Thursday 18 October

How it was decided

1. 01

   Aṅga

   Amāvasyā runs from 23:41 on Wed 17 Oct to 01:01 on Fri 19 Oct.

   2085-10-17T15:41:10Z → 2085-10-18T17:01:16Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:02–23:50 on the 17th, 23:02–23:50 on the 18th.

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

3. 03

   Rule

   Amāvasyā must be present during niśītha. It covers 9 of 48 minutes on the 17th and 48 of 48 on the 18th.

   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 523 s

5. 05

   Ruling

   Kālī Pūjā, Daqing, 2085: Thursday 18 October.

   confidence: boundary (tie-break-unstated)

Say it like this

In Daqing, Kālī Pūjā 2085 falls on Thursday 18 October. Amāvasyā runs from 23:41 on Wed 17 Oct to 01:01 on Fri 19 Oct and covers all of niśītha that night. It also reaches the previous night for 9 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.