:31 on Mon 21 Oct to 23:04 on Tue 22 Oct.

   2052-10-21T13:30:50Z → 2052-10-22T15:03:34Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:01–23:49 on the 21st, 23:01–23:49 on the 22nd.

   nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Amāvasyā must be present during niśītha. It covers 48 of 48 minutes on the 21st and 3 of 48 on the 22nd.

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

4. 04

   Tie-break

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

   priority: unstated → greater-coverage · margin 163 s < 300 s

5. 05

   Ruling

   Kālī Pūjā, Daqing, 2052: Monday 21 October.

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

Say it like this

In Daqing, Kālī Pūjā 2052 falls on Monday 21 October. Amāvasyā runs from 21:31 on Mon 21 Oct to 23:04 on Tue 22 Oct and covers all of niśītha that night. It also reaches the next night for 3 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 43 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.