Ruling · Mahānavamī · 2004

Friday 22 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 14 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 21 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:25  12:13 madhyāhna ends
Navamī begins 12:27:02
10:3711:0111:2511:4912:1312:3713:01

0 of 48 minutes covered

Midday of Friday 22 October

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

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 12:27 on Thu 21 Oct to 10:35 on Fri 22 Oct.

    2004-10-21T08:57:03Z → 2004-10-22T07:04:42Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 21st, 11:25–12:13 on the 22nd.

    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 21st and 0 of 48 on the 22nd.

    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 862 s

  5. 05

    Ruling

    Mahānavamī, Tehran, 2004: Friday 22 October.

    confidence: determinate

Say it like this

In Tehran, Mahānavamī 2004 falls on Friday 22 October. Navamī runs from 12:27 on Thu 21 Oct to 10:35 on Fri 22 Oct, and reaches madhyāhna on neither day.

ahargana.org/tehran/festivals/2004/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 22 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 22 Oct
compat-drikpanchangComparison profileThu 21 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/mahanavami · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Navamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 9 Mahanavami (purvaviddha) (In Bengal it is observed as paraviddha covering one muhurta from sunrise).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104. The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceNavamīMadhyāhna 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles01:57 → 00:0512:1348 min12:130 min21 Oct
Chicago03:57 → 02:0512:1148 min12:110 min21 Oct
Jersey City04:57 → 03:0512:1748 min12:160 min21 Oct
Port of Spain04:57 → 03:0511:2748 min11:260 min21 Oct
London09:57 → 08:0512:2148 min12:210 min21 Oct
Durban10:57 → 09:0511:1748 min11:170 min21 Oct
Dubai12:57 → 11:0511:390 min11:390 min22 Oct
Delhi14:27 → 12:3511:420 min11:4148 min22 Oct
Kolkata14:27 → 12:3510:570 min10:5748 min22 Oct
Singapore16:57 → 15:0512:250 min12:2548 min22 Oct
Sydney18:57 → 17:0511:160 min11:1648 min22 Oct
Suva20:57 → 19:0511:270 min11:2748 min22 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahanavami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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