Saturday 25 February

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 00:09 on Sat 25 Feb to 23:51 on Sat 25 Feb.

   2017-02-24T16:08:42Z → 2017-02-25T15:50:49Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:29–00:17 on the 24th, 23:29–00:17 on the 25th.

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

3. 03

   Rule

   Caturdaśī must be present during niśītha. It covers 8 of 48 minutes on the 24th and 22 of 48 on the 25th.

   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 479 s

5. 05

   Ruling

   Mahāśivarātri, Daqing, 2017: Saturday 25 February.

   confidence: boundary (tie-break-disputed)

Say it like this

In Daqing, Mahāśivarātri 2017 falls on Saturday 25 February. Caturdaśī runs from 00:09 on Sat 25 Feb to 23:51 on Sat 25 Feb and covers 22 of 48 minutes of niśītha that night. It also reaches the previous night for 8 minutes; the rule does not say which to take, and the one covered longer is ruled: 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.