Thursday 2 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 10:22 on Thu 2 Sep to 11:43 on Fri 3 Sep.

   1965-09-02T06:51:52Z → 1965-09-03T08:13:14Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:40–12:28 on the 2nd, 11:39–12:27 on the 3rd.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 2nd and 4 of 48 on the 3rd.

   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 228 s < 300 s

5. 05

   Ruling

   Rādhāṣṭamī, Tehran, 1965: Thursday 2 September.

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

Say it like this

In Tehran, Rādhāṣṭamī 1965 falls on Thursday 2 September. Aṣṭamī runs from 10:22 on Thu 2 Sep to 11:43 on Fri 3 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 4 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 3 min 48 s from a threshold: 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.