Tuesday 26 October

How it was decided

1. 01

   Aṅga

   Amāvasyā runs from 23:25 on Mon 25 Oct to 01:47 on Wed 27 Oct.

   1954-10-25T15:25:13Z → 1954-10-26T17:46:56Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:01–23:49 on the 25th, 23:00–23:48 on the 26th.

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

3. 03

   Rule

   Amāvasyā must be present during niśītha. It covers 23 of 48 minutes on the 25th and 48 of 48 on the 26th.

   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 1403 s

5. 05

   Ruling

   Kālī Pūjā, Daqing, 1954: Tuesday 26 October.

   confidence: boundary (tie-break-unstated)

Say it like this

In Daqing, Kālī Pūjā 1954 falls on Tuesday 26 October. Amāvasyā runs from 23:25 on Mon 25 Oct to 01:47 on Wed 27 Oct and covers all of niśītha that night. It also reaches the previous night for 23 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.