Sunday 3 September

How it was decided

1. 01

   Aṅga

   Dvādaśī runs from 12:08 on Sat 2 Sep to 13:43 on Sun 3 Sep.

   2017-09-02T04:08:09Z → 2017-09-03T05:42:55Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:54–12:42 on the 2nd, 11:53–12:41 on the 3rd.

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

3. 03

   Rule

   Dvādaśī must be present during madhyāhna. It covers 33 of 48 minutes on the 2nd and 48 of 48 on the 3rd.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

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 877 s

5. 05

   Ruling

   Vāmana Jayantī, Baoding, 2017: Sunday 3 September.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Vāmana Jayantī 2017 falls on Sunday 3 September. Dvādaśī runs from 12:08 on Sat 2 Sep to 13:43 on Sun 3 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 33 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.