Monday 16 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 11:54 on Sun 15 Sep to 14:14 on Mon 16 Sep.

   1991-09-15T08:54:10Z → 1991-09-16T11:14:09Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:24–12:12 on the 15th, 11:24–12:12 on the 16th.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 18 of 48 minutes on the 15th and 48 of 48 on the 16th.

   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 1091 s

5. 05

   Ruling

   Rādhāṣṭamī, Riyadh, 1991: Monday 16 September.

   confidence: boundary (tie-break-unstated)

Say it like this

In Riyadh, Rādhāṣṭamī 1991 falls on Monday 16 September. Aṣṭamī runs from 11:54 on Sun 15 Sep to 14:14 on Mon 16 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 18 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.