Saturday 28 October

How it was decided

1. 01

   Aṅga

   Amāvasyā runs from 20:55 on Sat 28 Oct to 23:27 on Sun 29 Oct.

   1989-10-28T12:55:28Z → 1989-10-29T15:27:04Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:00–23:48 on the 28th, 23:00–23:48 on the 29th.

   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 28th and 27 of 48 on the 29th.

   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 1267 s

5. 05

   Ruling

   Kālī Pūjā, Daqing, 1989: Saturday 28 October.

   confidence: boundary (tie-break-unstated)

Say it like this

In Daqing, Kālī Pūjā 1989 falls on Saturday 28 October. Amāvasyā runs from 20:55 on Sat 28 Oct to 23:27 on Sun 29 Oct and covers all of niśītha that night. It also reaches the next night for 27 minutes; the rule does not say which to take, and the one covered longer is ruled: 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.