Sunday 18 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 16:58 on Sat 17 Mar to 16:33 on Sun 18 Mar.

   1973-03-17T23:58:12Z → 1973-03-18T23:33:24Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 16:13–18:37 on the 17th, 16:14–18:38 on the 18th.

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

3. 03

   Rule

   Pūrṇimā must be present during sāyāhna. It covers 99 of 144 minutes on the 17th and 20 of 145 on the 18th.

   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 1189 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Saturday 17 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Phoenix, 1973: Sunday 18 March.

   confidence: boundary (tie-break-unstated)

Say it like this

In Phoenix, Holī 1973 falls on Sunday 18 March. It is kept the day after Holikā Dahana, which falls on Saturday 17 March. Pūrṇimā runs from 16:58 on Sat 17 Mar to 16:33 on Sun 18 Mar and covers 99 of 144 minutes of sāyāhna on the 17th. It also reaches the next late afternoon for 20 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.