Friday 13 September

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 17:41 on Fri 13 Sep to 18:25 on Sat 14 Sep.

   2069-09-13T09:41:29Z → 2069-09-14T10:24:49Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 18:29–20:01 on the 13th, 18:28–20:00 on the 14th.

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

3. 03

   Rule

   Caturdaśī must be present during pradoṣa. It covers 92 of 92 minutes on the 13th and 0 of 92 on the 14th.

   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 173 s < 300 s

5. 05

   Ruling

   Aghora Caturdaśī, Baoding, 2069: Friday 13 September.

   confidence: boundary (margin)

Say it like this

In Baoding, Aghora Caturdaśī 2069 falls on Friday 13 September. Caturdaśī runs from 17:41 on Fri 13 Sep to 18:25 on Sat 14 Sep and covers all of pradoṣa that evening. It is 2 min 53 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.