Monday 19 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 17:58 on Sat 17 Mar to 17:33 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: 15:35–17:59 on the 17th, 15:36–18:00 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 1 of 144 minutes on the 17th and 118 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 58 s < 300 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Sunday 18 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Chicago, 1973: Monday 19 March.

   confidence: boundary (margin, tie-break-unstated)

Say it like this

In Chicago, Holī 1973 falls on Monday 19 March. It is kept the day after Holikā Dahana, which falls on Sunday 18 March. Pūrṇimā runs from 17:58 on Sat 17 Mar to 17:33 on Sun 18 Mar and covers 118 of 145 minutes of sāyāhna on the 18th. It also reaches the previous late afternoon for 1 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 0 min 58 s from a threshold: 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.