Ruling · Durgā Navamī · 1936

Monday 23 November

Boundaryin Ibadan, under the Rashtriya Panchang method. A threshold is only 2 min 13 s away. Say “contested”.

Decide it for

IbadanDelhiKolkataSingaporeSydneyJersey City

7°23′ N 3°54′ E · Africa/Lagos · GeoNames 2339354

The two middays

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

Midday of Sunday 22 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:07  12:55 madhyāhna ends
11:1911:4312:0712:3112:5513:1913:43

0 of 48 minutes covered

Midday of Monday 23 November

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

madhyāhna begins 12:07  12:55 madhyāhna ends
Navamī ends 12:04:35
11:1911:4312:0712:3112:5513:1913:43

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 13:44 on Sun 22 Nov to 12:05 on Mon 23 Nov.

    1936-11-22T12:44:08Z → 1936-11-23T11:04:35Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:07–12:55 on the 22nd, 12:07–12:55 on the 23rd.

    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 22nd and 0 of 48 on the 23rd.

    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 133 s < 300 s

  5. 05

    Ruling

    Durgā Navamī, Ibadan, 1936: Monday 23 November.

    confidence: boundary (margin)

Say it like this

In Ibadan, Durgā Navamī 1936 falls on Monday 23 November. Navamī runs from 13:44 on Sun 22 Nov to 12:05 on Mon 23 Nov, and reaches madhyāhna on neither day. It is 2 min 13 s from a threshold: treat the date as contested.

ahargana.org/ibadan/festivals/1936/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 23 Nov
Ahargaṇa, classicalDisc centre, no refractionMon 23 Nov
compat-drikpanchangComparison profileMon 23 Nov
No institution has a recorded ruling for Ibadan.

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 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles04:44 → 03:0511:1548 min11:150 min22 Nov
Chicago06:44 → 05:0511:1348 min11:130 min22 Nov
Jersey City07:44 → 06:0511:1848 min11:190 min22 Nov
Port of Spain08:44 → 07:0511:2848 min11:290 min22 Nov
London12:44 → 11:0511:220 min11:230 min23 Nov
Durban14:44 → 13:0511:180 min11:1848 min23 Nov
Dubai16:44 → 15:0511:410 min11:4148 min23 Nov
Delhi18:14 → 16:3511:430 min11:4348 min23 Nov
Kolkata18:14 → 16:3510:590 min10:5948 min23 Nov
Singapore20:04 → 18:2511:470 min11:4748 min23 Nov
Sydney22:44 → 21:0511:170 min11:1848 min23 Nov
Suva00:44 → 23:0511:280 min11:2948 min23 Nov
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

About Ahargaṇa