Ruling · Mahānavamī · 2021

Thursday 14 October

Determinatein Puning, under the Rashtriya Panchang method. Clear of every threshold by 538 minutes.

Decide it for

23°19′ N 116°10′ E · Asia/Shanghai · GeoNames 1802940

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Wednesday 13 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

0 of 48 minutes covered

Midday of Thursday 14 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

48 of 48 minutes covered

Navamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Navamī runs from 22:38 on Wed 13 Oct to 21:23 on Thu 14 Oct.

    2021-10-13T14:38:14Z → 2021-10-14T13:22:51Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 13th, 11:37–12:25 on the 14th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

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

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 32260 s

  5. 05

    Ruling

    Mahānavamī, Puning, 2021: Thursday 14 October.

    confidence: determinate

Say it like this

In Puning, Mahānavamī 2021 falls on Thursday 14 October. Navamī runs from 22:38 on Wed 13 Oct to 21:23 on Thu 14 Oct and covers all of madhyāhna that midday.

ahargana.org/puning/festivals/2021/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 14 Oct
Ahargaṇa, classicalDisc centre, no refractionThu 14 Oct
compat-drikpanchangComparison profileThu 14 Oct
No institution has a recorded ruling for Puning.

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

The rule, as data

/rules/mahanavami · ruleset 2026.3-draft

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.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceNavamīMadhyāhna 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles07:38 → 06:2312:1548 min12:150 min13 Oct
Chicago09:38 → 08:2312:1248 min12:120 min13 Oct
Jersey City10:38 → 09:2312:1848 min12:180 min13 Oct
Port of Spain10:38 → 09:2311:2848 min11:280 min13 Oct
London15:38 → 14:2312:220 min12:2248 min14 Oct
Durban16:38 → 15:2311:180 min11:1848 min14 Oct
Dubai18:38 → 17:2311:410 min11:4148 min14 Oct
Delhi20:08 → 18:5311:430 min11:4348 min14 Oct
Kolkata20:08 → 18:5310:590 min10:5848 min14 Oct
Singapore22:38 → 21:2312:270 min12:2748 min14 Oct
Sydney01:38 → 00:2312:180 min12:1748 min14 Oct
Suva02:38 → 01:2311:290 min11:2848 min14 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahanavami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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