Friday 27 January

How it was decided

1. 01

   Aṅga

   Pañcamī runs from 11:47 on Fri 27 Jan to 13:31 on Sat 28 Jan.

   2012-01-27T08:17:24Z → 2012-01-28T10:00:34Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:53–12:41 on the 27th, 11:53–12:41 on the 28th.

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

3. 03

   Rule

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

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

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 342 s

5. 05

   Ruling

   Vasanta Pañcamī, Tehran, 2012: Friday 27 January.

   confidence: boundary (tie-break-unstated)

Say it like this

In Tehran, Vasanta Pañcamī 2012 falls on Friday 27 January. Pañcamī runs from 11:47 on Fri 27 Jan to 13:31 on Sat 28 Jan and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: 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.