Sunday 13 February

How it was decided

1. 01

   Aṅga

   Saptamī runs from 06:58 on Sat 12 Feb to 08:30 on Sun 13 Feb.

   2084-02-11T22:58:02Z → 2084-02-13T00:29:47Z

2. 02

   Kāla

   Aruṇodaya is 2 muhūrtas before sunrise: 05:27–07:14 on the 12th, 05:26–07:13 on the 13th.

   arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Saptamī must be present during aruṇodaya. It covers 16 of 107 minutes on the 12th and 107 of 107 on the 13th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

4. 04

   Tie-break

   Both dawns qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

   priority: unstated → greater-coverage · margin 953 s

5. 05

   Ruling

   Ratha Saptamī, Baoding, 2084: Sunday 13 February.

   confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Ratha Saptamī 2084 falls on Sunday 13 February. Saptamī runs from 06:58 on Sat 12 Feb to 08:30 on Sun 13 Feb and covers all of aruṇodaya that dawn. It also reaches the previous dawn for 16 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.