Ruling · Mahānavamī · 2071

Friday 2 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 522 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 1 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:30  12:18 madhyāhna ends
10:4211:0611:3011:5412:1812:4213:06

0 of 48 minutes covered

Midday of Friday 2 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:30  12:18 madhyāhna ends
10:4211:0611:3011:5412:1812:4213:06

48 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 21:00 on Thu 1 Oct to 23:25 on Fri 2 Oct.

    2071-10-01T17:29:36Z → 2071-10-02T19:55:23Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:30–12:18 on the 1st, 11:30–12:18 on the 2nd.

    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 1st and 48 of 48 on the 2nd.

    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 31302 s

  5. 05

    Ruling

    Mahānavamī, Tehran, 2071: Friday 2 October.

    confidence: determinate

Say it like this

In Tehran, Mahānavamī 2071 falls on Friday 2 October. Navamī runs from 21:00 on Thu 1 Oct to 23:25 on Fri 2 Oct and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/2071/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 2 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 2 Oct
compat-drikpanchangComparison profileFri 2 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 1stCoveredMadhyāhna 2ndCoveredRuled
Los Angeles10:30 → 12:5512:1848 min12:1837 min1 Oct
Chicago12:30 → 14:5512:1634 min12:1648 min1 Oct
Jersey City13:30 → 15:5512:220 min12:2148 min2 Oct
Port of Spain13:30 → 15:5511:320 min11:3148 min2 Oct
London18:30 → 20:5512:260 min12:2648 min2 Oct
Durban19:30 → 21:5511:220 min11:2248 min2 Oct
Dubai21:30 → 23:5511:440 min11:4448 min2 Oct
Delhi23:00 → 01:2511:470 min11:4648 min2 Oct
Kolkata23:00 → 01:2511:020 min11:0248 min2 Oct
Singapore01:30 → 03:5512:300 min12:3048 min2 Oct
Sydney03:30 → 05:5511:210 min11:2148 min2 Oct
Suva05:30 → 07:5511:320 min11:3248 min2 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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