Monday 26 October

How it was decided

1. 01

   Aṅga

   Amāvasyā runs from 21:50 on Mon 26 Oct to 23:43 on Tue 27 Oct.

   1981-10-26T18:20:22Z → 1981-10-27T20:13:16Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:25–00:13 on the 26th, 23:24–00:12 on the 27th.

   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 26th and 19 of 48 on the 27th.

   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 1129 s

5. 05

   Ruling

   Kālī Pūjā, Tehran, 1981: Monday 26 October.

   confidence: boundary (tie-break-unstated)

Say it like this

In Tehran, Kālī Pūjā 1981 falls on Monday 26 October. Amāvasyā runs from 21:50 on Mon 26 Oct to 23:43 on Tue 27 Oct and covers all of niśītha that night. It also reaches the next night for 19 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.