Sunday 13 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 16:54 on Sat 12 Mar to 16:26 on Sun 13 Mar.

   1960-03-12T08:53:56Z → 1960-03-13T08:25:48Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 16:09–18:30 on the 12th, 16:09–18:31 on the 13th.

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

3. 03

   Rule

   Pūrṇimā must be present during sāyāhna. It covers 96 of 141 minutes on the 12th and 17 of 142 on the 13th.

   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 992 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Saturday 12 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Datong, 1960: Sunday 13 March.

   confidence: boundary (tie-break-unstated)

Say it like this

In Datong, Holī 1960 falls on Sunday 13 March. It is kept the day after Holikā Dahana, which falls on Saturday 12 March. Pūrṇimā runs from 16:54 on Sat 12 Mar to 16:26 on Sun 13 Mar and covers 96 of 141 minutes of sāyāhna on the 12th. It also reaches the next late afternoon for 17 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.