Ruling · Mahānavamī · 2085

Friday 28 September

Boundaryin Daqing, under the Rashtriya Panchang method. A threshold is only 1 min 00 s away. Say “contested”.

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 Thursday 27 September

Navamī is absent from madhyāhna. Not taken.

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

0 of 48 minutes covered

Midday of Friday 28 September

Taken. The only midday Navamī reaches.

madhyāhna begins 11:06  11:54 madhyāhna ends
Navamī ends 11:53:25
10:1810:4211:0611:3011:5412:1812:42

47 of 48 minutes covered, the first 47

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 13:40 on Thu 27 Sep to 11:53 on Fri 28 Sep.

    2085-09-27T05:40:01Z → 2085-09-28T03:53:25Z

  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 0 of 48 minutes on the 27th and 47 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 60 s < 300 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 2085: Friday 28 September.

    confidence: boundary (margin)

Say it like this

In Daqing, Mahānavamī 2085 falls on Friday 28 September. Navamī runs from 13:40 on Thu 27 Sep to 11:53 on Fri 28 Sep and covers 47 of 48 minutes of madhyāhna that midday. It is 1 min 00 s from a threshold: treat the date as contested.

ahargana.org/daqing/festivals/2085/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 Angeles22:40 → 20:5312:2048 min12:190 min27 Sep
Chicago00:40 → 22:5312:1748 min12:170 min27 Sep
Jersey City01:40 → 23:5312:2348 min12:230 min27 Sep
Port of Spain01:40 → 23:5311:3348 min11:330 min27 Sep
London06:40 → 04:5312:2748 min12:270 min27 Sep
Durban07:40 → 05:5311:2348 min11:230 min27 Sep
Dubai09:40 → 07:5311:4648 min11:450 min27 Sep
Delhi11:10 → 09:2311:4848 min11:480 min27 Sep
Kolkata11:10 → 09:2311:0441 min11:030 min27 Sep
Singapore13:40 → 11:5312:320 min12:310 min28 Sep
Sydney15:40 → 13:5311:230 min11:2248 min28 Sep
Suva17:40 → 15:5311:340 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

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