Tuesday 18 December

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 18:46 on Mon 17 Dec to 20:16 on Tue 18 Dec.

   2040-12-17T10:46:10Z → 2040-12-18T12:15:48Z

2. 02

   Kāla

   Pradoṣa is 2 muhūrtas after sunset: 16:58–18:54 on the 17th, 16:58–18:55 on the 18th.

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

3. 03

   Rule

   Pūrṇimā must be present during pradoṣa. It covers 8 of 117 minutes on the 17th and 117 of 117 on the 18th.

   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 477 s

5. 05

   Ruling

   Dattātreyotpatti, Baoding, 2040: Tuesday 18 December.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2040 falls on Tuesday 18 December. Pūrṇimā runs from 18:46 on Mon 17 Dec to 20:16 on Tue 18 Dec and covers all of pradoṣa that evening. It also reaches the previous evening for 8 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

Copy with citation

Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.