Saturday 27 October

How it was decided

1. 01

   Aṅga

   Navamī runs from 12:07 on Sat 27 Oct to 12:53 on Sun 28 Oct.

   1990-10-27T09:07:07Z → 1990-10-28T09:52:43Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:24–12:12 on the 27th, 11:24–12:12 on the 28th.

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

3. 03

   Rule

   Navamī must be present during madhyāhna. It covers 5 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. Pūrvaviddhā: the first is taken.

   priority: purvaviddha → purvaviddha · margin 272 s < 300 s

5. 05

   Ruling

   Durgā Navamī, Erbil, 1990: Saturday 27 October.

   confidence: boundary (margin)

Say it like this

In Erbil, Durgā Navamī 1990 falls on Saturday 27 October. Navamī runs from 12:07 on Sat 27 Oct to 12:53 on Sun 28 Oct and covers 5 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken. It is 4 min 32 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.