Monday 12 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 11:28 on Sun 11 Sep to 12:46 on Mon 12 Sep.

   2089-09-11T05:27:36Z → 2089-09-12T06:46:29Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 11th, 11:25–12:13 on the 12th.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 46 of 48 minutes on the 11th and 48 of 48 on the 12th.

   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 136 s < 300 s

5. 05

   Ruling

   Rādhāṣṭamī, Chattogram, 2089: Monday 12 September.

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

Say it like this

In Chattogram, Rādhāṣṭamī 2089 falls on Monday 12 September. Aṣṭamī runs from 11:28 on Sun 11 Sep to 12:46 on Mon 12 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 46 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 2 min 16 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.