Ruling · Durgā Navamī · 1909

Sunday 21 November

Boundaryin Xining, under the Rashtriya Panchang method. A threshold is only 4 min 49 s away. Say “contested”.

Decide it for

XiningDelhiKolkataSingaporeSydneyJersey City

36°38′ N 101°45′ E · Asia/Shanghai · GeoNames 1788852

The two middays

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

Midday of Sunday 21 November

Taken. The only midday Navamī reaches.

madhyāhna begins 12:35  13:23 madhyāhna ends
Navamī begins 12:39:25
11:4712:1112:3512:5913:2313:4714:11

43 of 48 minutes covered, the last 43

Midday of Monday 22 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:35  13:23 madhyāhna ends
11:4712:1112:3512:5913:2313:4714:11

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 12:39 on Sun 21 Nov to 10:38 on Mon 22 Nov.

    1909-11-21T04:39:26Z → 1909-11-22T02:37:48Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:35–13:23 on the 21st, 12:35–13:23 on the 22nd.

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

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 43 of 48 minutes on the 21st and 0 of 48 on the 22nd.

    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 289 s < 300 s

  5. 05

    Ruling

    Durgā Navamī, Xining, 1909: Sunday 21 November.

    confidence: boundary (margin)

Say it like this

In Xining, Durgā Navamī 1909 falls on Sunday 21 November. Navamī runs from 12:39 on Sun 21 Nov to 10:38 on Mon 22 Nov and covers 43 of 48 minutes of madhyāhna that midday. It is 4 min 49 s from a threshold: treat the date as contested.

ahargana.org/xining/festivals/1909/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 21 Nov
Ahargaṇa, classicalDisc centre, no refractionSun 21 Nov
compat-drikpanchangComparison profileSun 21 Nov
No institution has a recorded ruling for Xining.

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 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles20:39 → 18:3811:1548 min11:150 min21 Nov
Chicago22:39 → 20:3811:1248 min11:130 min21 Nov
Jersey City23:39 → 21:3811:1848 min11:180 min21 Nov
Port of Spain00:39 → 22:3811:2848 min11:280 min21 Nov
London04:39 → 02:3811:2248 min11:220 min21 Nov
Durban06:39 → 04:3811:1848 min11:180 min21 Nov
Dubai08:20 → 06:1911:2148 min11:220 min21 Nov
Delhi10:09 → 08:0811:4348 min11:430 min21 Nov
Kolkata10:09 → 08:0810:5848 min10:590 min21 Nov
Singapore11:39 → 09:3811:2635 min11:270 min21 Nov
Sydney14:39 → 12:3811:170 min11:1748 min22 Nov
Suva16:34 → 14:3311:230 min11:2348 min22 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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