Friday 18 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 12:05 on Fri 18 Sep to 11:32 on Sat 19 Sep.

   1931-09-18T08:59:11Z → 1931-09-19T08:25:39Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:29–12:17 on the 18th, 11:29–12:17 on the 19th.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 12 of 48 minutes on the 18th and 3 of 48 on the 19th.

   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 156 s < 300 s

5. 05

   Ruling

   Rādhāṣṭamī, Riyadh, 1931: Friday 18 September.

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

Say it like this

In Riyadh, Rādhāṣṭamī 1931 falls on Friday 18 September. Aṣṭamī runs from 12:05 on Fri 18 Sep to 11:32 on Sat 19 Sep and covers 12 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 3 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 36 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.