Thursday 27 February

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 17:10 on Wed 26 Feb to 16:09 on Thu 27 Feb.

   1964-02-26T13:39:34Z → 1964-02-27T12:39:12Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 15:40–17:55 on the 26th, 15:41–17:56 on the 27th.

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

3. 03

   Rule

   Pūrṇimā must be present during sāyāhna. It covers 46 of 135 minutes on the 26th and 28 of 136 on the 27th.

   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 1704 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Wednesday 26 February is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Tehran, 1964: Thursday 27 February.

   confidence: boundary (tie-break-unstated)

Say it like this

In Tehran, Holī 1964 falls on Thursday 27 February. It is kept the day after Holikā Dahana, which falls on Wednesday 26 February. Pūrṇimā runs from 17:10 on Wed 26 Feb to 16:09 on Thu 27 Feb and covers 46 of 135 minutes of sāyāhna on the 26th. It also reaches the next late afternoon for 28 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.