Mahānavamī

1. १Step 1, Aṅga

   Navamī runs from 04:32 on Mon 16 Oct to 05:09 on Tue 17 Oct.

   1972-10-16T01:31:41Z → 1972-10-17T02:09:14Z
2. २Step 2, Kāla

   Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 16th, 11:14–12:02 on the 17th.

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

   Navamī must be present during madhyāhna. It covers 48 of 48 minutes on the 16th and 0 of 48 on the 17th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104
4. ४Step 4, Tie-break

   Only one midday qualifies. No tie-break is needed.

   priority: purvaviddha → only-day · margin 21904 s
5. ५Step 5, Ruling

   Mahānavamī, Riyadh, 1972: Monday 16 October.

   confidence: determinate

In Riyadh, Mahānavamī 1972 falls on Monday 16 October. Navamī runs from 04:32 on Mon 16 Oct to 05:09 on Tue 17 Oct and covers all of madhyāhna that midday.

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

Month

Āśvina, amānta

Pakṣa · aṅga

Śukla · Navamī

Kāla

Madhyāhna

Priority

Pūrvaviddhā

Tie-break

First day

Reference

CRC 1955, p. 104

S 9 Mahanavami (purvaviddha) (In Bengal it is observed as paraviddha covering one muhurta from sunrise). Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.