Friday 13 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 10:26 on Fri 13 Sep to 11:27 on Sat 14 Sep.

   1918-09-13T02:25:47Z → 1918-09-14T03:26:47Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:27–12:15 on the 13th, 11:27–12:15 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 0 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 6 s < 300 s

5. 05

   Ruling

   Rādhāṣṭamī, Jiading, 1918: Friday 13 September.

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

Say it like this

In Jiading, Rādhāṣṭamī 1918 falls on Friday 13 September. Aṣṭamī runs from 10:26 on Fri 13 Sep to 11:27 on Sat 14 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 0 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 0 min 06 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.