Ruling · Durgā Navamī · 2091

Monday 19 November

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 203 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 Sunday 18 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

Midday of Monday 19 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

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 15:37 on Sun 18 Nov to 17:01 on Mon 19 Nov.

    2091-11-18T12:06:36Z → 2091-11-19T13:30:50Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:26–12:14 on the 18th, 11:26–12:14 on the 19th.

    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 18th and 48 of 48 on the 19th.

    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 12183 s

  5. 05

    Ruling

    Durgā Navamī, Tehran, 2091: Monday 19 November.

    confidence: determinate

Say it like this

In Tehran, Durgā Navamī 2091 falls on Monday 19 November. Navamī runs from 15:37 on Sun 18 Nov to 17:01 on Mon 19 Nov and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/2091/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 19 Nov
Ahargaṇa, classicalDisc centre, no refractionMon 19 Nov
compat-drikpanchangComparison profileMon 19 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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles04:07 → 05:3111:1448 min11:150 min18 Nov
Chicago06:07 → 07:3111:1248 min11:120 min18 Nov
Jersey City07:07 → 08:3111:1848 min11:180 min18 Nov
Port of Spain08:07 → 09:3111:2748 min11:280 min18 Nov
London12:07 → 13:3111:223 min11:2248 min18 Nov
Durban14:07 → 15:3111:170 min11:1848 min19 Nov
Dubai16:07 → 17:3111:400 min11:4048 min19 Nov
Delhi17:37 → 19:0111:420 min11:4348 min19 Nov
Kolkata17:37 → 19:0110:580 min10:5848 min19 Nov
Singapore20:07 → 21:3112:260 min12:2648 min19 Nov
Sydney23:07 → 00:3112:170 min12:1748 min19 Nov
Suva00:07 → 01:3111:280 min11:2848 min19 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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