Friday 24 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 17:39 on Thu 23 Mar to 18:20 on Fri 24 Mar.

   1978-03-23T16:39:11Z → 1978-03-24T16:19:59Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 16:35–19:01 on the 23rd, 17:35–20:02 on the 24th.

   sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Pūrṇimā must be present during sāyāhna. It covers 82 of 147 minutes on the 23rd and 45 of 147 on the 24th.

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

4. 04

   Tie-break

   Both late afternoons qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

   priority: unstated → greater-coverage · margin 2693 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Thursday 23 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Algiers, 1978: Friday 24 March.

   confidence: boundary (tie-break-unstated)

Say it like this

In Algiers, Holī 1978 falls on Friday 24 March. It is kept the day after Holikā Dahana, which falls on Thursday 23 March. Pūrṇimā runs from 17:39 on Thu 23 Mar to 18:20 on Fri 24 Mar and covers 82 of 147 minutes of sāyāhna on the 23rd. It also reaches the next late afternoon for 45 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.