Wednesday 29 July

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 20:05 on Tue 28 Jul to 20:47 on Wed 29 Jul.

   1931-07-28T12:05:18Z → 1931-07-29T12:47:26Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 19:34–20:52 on the 28th, 19:33–20:51 on the 29th.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 46 of 78 minutes on the 28th and 74 of 78 on the 29th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

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 207 s < 300 s

5. 05

   Ruling

   Śiva Śayanotsava, Baoding, 1931: Wednesday 29 July.

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

Say it like this

In Baoding, Śiva Śayanotsava 1931 falls on Wednesday 29 July. Pūrṇimā runs from 20:05 on Tue 28 Jul to 20:47 on Wed 29 Jul and covers 74 of 78 minutes of pradoṣa that evening. It also reaches the previous evening for 46 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 27 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.