Wednesday 27 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 18:55 on Tue 26 Mar to 17:27 on Wed 27 Mar.

   2013-03-26T10:54:53Z → 2013-03-27T09:27:18Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 17:01–19:30 on the 26th, 17:02–19:30 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 35 of 148 minutes on the 26th and 26 of 149 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 1537 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Tuesday 26 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Xining, 2013: Wednesday 27 March.

   confidence: boundary (tie-break-unstated)

Say it like this

In Xining, Holī 2013 falls on Wednesday 27 March. It is kept the day after Holikā Dahana, which falls on Tuesday 26 March. Pūrṇimā runs from 18:55 on Tue 26 Mar to 17:27 on Wed 27 Mar and covers 35 of 148 minutes of sāyāhna on the 26th. It also reaches the next late afternoon for 26 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.