Ruling · Durgā Navamī · 1957

Thursday 31 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 353 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 Thursday 31 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:24  12:12 madhyāhna ends
10:3611:0011:2411:4812:1212:3613:00

48 of 48 minutes covered

Midday of Friday 1 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:24  12:12 madhyāhna ends
10:3611:0011:2411:4812:1212:3613:00

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 03:16 on Thu 31 Oct to 05:31 on Fri 1 Nov.

    1957-10-30T23:45:55Z → 1957-11-01T02:01:03Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:24–12:12 on the 31st, 11:24–12:12 on the 1st.

    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 31st and 0 of 48 on the 1st.

    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 21162 s

  5. 05

    Ruling

    Durgā Navamī, Tehran, 1957: Thursday 31 October.

    confidence: determinate

Say it like this

In Tehran, Durgā Navamī 1957 falls on Thursday 31 October. Navamī runs from 03:16 on Thu 31 Oct to 05:31 on Fri 1 Nov and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1957/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 31 Oct
Ahargaṇa, classicalDisc centre, no refractionThu 31 Oct
compat-drikpanchangComparison profileThu 31 Oct
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 30thCoveredMadhyāhna 1stCoveredRuled
Los Angeles15:46 → 18:0111:120 min11:120 min31 Oct
Chicago17:46 → 20:0111:100 min11:100 min31 Oct
Jersey City18:46 → 21:0111:160 min11:160 min31 Oct
Port of Spain19:46 → 22:0111:260 min11:260 min31 Oct
London23:46 → 02:0111:200 min11:200 min31 Oct
Durban01:46 → 04:0111:160 min11:160 min31 Oct
Dubai03:46 → 06:0111:380 min11:380 min31 Oct
Delhi05:16 → 07:3111:410 min11:410 min31 Oct
Kolkata05:16 → 07:3110:560 min10:560 min31 Oct
Singapore07:16 → 09:3111:540 min11:540 min31 Oct
Sydney09:46 → 12:0111:150 min11:1546 min31 Oct
Suva11:46 → 14:0111:260 min11:2648 min31 Oct
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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