Ruling · Durgā Navamī · 2080

Thursday 21 November

Boundaryin Daegu, under the Rashtriya Panchang method. A threshold is only 1 min 13 s away. Say “contested”.

Decide it for

DaeguDelhiKolkataSingaporeSydneyJersey City

35°52′ N 128°36′ E · Asia/Seoul · GeoNames 1835329

The two middays

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

Midday of Wednesday 20 November

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:47  12:35 madhyāhna ends
Navamī begins 12:36:31
10:5911:2311:4712:1112:3512:5913:23

0 of 48 minutes covered

Midday of Thursday 21 November

Taken. The only midday Navamī reaches.

madhyāhna begins 11:48  12:36 madhyāhna ends
11:0011:2411:4812:1212:3613:0013:24

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 12:37 on Wed 20 Nov to 14:52 on Thu 21 Nov.

    2080-11-20T03:36:31Z → 2080-11-21T05:52:03Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:47–12:35 on the 20th, 11:48–12:36 on the 21st.

    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 20th and 48 of 48 on the 21st.

    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 73 s < 300 s

  5. 05

    Ruling

    Durgā Navamī, Daegu, 2080: Thursday 21 November.

    confidence: boundary (margin)

Say it like this

In Daegu, Durgā Navamī 2080 falls on Thursday 21 November. Navamī runs from 12:37 on Wed 20 Nov to 14:52 on Thu 21 Nov and covers all of madhyāhna that midday. It is 1 min 13 s from a threshold: treat the date as contested.

ahargana.org/daegu/festivals/2080/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 21 Nov
Ahargaṇa, classicalDisc centre, no refractionThu 21 Nov
compat-drikpanchangComparison profileWed 20 Nov
No institution has a recorded ruling for Daegu.

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 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles19:37 → 21:5211:1548 min11:150 min20 Nov
Chicago21:37 → 23:5211:1248 min11:130 min20 Nov
Jersey City22:37 → 00:5211:1848 min11:180 min20 Nov
Port of Spain23:37 → 01:5211:2848 min11:280 min20 Nov
London03:37 → 05:5211:2248 min11:220 min20 Nov
Durban05:37 → 07:5211:1848 min11:180 min20 Nov
Dubai07:37 → 09:5211:4148 min11:410 min20 Nov
Delhi09:07 → 11:2211:4348 min11:430 min20 Nov
Kolkata09:07 → 11:2210:5848 min10:5923 min20 Nov
Singapore11:37 → 13:5212:2648 min12:2748 min20 Nov
Sydney14:37 → 16:5212:170 min12:1748 min21 Nov
Suva15:37 → 17:5211:280 min11:2848 min21 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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