Ruling · Durgā Navamī · 1903

Thursday 29 October

Determinatein Perth, under the Rashtriya Panchang method. Clear of every threshold by 198 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 29 October

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 Friday 30 October

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

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 05:48 on Thu 29 Oct to 08:18 on Fri 30 Oct.

    1903-10-28T21:48:27Z → 1903-10-30T00:18:28Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 29th, 11:37–12:25 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 48 of 48 minutes on the 29th and 0 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 11890 s

  5. 05

    Ruling

    Durgā Navamī, Perth, 1903: Thursday 29 October.

    confidence: determinate

Say it like this

In Perth, Durgā Navamī 1903 falls on Thursday 29 October. Navamī runs from 05:48 on Thu 29 Oct to 08:18 on Fri 30 Oct and covers all of madhyāhna that midday.

ahargana.org/perth/festivals/1903/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 29 Oct
Ahargaṇa, classicalDisc centre, no refractionThu 29 Oct
compat-drikpanchangComparison profileThu 29 Oct
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 28thCoveredMadhyāhna 30thCoveredRuled
Los Angeles13:48 → 16:1811:130 min11:130 min29 Oct
Chicago15:48 → 18:1811:100 min11:100 min29 Oct
Jersey City16:48 → 19:1811:160 min11:160 min29 Oct
Port of Spain17:48 → 20:1811:260 min11:260 min29 Oct
London21:48 → 00:1811:200 min11:200 min29 Oct
Durban23:48 → 02:1811:160 min11:160 min29 Oct
Dubai01:29 → 03:5911:200 min11:190 min29 Oct
Delhi03:09 → 05:3911:320 min11:320 min29 Oct
Kolkata03:09 → 05:3910:470 min10:470 min29 Oct
Singapore04:43 → 07:1311:200 min11:190 min29 Oct
Sydney07:48 → 10:1811:150 min11:150 min29 Oct
Suva09:43 → 12:1311:210 min11:2148 min29 Oct
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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