Monday 20 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 11:42 on Sun 19 Sep to 14:09 on Mon 20 Sep.

   1920-09-19T15:42:06Z → 1920-09-20T18:09:03Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:30–12:18 on the 19th, 11:30–12:18 on the 20th.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 36 of 48 minutes on the 19th and 48 of 48 on the 20th.

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

4. 04

   Tie-break

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

   priority: unstated → greater-coverage · margin 733 s

5. 05

   Ruling

   Rādhāṣṭamī, Manaus, 1920: Monday 20 September.

   confidence: boundary (tie-break-unstated)

Say it like this

In Manaus, Rādhāṣṭamī 1920 falls on Monday 20 September. Aṣṭamī runs from 11:42 on Sun 19 Sep to 14:09 on Mon 20 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 36 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.