Friday 27 January

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 06:27 on Thu 26 Jan to 07:32 on Fri 27 Jan.

   2017-01-25T22:27:06Z → 2017-01-26T23:31:52Z

2. 02

   Kāla

   Aruṇodaya is 2 muhūrtas before sunrise: 05:38–07:30 on the 26th, 05:37–07:29 on the 27th.

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

3. 03

   Rule

   Caturdaśī must be present during aruṇodaya. It covers 63 of 112 minutes on the 26th and 112 of 112 on the 27th.

   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 178 s < 300 s

5. 05

   Ruling

   Yama Tarpaṇa, Baoding, 2017: Friday 27 January.

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

Say it like this

In Baoding, Yama Tarpaṇa 2017 falls on Friday 27 January. Caturdaśī runs from 06:27 on Thu 26 Jan to 07:32 on Fri 27 Jan and covers all of aruṇodaya that dawn. It also reaches the previous dawn for 63 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 2 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.