Ruling · Durgā Navamī · 1926

Sunday 14 November

Boundaryin Tehran, under the Rashtriya Panchang method. A threshold is only 3 min 23 s away. Say “contested”.

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 Saturday 13 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:19  12:07 madhyāhna ends
10:3110:5511:1911:4312:0712:3112:55

0 of 48 minutes covered

Midday of Sunday 14 November

Taken. Navamī reaches neither midday; the rule takes the second day.

madhyāhna begins 11:20  12:08 madhyāhna ends
Navamī ends 11:16:52
10:3210:5611:2011:4412:0812:3212:56

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 13:28 on Sat 13 Nov to 11:16 on Sun 14 Nov.

    1926-11-13T10:02:54Z → 1926-11-14T07:51:09Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:19–12:07 on the 13th, 11:20–12:08 on the 14th.

    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 13th and 0 of 48 on the 14th.

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

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: purvaviddha → second-day · margin 203 s < 300 s

  5. 05

    Ruling

    Durgā Navamī, Tehran, 1926: Sunday 14 November.

    confidence: boundary (margin)

Say it like this

In Tehran, Durgā Navamī 1926 falls on Sunday 14 November. Navamī runs from 13:28 on Sat 13 Nov to 11:16 on Sun 14 Nov, and reaches madhyāhna on neither day. It is 3 min 23 s from a threshold: treat the date as contested.

ahargana.org/tehran/festivals/1926/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 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles02:03 → 23:5111:1348 min11:130 min13 Nov
Chicago04:03 → 01:5111:1148 min11:110 min13 Nov
Jersey City05:03 → 02:5111:1648 min11:170 min13 Nov
Port of Spain06:03 → 03:5111:2648 min11:260 min13 Nov
London10:03 → 07:5111:2048 min11:210 min13 Nov
Durban12:03 → 09:5111:161 min11:160 min13 Nov
Dubai14:03 → 11:5111:390 min11:3912 min14 Nov
Delhi15:33 → 13:2111:410 min11:4148 min14 Nov
Kolkata15:33 → 13:2110:570 min10:5748 min14 Nov
Singapore17:03 → 14:5111:250 min11:2548 min14 Nov
Sydney20:03 → 17:5111:160 min11:1648 min14 Nov
Suva22:03 → 19:5111:270 min11:2748 min14 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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