Wednesday 4 February

How it was decided

1. 01

   Aṅga

   Caturthī runs from 19:30 on Tue 3 Feb to 20:09 on Wed 4 Feb.

   2071-02-03T11:30:04Z → 2071-02-04T12:09:09Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 17:41–19:31 on the 3rd, 17:42–19:32 on the 4th.

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

3. 03

   Rule

   Caturthī must be present during pradoṣa. It covers 1 of 109 minutes on the 3rd and 109 of 109 on the 4th.

   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 39 s < 300 s

5. 05

   Ruling

   Tila Caturthī, Baoding, 2071: Wednesday 4 February.

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

Say it like this

In Baoding, Tila Caturthī 2071 falls on Wednesday 4 February. Caturthī runs from 19:30 on Tue 3 Feb to 20:09 on Wed 4 Feb and covers all of pradoṣa that evening. It also reaches the previous evening for 1 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 0 min 39 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.