Ruling · Durgā Navamī · 2006

Tuesday 31 October

Boundaryin Coimbatore, under the Rashtriya Panchang method. A threshold is only 4 min 50 s away. Say “contested”.

Decide it for

CoimbatoreDelhiKolkataSingaporeSydneyJersey City

11°00′ N 76°58′ E · Asia/Kolkata · GeoNames 1273865

The two middays

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

Midday of Monday 30 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:42  12:30 madhyāhna ends
10:5411:1811:4212:0612:3012:5413:18

0 of 48 minutes covered

Midday of Tuesday 31 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:42  12:30 madhyāhna ends
Navamī ends 12:24:53
10:5411:1811:4212:0612:3012:5413:18

43 of 48 minutes covered, the first 43

Navamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Navamī runs from 14:13 on Mon 30 Oct to 12:25 on Tue 31 Oct.

    2006-10-30T08:42:58Z → 2006-10-31T06:54:53Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:42–12:30 on the 30th, 11:42–12:30 on the 31st.

    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 30th and 43 of 48 on the 31st.

    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 290 s < 300 s

  5. 05

    Ruling

    Durgā Navamī, Coimbatore, 2006: Tuesday 31 October.

    confidence: boundary (margin)

Say it like this

In Coimbatore, Durgā Navamī 2006 falls on Tuesday 31 October. Navamī runs from 14:13 on Mon 30 Oct to 12:25 on Tue 31 Oct and covers 43 of 48 minutes of madhyāhna that midday. It is 4 min 50 s from a threshold: treat the date as contested.

ahargana.org/coimbatore/festivals/2006/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 31 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 31 Oct
compat-drikpanchangComparison profileTue 31 Oct
No institution has a recorded ruling for Coimbatore.

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 31stCoveredRuled
Los Angeles00:43 → 22:5511:1248 min11:120 min30 Oct
Chicago02:43 → 00:5511:1048 min11:100 min30 Oct
Jersey City03:43 → 01:5511:1648 min11:160 min30 Oct
Port of Spain04:43 → 02:5511:2648 min11:260 min30 Oct
London08:43 → 06:5511:2048 min11:200 min30 Oct
Durban10:43 → 08:5511:1648 min11:160 min30 Oct
Dubai12:43 → 10:5511:380 min11:380 min31 Oct
Delhi14:13 → 12:2511:410 min11:4144 min31 Oct
Kolkata14:13 → 12:2510:560 min10:5648 min31 Oct
Singapore16:43 → 14:5512:240 min12:2448 min31 Oct
Sydney19:43 → 17:5512:150 min12:1548 min31 Oct
Suva20:43 → 18:5511:260 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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