Friday 13 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 09:15 on Fri 13 Sep to 11:37 on Sat 14 Sep.

   2097-09-13T01:14:33Z → 2097-09-14T03:36:33Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:12–12:00 on the 13th, 11:11–11:59 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 48 of 48 minutes on the 13th and 25 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 1371 s

5. 05

   Ruling

   Rādhāṣṭamī, Daqing, 2097: Friday 13 September.

   confidence: boundary (tie-break-unstated)

Say it like this

In Daqing, Rādhāṣṭamī 2097 falls on Friday 13 September. Aṣṭamī runs from 09:15 on Fri 13 Sep to 11:37 on Sat 14 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 25 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.