Rādhāṣṭamī

1. १Step 1, Aṅga

   Aṣṭamī runs from 12:41 on Mon 13 Sep to 10:40 on Tue 14 Sep.

   2021-09-13T09:41:14Z → 2021-09-14T07:39:45Z
2. २Step 2, Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:06–11:54 on the 13th, 11:05–11:53 on the 14th.

   madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′
3. ३Step 3, Rule

   Aṣṭamī must be present during madhyāhna. It covers 0 of 48 minutes on the 13th and 0 of 48 on the 14th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103
4. ४Step 4, Tie-break

   Neither midday qualifies. The source says what then (p. 101): the second day.

   no day qualifies → second-day, stated: Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 101 · margin 1528 s
5. ५Step 5, Ruling

   Rādhāṣṭamī, Doha, 2021: Tuesday 14 September.

   confidence: determinate

In Doha, Rādhāṣṭamī 2021 falls on Tuesday 14 September. Aṣṭamī runs from 12:41 on Mon 13 Sep to 10:40 on Tue 14 Sep, and reaches madhyāhna on neither day. For that case the source takes the second day (Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 101).

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

Month

Bhādrapada, amānta

Pakṣa · aṅga

Śukla · Aṣṭamī

Kāla

Madhyāhna

Priority

Unstated

Tie-break

Longer coverage, as a boundary

Reference

CRC 1955, p. 103

S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini) Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

Here noon or madhyahna relates to the period of time from 24 minutes (one ghatika) before mid-day upto the same time after it. This is the most appropriate time. If this time is not covered by the tithi on any day, the festival is to be observed on the succeeding day of the tithi. Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 101.