Monday 19 February

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 00:36 on Mon 19 Feb to 02:35 on Tue 20 Feb.

   2080-02-18T16:35:46Z → 2080-02-19T18:34:48Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 00:08–00:56 on the 18th, 00:08–00:56 on the 19th.

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

3. 03

   Rule

   Caturdaśī must be present during niśītha. It covers 20 of 48 minutes on the 18th and 48 of 48 on the 19th.

   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 1204 s

5. 05

   Ruling

   Mahāśivarātri, Baoding, 2080: Monday 19 February.

   confidence: boundary (tie-break-disputed)

Say it like this

In Baoding, Mahāśivarātri (Shivratri) 2080 falls on Monday 19 February. Caturdaśī runs from 00:36 on Mon 19 Feb to 02:35 on Tue 20 Feb and covers all of niśītha that night. It also reaches the previous night for 20 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.