Ruling · Durgā Navamī · 2010

Sunday 14 November

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 19 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 14 November

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 11:25  12:13 madhyāhna ends
10:3711:0111:2511:4912:1312:3713:01

48 of 48 minutes covered

Midday of Monday 15 November

Qualifies with 29 of 48 minutes. Not taken.

madhyāhna begins 11:25  12:13 madhyāhna ends
Navamī ends 11:53:18
10:3711:0111:2511:4912:1312:3713:01

29 of 48 minutes covered, the first 29

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 09:21 on Sun 14 Nov to 11:53 on Mon 15 Nov.

    2010-11-14T05:51:16Z → 2010-11-15T08:23:18Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 14th, 11:25–12:13 on the 15th.

    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 14th and 29 of 48 on the 15th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 1164 s

  5. 05

    Ruling

    Durgā Navamī, Tehran, 2010: Sunday 14 November.

    confidence: determinate

Say it like this

In Tehran, Durgā Navamī 2010 falls on Sunday 14 November. Navamī runs from 09:21 on Sun 14 Nov to 11:53 on Mon 15 Nov and covers all of madhyāhna that midday. It also reaches the next midday for 29 minutes; by the rule the first midday is taken.

ahargana.org/tehran/festivals/2010/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 14 Nov
Ahargaṇa, classicalDisc centre, no refractionSun 14 Nov
compat-drikpanchangComparison profileSun 14 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 14thCoveredMadhyāhna 15thCoveredRuled
Los Angeles21:51 → 00:2311:1348 min11:130 min14 Nov
Chicago23:51 → 02:2311:1148 min11:110 min14 Nov
Jersey City00:51 → 03:2311:1748 min11:170 min14 Nov
Port of Spain01:51 → 04:2311:2648 min11:270 min14 Nov
London05:51 → 08:2311:2148 min11:210 min14 Nov
Durban07:51 → 10:2311:1648 min11:170 min14 Nov
Dubai09:51 → 12:2311:3948 min11:3944 min14 Nov
Delhi11:21 → 13:5311:4148 min11:4148 min14 Nov
Kolkata11:21 → 13:5310:5724 min10:5748 min14 Nov
Singapore13:51 → 16:2312:250 min12:2548 min15 Nov
Sydney16:51 → 19:2312:160 min12:1648 min15 Nov
Suva18:51 → 21:2312:270 min12:2748 min15 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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