Thursday 20 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 12:00 on Wed 19 Sep to 13:27 on Thu 20 Sep.

   2007-09-19T03:59:39Z → 2007-09-20T05:27:02Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:57–12:45 on the 19th, 11:56–12:44 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 45 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 187 s < 300 s

5. 05

   Ruling

   Rādhāṣṭamī, Datong, 2007: Thursday 20 September.

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

Say it like this

In Datong, Rādhāṣṭamī 2007 falls on Thursday 20 September. Aṣṭamī runs from 12:00 on Wed 19 Sep to 13:27 on Thu 20 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 45 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 07 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.