Ruling · Durgā Navamī · 1907

Wednesday 13 November

Determinatein Datong, under the Rashtriya Panchang method. Clear of every threshold by 14 minutes.

Decide it for

DatongDelhiKolkataSingaporeSydneyJersey City

40°06′ N 113°17′ E · Asia/Shanghai · GeoNames 2037799

The two middays

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

Midday of Wednesday 13 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:47  12:35 madhyāhna ends
Navamī begins 12:20:41
10:5911:2311:4712:1112:3512:5913:23

14 of 48 minutes covered, the last 14

Midday of Thursday 14 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:47  12:35 madhyāhna ends
10:5911:2311:4712:1112:3512:5913:23

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 12:21 on Wed 13 Nov to 10:45 on Thu 14 Nov.

    1907-11-13T04:20:42Z → 1907-11-14T02:44:55Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:47–12:35 on the 13th, 11:47–12:35 on the 14th.

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

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 14 of 48 minutes on the 13th and 0 of 48 on the 14th.

    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 848 s

  5. 05

    Ruling

    Durgā Navamī, Datong, 1907: Wednesday 13 November.

    confidence: determinate

Say it like this

In Datong, Durgā Navamī 1907 falls on Wednesday 13 November. Navamī runs from 12:21 on Wed 13 Nov to 10:45 on Thu 14 Nov and covers 14 of 48 minutes of madhyāhna that midday.

ahargana.org/datong/festivals/1907/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 13 Nov
Ahargaṇa, classicalDisc centre, no refractionWed 13 Nov
compat-drikpanchangComparison profileWed 13 Nov
No institution has a recorded ruling for Datong.

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 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles20:21 → 18:4511:1348 min11:130 min13 Nov
Chicago22:21 → 20:4511:1148 min11:110 min13 Nov
Jersey City23:21 → 21:4511:1648 min11:170 min13 Nov
Port of Spain00:21 → 22:4511:2648 min11:260 min13 Nov
London04:21 → 02:4511:2048 min11:210 min13 Nov
Durban06:21 → 04:4511:1648 min11:160 min13 Nov
Dubai08:02 → 06:2611:2048 min11:200 min13 Nov
Delhi09:51 → 08:1511:4148 min11:410 min13 Nov
Kolkata09:51 → 08:1510:5748 min10:570 min13 Nov
Singapore11:21 → 09:4511:2548 min11:250 min13 Nov
Sydney14:21 → 12:4511:160 min11:1648 min14 Nov
Suva16:16 → 14:4011:220 min11:2248 min14 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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