Ruling · Durgā Navamī · 1911

Tuesday 31 October

Boundaryin Phoenix, under the Rashtriya Panchang method. A threshold is only 4 min 19 s away. Say “contested”.

Decide it for

PhoenixDelhiKolkataSingaporeSydneyJersey City

33°27′ N 112°04′ W · America/Phoenix · GeoNames 5308655

The two middays

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

Midday of Monday 30 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:48  12:36 madhyāhna ends
Navamī begins 12:40:11
11:0011:2411:4812:1212:3613:0013:24

0 of 48 minutes covered

Midday of Tuesday 31 October

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 12:40 on Mon 30 Oct to 14:13 on Tue 31 Oct.

    1911-10-30T19:40:11Z → 1911-10-31T21:12:58Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:48–12:36 on the 30th, 11:48–12:36 on the 31st.

    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 30th and 48 of 48 on the 31st.

    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 259 s < 300 s

  5. 05

    Ruling

    Durgā Navamī, Phoenix, 1911: Tuesday 31 October.

    confidence: boundary (margin)

Say it like this

In Phoenix, Durgā Navamī 1911 falls on Tuesday 31 October. Navamī runs from 12:40 on Mon 30 Oct to 14:13 on Tue 31 Oct and covers all of madhyāhna that midday. It is 4 min 19 s from a threshold: treat the date as contested.

ahargana.org/phoenix/festivals/1911/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 31 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 31 Oct
compat-drikpanchangComparison profileMon 30 Oct
No institution has a recorded ruling for Phoenix.

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 30thCoveredMadhyāhna 31stCoveredRuled
Los Angeles11:40 → 13:1311:1320 min11:1248 min30 Oct
Chicago13:40 → 15:1311:100 min11:1048 min31 Oct
Jersey City14:40 → 16:1311:160 min11:1648 min31 Oct
Port of Spain15:40 → 17:1311:260 min11:2648 min31 Oct
London19:40 → 21:1311:200 min11:2048 min31 Oct
Durban21:40 → 23:1311:160 min11:1648 min31 Oct
Dubai23:21 → 00:5411:190 min11:1948 min31 Oct
Delhi01:10 → 02:4311:410 min11:4148 min31 Oct
Kolkata01:10 → 02:4310:560 min10:5648 min31 Oct
Singapore02:40 → 04:1311:240 min11:2448 min31 Oct
Sydney05:40 → 07:1311:150 min11:1548 min31 Oct
Suva07:35 → 09:0811:210 min11:2148 min31 Oct
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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