Janmāṣṭamī

1. १Step 1, Aṅga

   Aṣṭamī runs from 17:03 on Mon 7 Sep to 17:24 on Tue 8 Sep.

   2099-09-07T09:03:28Z → 2099-09-08T09:24:25Z
2. २Step 2, Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 23:50–00:38 on the 7th, 23:49–00:37 on the 8th.

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

   Aṣṭamī must be present during niśītha. It covers 48 of 48 minutes on the 7th and 0 of 48 on the 8th.

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

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

   priority: paraviddha → only-day · margin 23101 s
5. ५Step 5, Ruling

   Janmāṣṭamī, Puning, 2099: Monday 7 September.

   confidence: determinate

In Puning, Janmāṣṭamī 2099 falls on Monday 7 September. Aṣṭamī runs from 17:03 on Mon 7 Sep to 17:24 on Tue 8 Sep and covers all of niśītha that night.

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

Month

Śrāvaṇa, amānta

Pakṣa · aṅga

Kṛṣṇa · Aṣṭamī

Kāla

Niśītha

Priority

Paraviddhā

Tie-break

Second day

Reference

CRC 1955, p. 103

K 8 Janmastami (madhyaratra-vyapini), if midnight is covered on two days, or not on any day, it is to be observed on the 2nd day; special when combined with naksatra 'Rohini' at midnight, more so when on Monday or Wednesday. If the combination occurs before midnight and 'Rohini' extends up to midnight, it is to be observed on that day. Gokulastami. Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The clauses on Rohiṇī nakṣatra, the Vaiṣṇava observance on the day after saptamī, and the Assam and South India reckoning in the solar month belong to other readings and are not applied.