Ruling · Durgā Navamī · 2097

Wednesday 13 November

Determinatein Perth, under the Rashtriya Panchang method. Clear of every threshold by 472 minutes.

Decide it for

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 Wednesday 13 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

48 of 48 minutes covered

Midday of Thursday 14 November

Navamī is absent from madhyāhna. Not taken.

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

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 02:21 on Wed 13 Nov to 03:45 on Thu 14 Nov.

    2097-11-12T18:20:33Z → 2097-11-13T19:45:29Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 13th, 11:38–12:26 on the 14th.

    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 13th and 0 of 48 on the 14th.

    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 28323 s

  5. 05

    Ruling

    Durgā Navamī, Perth, 2097: Wednesday 13 November.

    confidence: determinate

Say it like this

In Perth, Durgā Navamī 2097 falls on Wednesday 13 November. Navamī runs from 02:21 on Wed 13 Nov to 03:45 on Thu 14 Nov and covers all of madhyāhna that midday.

ahargana.org/perth/festivals/2097/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 13 Nov
Ahargaṇa, classicalDisc centre, no refractionWed 13 Nov
compat-drikpanchangComparison profileWed 13 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 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles10:21 → 11:4511:1348 min11:1432 min12 Nov
Chicago12:21 → 13:4511:110 min11:1148 min13 Nov
Jersey City13:21 → 14:4511:170 min11:1748 min13 Nov
Port of Spain14:21 → 15:4511:270 min11:2748 min13 Nov
London18:21 → 19:4511:210 min11:2148 min13 Nov
Durban20:21 → 21:4511:170 min11:1748 min13 Nov
Dubai22:21 → 23:4511:390 min11:3948 min13 Nov
Delhi23:51 → 01:1511:410 min11:4248 min13 Nov
Kolkata23:51 → 01:1510:570 min10:5748 min13 Nov
Singapore02:21 → 03:4512:250 min12:2548 min13 Nov
Sydney05:21 → 06:4512:160 min12:1648 min13 Nov
Suva06:21 → 07:4511:270 min11:2748 min13 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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