Thursday 26 October

How it was decided

1. 01

   Aṅga

   Trayodaśī runs from 15:53 on Thu 26 Oct to 18:22 on Fri 27 Oct.

   1989-10-26T07:53:00Z → 1989-10-27T10:22:13Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 17:25–19:11 on the 26th, 17:24–19:10 on the 27th.

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

3. 03

   Rule

   Trayodaśī must be present during pradoṣa. It covers 106 of 106 minutes on the 26th and 58 of 106 on the 27th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

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 2876 s

5. 05

   Ruling

   Yama Dīpadāna, Baoding, 1989: Thursday 26 October.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Yama Dīpadāna 1989 falls on Thursday 26 October. Trayodaśī runs from 15:53 on Thu 26 Oct to 18:22 on Fri 27 Oct and covers all of pradoṣa that evening. It also reaches the next evening for 58 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.