Monday 13 September

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 19:03 on Sun 12 Sep to 20:58 on Mon 13 Sep.

   1909-09-12T11:03:21Z → 1909-09-13T12:58:21Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 18:33–20:04 on the 12th, 18:31–20:03 on the 13th.

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

3. 03

   Rule

   Caturdaśī must be present during pradoṣa. It covers 61 of 91 minutes on the 12th and 92 of 92 on the 13th.

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

4. 04

   Tie-break

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

   priority: unstated → greater-coverage · margin 1841 s

5. 05

   Ruling

   Aghora Caturdaśī, Baoding, 1909: Monday 13 September.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Aghora Caturdaśī 1909 falls on Monday 13 September. Caturdaśī runs from 19:03 on Sun 12 Sep to 20:58 on Mon 13 Sep and covers all of pradoṣa that evening. It also reaches the previous evening for 61 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.