Ruling · Mahānavamī · 2009

Sunday 27 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 390 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

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

Midday of Sunday 27 September

Taken. The only midday Navamī reaches.

madhyāhna begins 11:07  11:55 madhyāhna ends
10:1910:4311:0711:3111:5512:1912:43

48 of 48 minutes covered

Midday of Monday 28 September

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:06  11:54 madhyāhna ends
10:1810:4211:0611:3011:5412:1812:42

0 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 02:01 on Sun 27 Sep to 04:36 on Mon 28 Sep.

    2009-09-26T18:01:29Z → 2009-09-27T20:36:19Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:07–11:55 on the 27th, 11:06–11:54 on the 28th.

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

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 48 of 48 minutes on the 27th and 0 of 48 on the 28th.

    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 23400 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 2009: Sunday 27 September.

    confidence: determinate

Say it like this

In Daqing, Mahānavamī 2009 falls on Sunday 27 September. Navamī runs from 02:01 on Sun 27 Sep to 04:36 on Mon 28 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2009/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 27 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 27 Sep
compat-drikpanchangComparison profileSun 27 Sep
No institution has a recorded ruling for Daqing.

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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles11:01 → 13:3612:2048 min12:2048 min26 Sep
Chicago13:01 → 15:3612:174 min12:1748 min26 Sep
Jersey City14:01 → 16:3612:230 min12:2348 min27 Sep
Port of Spain14:01 → 16:3611:330 min11:3348 min27 Sep
London19:01 → 21:3612:270 min12:2748 min27 Sep
Durban20:01 → 22:3611:230 min11:2348 min27 Sep
Dubai22:01 → 00:3611:460 min11:4648 min27 Sep
Delhi23:31 → 02:0611:480 min11:4848 min27 Sep
Kolkata23:31 → 02:0611:040 min11:0348 min27 Sep
Singapore02:01 → 04:3612:320 min12:3248 min27 Sep
Sydney04:01 → 06:3611:230 min11:2348 min27 Sep
Suva06:01 → 08:3611:340 min11:3448 min27 Sep
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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