Tuesday 20 September

How it was decided

1. 01

   Aṅga

   Aṣṭamī runs from 20:05 on Mon 19 Sep to 21:01 on Tue 20 Sep.

   2011-09-20T01:04:56Z → 2011-09-21T02:00:44Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 19:32–21:06 on the 19th, 19:31–21:06 on the 20th.

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

3. 03

   Rule

   Aṣṭamī must be present during pradoṣa. It covers 61 of 95 minutes on the 19th and 90 of 95 on the 20th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

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 288 s < 300 s

5. 05

   Ruling

   Jitāṣṭamī, Puebla, 2011: Tuesday 20 September.

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

Say it like this

In Puebla, Jitāṣṭamī (Jitiya) 2011 falls on Tuesday 20 September. Aṣṭamī runs from 20:05 on Mon 19 Sep to 21:01 on Tue 20 Sep and covers 90 of 95 minutes of pradoṣa that evening. It also reaches the previous evening for 61 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 4 min 48 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.