Ruling · Durgā Navamī · 2037

Sunday 15 November

Determinatein Cairo, under the Rashtriya Panchang method. Clear of every threshold by 8 min 02 s.

Decide it for

30°04′ N 31°15′ E · Africa/Cairo · GeoNames 360630

The two middays

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

Midday of Sunday 15 November

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

madhyāhna begins 11:15  12:03 madhyāhna ends
10:2710:5111:1511:3912:0312:2712:51

48 of 48 minutes covered

Midday of Monday 16 November

Qualifies with 8 of 48 minutes. Not taken.

madhyāhna begins 11:16  12:04 madhyāhna ends
Navamī ends 11:23:42
10:2810:5211:1611:4012:0412:2812:52

8 of 48 minutes covered, the first 8

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 09:01 on Sun 15 Nov to 11:24 on Mon 16 Nov.

    2037-11-15T07:01:22Z → 2037-11-16T09:23:43Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:15–12:03 on the 15th, 11:16–12:04 on the 16th.

    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 15th and 8 of 48 on the 16th.

    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 482 s

  5. 05

    Ruling

    Durgā Navamī, Cairo, 2037: Sunday 15 November.

    confidence: determinate

Say it like this

In Cairo, Durgā Navamī 2037 falls on Sunday 15 November. Navamī runs from 09:01 on Sun 15 Nov to 11:24 on Mon 16 Nov and covers all of madhyāhna that midday. It also reaches the next midday for 8 minutes; by the rule the first midday is taken.

ahargana.org/cairo/festivals/2037/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 15 Nov
Ahargaṇa, classicalDisc centre, no refractionSun 15 Nov
compat-drikpanchangComparison profileSun 15 Nov
No institution has a recorded ruling for Cairo.

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 15thCoveredMadhyāhna 16thCoveredRuled
Los Angeles23:01 → 01:2411:1448 min11:140 min15 Nov
Chicago01:01 → 03:2411:1148 min11:110 min15 Nov
Jersey City02:01 → 04:2411:1748 min11:170 min15 Nov
Port of Spain03:01 → 05:2411:2748 min11:270 min15 Nov
London07:01 → 09:2411:2148 min11:210 min15 Nov
Durban09:01 → 11:2411:1748 min11:177 min15 Nov
Dubai11:01 → 13:2411:3948 min11:3948 min15 Nov
Delhi12:31 → 14:5411:420 min11:4248 min16 Nov
Kolkata12:31 → 14:5410:570 min10:5748 min16 Nov
Singapore15:01 → 17:2412:250 min12:2548 min16 Nov
Sydney18:01 → 20:2412:160 min12:1648 min16 Nov
Suva19:01 → 21:2411:270 min11:2748 min16 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

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