Tuesday 12 March

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 00:37 on Tue 12 Mar to 03:03 on Wed 13 Mar.

   2002-03-11T21:07:14Z → 2002-03-12T23:33:02Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:50–00:38 on the 11th, 23:50–00:38 on the 12th.

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

3. 03

   Rule

   Caturdaśī must be present during niśītha. It covers 1 of 48 minutes on the 11th and 48 of 48 on the 12th.

   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 45 s < 300 s

5. 05

   Ruling

   Mahāśivarātri, Tehran, 2002: Tuesday 12 March.

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

Say it like this

In Tehran, Mahāśivarātri 2002 falls on Tuesday 12 March. Caturdaśī runs from 00:37 on Tue 12 Mar to 03:03 on Wed 13 Mar and covers all of niśītha that night. It also reaches the previous night for 1 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 45 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.