Ruling · Durgā Navamī · 1980

Sunday 16 November

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 282 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 16 November

Taken. The only midday Navamī reaches.

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

48 of 48 minutes covered

Midday of Monday 17 November

Navamī is absent from madhyāhna. Not taken.

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

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 06:43 on Sun 16 Nov to 05:06 on Mon 17 Nov.

    1980-11-16T03:13:01Z → 1980-11-17T01:36:10Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 16th, 11:25–12:13 on the 17th.

    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 16th and 0 of 48 on the 17th.

    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 16917 s

  5. 05

    Ruling

    Durgā Navamī, Tehran, 1980: Sunday 16 November.

    confidence: determinate

Say it like this

In Tehran, Durgā Navamī 1980 falls on Sunday 16 November. Navamī runs from 06:43 on Sun 16 Nov to 05:06 on Mon 17 Nov and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1980/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 16 Nov
Ahargaṇa, classicalDisc centre, no refractionSun 16 Nov
compat-drikpanchangComparison profileSun 16 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 16thCoveredMadhyāhna 17thCoveredRuled
Los Angeles19:13 → 17:3611:1448 min11:140 min16 Nov
Chicago21:13 → 19:3611:1148 min11:120 min16 Nov
Jersey City22:13 → 20:3611:1748 min11:170 min16 Nov
Port of Spain23:13 → 21:3611:2748 min11:270 min16 Nov
London03:13 → 01:3611:2148 min11:210 min16 Nov
Durban05:13 → 03:3611:1748 min11:170 min16 Nov
Dubai07:13 → 05:3611:3948 min11:400 min16 Nov
Delhi08:43 → 07:0611:4248 min11:420 min16 Nov
Kolkata08:43 → 07:0610:5748 min10:570 min16 Nov
Singapore10:43 → 09:0611:5548 min11:560 min16 Nov
Sydney14:13 → 12:3612:160 min12:1620 min17 Nov
Suva15:13 → 13:3611:270 min11:2748 min17 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

About Ahargaṇa