Saturday 9 May

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 11:26 on Fri 8 May to 12:01 on Sat 9 May.

   2009-05-08T03:25:46Z → 2009-05-09T04:01:25Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:13–12:01 on the 8th, 11:13–12:01 on the 9th.

   madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Pūrṇimā must be present during madhyāhna. It covers 35 of 48 minutes on the 8th and 48 of 48 on the 9th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

4. 04

   Tie-break

   Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

   priority: unstated → greater-coverage · margin 34 s < 300 s

5. 05

   Ruling

   Buddha Pūrṇimā, Daqing, 2009: Saturday 9 May.

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

Say it like this

In Daqing, Buddha Pūrṇimā 2009 falls on Saturday 9 May. Pūrṇimā runs from 11:26 on Fri 8 May to 12:01 on Sat 9 May and covers all of madhyāhna that midday. It also reaches the previous midday for 35 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 34 s from a threshold: treat the date as contested.

Copy with citation

Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.