Friday 28 January

How it was decided

1. 01

   Aṅga

   Caturthī runs from 18:27 on Thu 27 Jan to 18:41 on Fri 28 Jan.

   2039-01-27T10:26:49Z → 2039-01-28T10:41:22Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 17:33–19:24 on the 27th, 17:34–19:25 on the 28th.

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

3. 03

   Rule

   Caturthī must be present during pradoṣa. It covers 57 of 111 minutes on the 27th and 67 of 111 on the 28th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

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 2624 s

5. 05

   Ruling

   Tila Caturthī, Baoding, 2039: Friday 28 January.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Tila Caturthī 2039 falls on Friday 28 January. Caturthī runs from 18:27 on Thu 27 Jan to 18:41 on Fri 28 Jan and covers 67 of 111 minutes of pradoṣa that evening. It also reaches the previous evening for 57 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.