Sunday 15 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 15:44 on Sat 14 Mar to 16:13 on Sun 15 Mar.

   1987-03-14T12:44:20Z → 1987-03-15T13:12:41Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 15:38–18:01 on the 14th, 15:38–18:02 on the 15th.

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

3. 03

   Rule

   Pūrṇimā must be present during sāyāhna. It covers 137 of 143 minutes on the 14th and 35 of 144 on the 15th.

   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 394 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Saturday 14 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Riyadh, 1987: Sunday 15 March.

   confidence: boundary (tie-break-unstated)

Say it like this

In Riyadh, Holī 1987 falls on Sunday 15 March. It is kept the day after Holikā Dahana, which falls on Saturday 14 March. Pūrṇimā runs from 15:44 on Sat 14 Mar to 16:13 on Sun 15 Mar and covers 137 of 143 minutes of sāyāhna on the 14th. It also reaches the next late afternoon for 35 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.