Sunday 21 February

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 23:55 on Sun 21 Feb to 00:37 on Tue 23 Feb.

   1982-02-21T20:24:38Z → 1982-02-22T21:07:05Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:54–00:42 on the 21st, 23:54–00:42 on the 22nd.

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

3. 03

   Rule

   Caturdaśī must be present during niśītha. It covers 47 of 48 minutes on the 21st and 44 of 48 on the 22nd.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

4. 04

   Tie-break

   Both nights qualify and the cited authorities disagree. The one covered longer is ruled, as a boundary.

   priority: disputed → greater-coverage · margin 58 s < 300 s

5. 05

   Ruling

   Mahāśivarātri, Tehran, 1982: Sunday 21 February.

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

Say it like this

In Tehran, Mahāśivarātri 1982 falls on Sunday 21 February. Caturdaśī runs from 23:55 on Sun 21 Feb to 00:37 on Tue 23 Feb and covers 47 of 48 minutes of niśītha that night. It also reaches the next night for 44 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 0 min 58 s from a threshold: treat the date as contested.

Copy with citation

Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.