Ruling · Mahānavamī · 1921

Sunday 9 October

Boundaryin Erbil, under the Rashtriya Panchang method. A threshold is only 2 min 21 s away. Say “contested”.

Decide it for

ErbilDelhiKolkataSingaporeSydneyJersey City

36°11′ N 44°01′ E · Asia/Baghdad · GeoNames 95446

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Sunday 9 October

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

madhyāhna begins 11:27  12:15 madhyāhna ends
Navamī begins 12:12:48
10:3911:0311:2711:5112:1512:3913:03

2 of 48 minutes covered, the last 2

Midday of Monday 10 October

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:27  12:15 madhyāhna ends
10:3911:0311:2711:5112:1512:3913:03

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 12:13 on Sun 9 Oct to 14:31 on Mon 10 Oct.

    1921-10-09T09:12:48Z → 1921-10-10T11:31:23Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:27–12:15 on the 9th, 11:27–12:15 on the 10th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 2 of 48 minutes on the 9th and 48 of 48 on the 10th.

    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 141 s < 300 s

  5. 05

    Ruling

    Mahānavamī, Erbil, 1921: Sunday 9 October.

    confidence: boundary (margin)

Say it like this

In Erbil, Mahānavamī 1921 falls on Sunday 9 October. Navamī runs from 12:13 on Sun 9 Oct to 14:31 on Mon 10 Oct and covers 2 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken. It is 2 min 21 s from a threshold: treat the date as contested.

ahargana.org/erbil/festivals/1921/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 9 Oct
Ahargaṇa, classicalDisc centre, no refractionSun 9 Oct
compat-drikpanchangComparison profileSun 9 Oct
No institution has a recorded ruling for Erbil.

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 9thCoveredMadhyāhna 10thCoveredRuled
Los Angeles01:13 → 03:3111:1648 min11:160 min9 Oct
Chicago04:13 → 06:3112:1448 min12:130 min9 Oct
Jersey City04:13 → 06:3111:1948 min11:190 min9 Oct
Port of Spain05:13 → 07:3111:2948 min11:290 min9 Oct
London09:13 → 11:3111:2348 min11:238 min9 Oct
Durban11:13 → 13:3111:2048 min11:1948 min9 Oct
Dubai13:13 → 15:3111:420 min11:4248 min10 Oct
Delhi14:43 → 17:0111:440 min11:4448 min10 Oct
Kolkata14:43 → 17:0111:000 min11:0048 min10 Oct
Singapore16:13 → 18:3111:280 min11:2848 min10 Oct
Sydney19:13 → 21:3111:190 min11:1948 min10 Oct
Suva21:13 → 23:3111:300 min11:3048 min10 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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