Ruling · Mahānavamī · 1990

Friday 28 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 611 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 Friday 28 September

Taken. The only midday Navamī reaches.

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

48 of 48 minutes covered

Midday of Saturday 29 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 23:10 on Thu 27 Sep to 00:56 on Sat 29 Sep.

    1990-09-27T15:10:07Z → 1990-09-28T16:55:35Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:06–11:54 on the 28th, 11:06–11:54 on the 29th.

    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 28th and 0 of 48 on the 29th.

    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 36632 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 1990: Friday 28 September.

    confidence: determinate

Say it like this

In Daqing, Mahānavamī 1990 falls on Friday 28 September. Navamī runs from 23:10 on Thu 27 Sep to 00:56 on Sat 29 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1990/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 28 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 28 Sep
compat-drikpanchangComparison profileFri 28 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 27thCoveredMadhyāhna 28thCoveredRuled
Los Angeles08:10 → 09:5612:2048 min12:190 min27 Sep
Chicago10:10 → 11:5612:1748 min12:170 min27 Sep
Jersey City11:10 → 12:5612:2348 min12:2333 min27 Sep
Port of Spain11:10 → 12:5611:3348 min11:3348 min27 Sep
London16:10 → 17:5612:270 min12:2748 min28 Sep
Durban17:10 → 18:5611:230 min11:2348 min28 Sep
Dubai19:10 → 20:5611:460 min11:4548 min28 Sep
Delhi20:40 → 22:2611:480 min11:4848 min28 Sep
Kolkata20:40 → 22:2611:040 min11:0348 min28 Sep
Singapore23:10 → 00:5612:320 min12:3148 min28 Sep
Sydney01:10 → 02:5611:230 min11:2248 min28 Sep
Suva03:10 → 04:5611:340 min11:3348 min28 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

About Ahargaṇa