Ruling · Durgā Navamī · 2099

Saturday 21 November

Determinatein Perth, under the Rashtriya Panchang method. Clear of every threshold by 117 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 Friday 20 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
10:5111:1511:3912:0312:2712:5113:15

0 of 48 minutes covered

Midday of Saturday 21 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:39  12:27 madhyāhna ends
10:5111:1511:3912:0312:2712:5113:15

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 14:24 on Fri 20 Nov to 16:53 on Sat 21 Nov.

    2099-11-20T06:23:31Z → 2099-11-21T08:52:44Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 20th, 11:39–12:27 on the 21st.

    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 20th and 48 of 48 on the 21st.

    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 7013 s

  5. 05

    Ruling

    Durgā Navamī, Perth, 2099: Saturday 21 November.

    confidence: determinate

Say it like this

In Perth, Durgā Navamī 2099 falls on Saturday 21 November. Navamī runs from 14:24 on Fri 20 Nov to 16:53 on Sat 21 Nov and covers all of madhyāhna that midday.

ahargana.org/perth/festivals/2099/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 21 Nov
Ahargaṇa, classicalDisc centre, no refractionSat 21 Nov
compat-drikpanchangComparison profileSat 21 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 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles22:24 → 00:5311:1548 min11:150 min20 Nov
Chicago00:24 → 02:5311:1248 min11:130 min20 Nov
Jersey City01:24 → 03:5311:1848 min11:180 min20 Nov
Port of Spain02:24 → 04:5311:2848 min11:280 min20 Nov
London06:24 → 08:5311:2248 min11:220 min20 Nov
Durban08:24 → 10:5311:1848 min11:180 min20 Nov
Dubai10:24 → 12:5311:4148 min11:4148 min20 Nov
Delhi11:54 → 14:2311:4337 min11:4348 min20 Nov
Kolkata11:54 → 14:2310:580 min10:5948 min21 Nov
Singapore14:24 → 16:5312:260 min12:2748 min21 Nov
Sydney17:24 → 19:5312:170 min12:1748 min21 Nov
Suva18:24 → 20:5311:280 min11:2848 min21 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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