Ruling · Durgā Navamī · 2086

Friday 15 November

Determinatein Perth, under the Rashtriya Panchang method. Clear of every threshold by 608 minutes.

Decide it for

PerthDelhiKolkataSingaporeSydneyJersey City

31°57′ S 115°52′ E · Australia/Perth · GeoNames 2063523

The two middays

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

Midday of Thursday 14 November

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 Friday 15 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:38  12:26 madhyāhna ends
10:5011:1411:3812:0212:2612:5013:14

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 00:28 on Fri 15 Nov to 22:34 on Fri 15 Nov.

    2086-11-14T16:28:27Z → 2086-11-15T14:33:47Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 14th, 11:38–12:26 on the 15th.

    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 14th and 48 of 48 on the 15th.

    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 36493 s

  5. 05

    Ruling

    Durgā Navamī, Perth, 2086: Friday 15 November.

    confidence: determinate

Say it like this

In Perth, Durgā Navamī 2086 falls on Friday 15 November. Navamī runs from 00:28 on Fri 15 Nov to 22:34 on Fri 15 Nov and covers all of madhyāhna that midday.

ahargana.org/perth/festivals/2086/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 15 Nov
Ahargaṇa, classicalDisc centre, no refractionFri 15 Nov
compat-drikpanchangComparison profileFri 15 Nov
No institution has a recorded ruling for Perth.

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

The rule, as data

/rules/durga-navami · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Navamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 9 Aksaya navami (purvahnavyapini), Jagaddhatri puja (Bengal), (udayavyapini one muhurta), Anla navami (Orissa), Durga navami (purvaviddha), Gauri vrata.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceNavamīMadhyāhna 14thCoveredMadhyāhna 15thCoveredRuled
Los Angeles08:28 → 06:3411:1448 min11:140 min14 Nov
Chicago10:28 → 08:3411:1148 min11:110 min14 Nov
Jersey City11:28 → 09:3411:1736 min11:170 min14 Nov
Port of Spain12:28 → 10:3411:270 min11:270 min15 Nov
London16:28 → 14:3411:210 min11:2148 min15 Nov
Durban18:28 → 16:3411:170 min11:1748 min15 Nov
Dubai20:28 → 18:3411:390 min11:3948 min15 Nov
Delhi21:58 → 20:0411:420 min11:4248 min15 Nov
Kolkata21:58 → 20:0410:570 min10:5748 min15 Nov
Singapore00:28 → 22:3412:250 min12:2548 min15 Nov
Sydney03:28 → 01:3412:160 min12:1648 min15 Nov
Suva04:28 → 02:3411:270 min11:2748 min15 Nov
Profile · tradition
pac-rp@2026.1 · smarta
Rule
durga-navami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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