Saturday 28 October

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 11:15 on Fri 27 Oct to 13:21 on Sat 28 Oct.

   2017-10-27T09:15:11Z → 2017-10-28T11:21:21Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 27th, 11:15–12:03 on the 28th.

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

3. 03

   Rule

   Aṣṭamī must be present during madhyāhna. It covers 47 of 48 minutes on the 27th and 48 of 48 on the 28th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

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 30 s < 300 s

5. 05

   Ruling

   Gopāṣṭamī, Cairo, 2017: Saturday 28 October.

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

Say it like this

In Cairo, Gopāṣṭamī 2017 falls on Saturday 28 October. Aṣṭamī runs from 11:15 on Fri 27 Oct to 13:21 on Sat 28 Oct and covers all of madhyāhna that midday. It also reaches the previous midday for 47 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 30 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.