Monday 9 September

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 18:38 on Mon 9 Sep to 15:09 on Tue 10 Sep.

   1912-09-09T10:38:04Z → 1912-09-10T07:09:23Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 18:37–20:07 on the 9th, 18:35–20:06 on the 10th.

   pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Caturdaśī must be present during pradoṣa. It covers 89 of 90 minutes on the 9th and 0 of 91 on the 10th.

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

4. 04

   Tie-break

   Only one evening qualifies. No tie-break is needed.

   priority: unstated → only-day · margin 65 s < 300 s

5. 05

   Ruling

   Aghora Caturdaśī, Baoding, 1912: Monday 9 September.

   confidence: boundary (margin)

Say it like this

In Baoding, Aghora Caturdaśī 1912 falls on Monday 9 September. Caturdaśī runs from 18:38 on Mon 9 Sep to 15:09 on Tue 10 Sep and covers 89 of 90 minutes of pradoṣa that evening. It is 1 min 05 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.