Tuesday 21 August

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 20:16 on Mon 20 Aug to 22:38 on Tue 21 Aug.

   1979-08-20T12:16:15Z → 1979-08-21T14:37:41Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 19:07–20:31 on the 20th, 19:06–20:30 on the 21st.

   pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Caturdaśī must be present during pradoṣa. It covers 15 of 84 minutes on the 20th and 84 of 84 on the 21st.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

4. 04

   Tie-break

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

   priority: unstated → greater-coverage · margin 891 s

5. 05

   Ruling

   Aghora Caturdaśī, Baoding, 1979: Tuesday 21 August.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Aghora Caturdaśī 1979 falls on Tuesday 21 August. Caturdaśī runs from 20:16 on Mon 20 Aug to 22:38 on Tue 21 Aug and covers all of pradoṣa that evening. It also reaches the previous evening for 15 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

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Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.