Ruling · Mahānavamī · 1998

Wednesday 30 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 341 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 Tuesday 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

Midday of Wednesday 30 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

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 17:35 on Tue 29 Sep to 17:49 on Wed 30 Sep.

    1998-09-29T09:35:01Z → 1998-09-30T09:49:27Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:06–11:54 on the 29th, 11:06–11:54 on the 30th.

    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 29th and 48 of 48 on the 30th.

    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 20456 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 1998: Wednesday 30 September.

    confidence: determinate

Say it like this

In Daqing, Mahānavamī 1998 falls on Wednesday 30 September. Navamī runs from 17:35 on Tue 29 Sep to 17:49 on Wed 30 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1998/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 30 Sep
Ahargaṇa, classicalDisc centre, no refractionWed 30 Sep
compat-drikpanchangComparison profileWed 30 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 29thCoveredMadhyāhna 30thCoveredRuled
Los Angeles02:35 → 02:4912:1948 min12:190 min29 Sep
Chicago04:35 → 04:4912:1748 min12:160 min29 Sep
Jersey City05:35 → 05:4912:2248 min12:220 min29 Sep
Port of Spain05:35 → 05:4911:3248 min11:320 min29 Sep
London10:35 → 10:4912:2648 min12:260 min29 Sep
Durban11:35 → 11:4911:2336 min11:2227 min29 Sep
Dubai13:35 → 13:4911:450 min11:4548 min30 Sep
Delhi15:05 → 15:1911:470 min11:4748 min30 Sep
Kolkata15:05 → 15:1911:030 min11:0348 min30 Sep
Singapore17:35 → 17:4912:310 min12:3148 min30 Sep
Sydney19:35 → 19:4911:220 min11:2248 min30 Sep
Suva21:35 → 21:4911:330 min11:3348 min30 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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