Ruling · Mahānavamī · 1929

Friday 11 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 38 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 Friday 11 October

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 11:22  12:10 madhyāhna ends
Navamī begins 10:44:33
10:3410:5811:2211:4612:1012:3412:58

48 of 48 minutes covered

Midday of Saturday 12 October

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

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 10:44 on Fri 11 Oct to 13:01 on Sat 12 Oct.

    1929-10-11T07:18:49Z → 1929-10-12T09:36:09Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 11th, 11:22–12:10 on the 12th.

    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 11th and 48 of 48 on the 12th.

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

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 2289 s

  5. 05

    Ruling

    Mahānavamī, Tehran, 1929: Friday 11 October.

    confidence: determinate

Say it like this

In Tehran, Mahānavamī 1929 falls on Friday 11 October. Navamī runs from 10:44 on Fri 11 Oct to 13:01 on Sat 12 Oct and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken.

ahargana.org/tehran/festivals/1929/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 11 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 11 Oct
compat-drikpanchangComparison profileFri 11 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 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles23:19 → 01:3611:1648 min11:150 min11 Oct
Chicago01:19 → 03:3611:1348 min11:130 min11 Oct
Jersey City02:19 → 04:3611:1948 min11:190 min11 Oct
Port of Spain03:19 → 05:3611:2948 min11:290 min11 Oct
London07:19 → 09:3611:2348 min11:230 min11 Oct
Durban09:19 → 11:3611:1948 min11:1917 min11 Oct
Dubai11:19 → 13:3611:4248 min11:4148 min11 Oct
Delhi12:49 → 15:0611:440 min11:4448 min12 Oct
Kolkata12:49 → 15:0610:590 min10:5948 min12 Oct
Singapore14:19 → 16:3611:280 min11:2748 min12 Oct
Sydney17:19 → 19:3611:180 min11:1848 min12 Oct
Suva19:19 → 21:3611:290 min11:2948 min12 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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