Saturday 20 January

How it was decided

1. 01

   Aṅga

   Caturthī runs from 16:41 on Sat 20 Jan to 18:04 on Sun 21 Jan.

   2018-01-20T08:41:08Z → 2018-01-21T10:03:40Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 17:25–19:18 on the 20th, 17:26–19:19 on the 21st.

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

3. 03

   Rule

   Caturthī must be present during pradoṣa. It covers 113 of 113 minutes on the 20th and 38 of 113 on the 21st.

   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 2253 s

5. 05

   Ruling

   Tila Caturthī, Baoding, 2018: Saturday 20 January.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Tila Caturthī 2018 falls on Saturday 20 January. Caturthī runs from 16:41 on Sat 20 Jan to 18:04 on Sun 21 Jan and covers all of pradoṣa that evening. It also reaches the next evening for 38 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.