Saturday 20 January

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 05:00 on Sat 20 Jan to 07:33 on Sun 21 Jan.

   2080-01-19T21:00:30Z → 2080-01-20T23:32:46Z

2. 02

   Kāla

   Aruṇodaya is 2 muhūrtas before sunrise: 05:40–07:34 on the 20th, 05:40–07:33 on the 21st.

   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 20th and 113 of 113 on the 21st.

   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 16 s < 300 s

5. 05

   Ruling

   Yama Tarpaṇa, Baoding, 2080: Saturday 20 January.

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

Say it like this

In Baoding, Yama Tarpaṇa 2080 falls on Saturday 20 January. Caturdaśī runs from 05:00 on Sat 20 Jan to 07:33 on Sun 21 Jan and covers all of aruṇodaya that dawn. It also reaches the next dawn for 113 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 16 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.