Tuesday 12 September

How it was decided

1. 01

   Aṅga

   Dvādaśī runs from 11:02 on Tue 12 Sep to 11:54 on Wed 13 Sep.

   2073-09-12T03:01:33Z → 2073-09-13T03:53:33Z

2. 02

   Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:50–12:38 on the 12th, 11:50–12:38 on the 13th.

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

3. 03

   Rule

   Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 12th and 4 of 48 on the 13th.

   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 221 s < 300 s

5. 05

   Ruling

   Vāmana Jayantī, Baoding, 2073: Tuesday 12 September.

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

Say it like this

In Baoding, Vāmana Jayantī 2073 falls on Tuesday 12 September. Dvādaśī runs from 11:02 on Tue 12 Sep to 11:54 on Wed 13 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 4 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 3 min 41 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.