Sunday 6 February

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 03:49 on Sun 6 Feb to 06:18 on Mon 7 Feb.

   1921-02-05T19:49:21Z → 1921-02-06T22:18:19Z

2. 02

   Kāla

   Aruṇodaya is 2 muhūrtas before sunrise: 05:06–06:59 on the 6th, 05:05–06:58 on the 7th.

   arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Caturdaśī must be present during aruṇodaya. It covers 113 of 113 minutes on the 6th and 74 of 113 on the 7th.

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

4. 04

   Tie-break

   Both dawns qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

   priority: unstated → greater-coverage · margin 2365 s

5. 05

   Ruling

   Yama Tarpaṇa, Daqing, 1921: Sunday 6 February.

   confidence: boundary (tie-break-unstated)

Say it like this

In Daqing, Yama Tarpaṇa 1921 falls on Sunday 6 February. Caturdaśī runs from 03:49 on Sun 6 Feb to 06:18 on Mon 7 Feb and covers all of aruṇodaya that dawn. It also reaches the next dawn for 74 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.