Ruling · Durgā Navamī · 2023

Tuesday 21 November

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 609 minutes.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

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

Midday of Tuesday 21 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

48 of 48 minutes covered

Midday of Wednesday 22 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

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 01:17 on Tue 21 Nov to 23:10 on Tue 21 Nov.

    2023-11-20T21:46:56Z → 2023-11-21T19:40:18Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:26–12:14 on the 21st, 11:26–12:14 on the 22nd.

    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 21st and 0 of 48 on the 22nd.

    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 36538 s

  5. 05

    Ruling

    Durgā Navamī, Tehran, 2023: Tuesday 21 November.

    confidence: determinate

Say it like this

In Tehran, Durgā Navamī 2023 falls on Tuesday 21 November. Navamī runs from 01:17 on Tue 21 Nov to 23:10 on Tue 21 Nov and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/2023/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 21 Nov
Ahargaṇa, classicalDisc centre, no refractionTue 21 Nov
compat-drikpanchangComparison profileTue 21 Nov
No institution has a recorded ruling for Tehran.

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 Angeles13:47 → 11:4011:140 min11:1526 min21 Nov
Chicago15:47 → 13:4011:120 min11:1248 min21 Nov
Jersey City16:47 → 14:4011:180 min11:1848 min21 Nov
Port of Spain17:47 → 15:4011:280 min11:2848 min21 Nov
London21:47 → 19:4011:220 min11:2248 min21 Nov
Durban23:47 → 21:4011:180 min11:1848 min21 Nov
Dubai01:47 → 23:4011:400 min11:4048 min21 Nov
Delhi03:17 → 01:1011:420 min11:4348 min21 Nov
Kolkata03:17 → 01:1010:580 min10:5848 min21 Nov
Singapore05:47 → 03:4012:260 min12:2648 min21 Nov
Sydney08:47 → 06:4012:170 min12:1748 min21 Nov
Suva09:47 → 07:4011:280 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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