Friday 22 July

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 20:33 on Thu 21 Jul to 22:51 on Fri 22 Jul.

   2089-07-21T12:33:29Z → 2089-07-22T14:51:18Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 19:24–20:34 on the 21st, 19:23–20:33 on the 22nd.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 1 of 70 minutes on the 21st and 70 of 70 on the 22nd.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

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 40 s < 300 s

5. 05

   Ruling

   Śiva Śayanotsava, Daqing, 2089: Friday 22 July.

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

Say it like this

In Daqing, Śiva Śayanotsava 2089 falls on Friday 22 July. Pūrṇimā runs from 20:33 on Thu 21 Jul to 22:51 on Fri 22 Jul 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 40 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.