Monday 14 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 11:37 on Sun 13 Sep to 14:12 on Mon 14 Sep.

   1964-09-13T08:06:57Z → 1964-09-14T10:41:40Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:36–12:24 on the 13th, 11:36–12:24 on the 14th.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 47 of 48 minutes on the 13th and 48 of 48 on the 14th.

   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 61 s < 300 s

5. 05

   Ruling

   Rādhāṣṭamī, Tehran, 1964: Monday 14 September.

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

Say it like this

In Tehran, Rādhāṣṭamī 1964 falls on Monday 14 September. Aṣṭamī runs from 11:37 on Sun 13 Sep to 14:12 on Mon 14 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 47 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 1 min 01 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.