Ruling · Durgā Navamī · 2013

Monday 11 November

Determinatein Riyadh, under the Rashtriya Panchang method. Clear of every threshold by 390 minutes.

Decide it for

RiyadhDelhiKolkataSingaporeSydneyJersey City

24°41′ N 46°43′ E · Asia/Riyadh · GeoNames 108410

The two middays

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

Midday of Sunday 10 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:13  12:01 madhyāhna ends
10:2510:4911:1311:3712:0112:2512:49

0 of 48 minutes covered

Midday of Monday 11 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:13  12:01 madhyāhna ends
10:2510:4911:1311:3712:0112:2512:49

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 20:03 on Sun 10 Nov to 18:31 on Mon 11 Nov.

    2013-11-10T17:02:33Z → 2013-11-11T15:30:40Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:13–12:01 on the 10th, 11:13–12:01 on the 11th.

    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 10th and 48 of 48 on the 11th.

    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 23379 s

  5. 05

    Ruling

    Durgā Navamī, Riyadh, 2013: Monday 11 November.

    confidence: determinate

Say it like this

In Riyadh, Durgā Navamī 2013 falls on Monday 11 November. Navamī runs from 20:03 on Sun 10 Nov to 18:31 on Mon 11 Nov and covers all of madhyāhna that midday.

ahargana.org/riyadh/festivals/2013/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 11 Nov
Ahargaṇa, classicalDisc centre, no refractionMon 11 Nov
compat-drikpanchangComparison profileMon 11 Nov
No institution has a recorded ruling for Riyadh.

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 10thCoveredMadhyāhna 11thCoveredRuled
Los Angeles09:03 → 07:3111:1348 min11:130 min10 Nov
Chicago11:03 → 09:3111:1048 min11:100 min10 Nov
Jersey City12:03 → 10:3111:162 min11:160 min10 Nov
Port of Spain13:03 → 11:3111:260 min11:265 min11 Nov
London17:03 → 15:3111:200 min11:2048 min11 Nov
Durban19:03 → 17:3111:160 min11:1648 min11 Nov
Dubai21:03 → 19:3111:390 min11:3948 min11 Nov
Delhi22:33 → 21:0111:410 min11:4148 min11 Nov
Kolkata22:33 → 21:0110:560 min10:5648 min11 Nov
Singapore01:03 → 23:3112:250 min12:2548 min11 Nov
Sydney04:03 → 02:3112:150 min12:1548 min11 Nov
Suva06:03 → 04:3112:260 min12:2648 min11 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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