Ruling · Durgā Navamī · 2017

Saturday 28 October

Determinatein Chicago, under the Rashtriya Panchang method. Clear of every threshold by 259 minutes.

Decide it for

ChicagoDelhiKolkataSingaporeSydneyJersey City

41°51′ N 87°39′ W · America/Chicago · GeoNames 4887398

The two middays

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

Midday of Saturday 28 October

Taken. The only midday Navamī reaches.

madhyāhna begins 12:10  12:58 madhyāhna ends
11:2211:4612:1012:3412:5813:2213:46

48 of 48 minutes covered

Midday of Sunday 29 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:10  12:58 madhyāhna ends
11:2211:4612:1012:3412:5813:2213:46

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 06:21 on Sat 28 Oct to 07:51 on Sun 29 Oct.

    2017-10-28T11:21:21Z → 2017-10-29T12:50:55Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:10–12:58 on the 28th, 12:10–12:58 on the 29th.

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

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 48 of 48 minutes on the 28th and 0 of 48 on the 29th.

    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 15547 s

  5. 05

    Ruling

    Durgā Navamī, Chicago, 2017: Saturday 28 October.

    confidence: determinate

Say it like this

In Chicago, Durgā Navamī 2017 falls on Saturday 28 October. Navamī runs from 06:21 on Sat 28 Oct to 07:51 on Sun 29 Oct and covers all of madhyāhna that midday.

ahargana.org/chicago/festivals/2017/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 28 Oct
Ahargaṇa, classicalDisc centre, no refractionSat 28 Oct
compat-drikpanchangComparison profileSat 28 Oct
No institution has a recorded ruling for Chicago.

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 28thCoveredMadhyāhna 29thCoveredRuled
Los Angeles04:21 → 05:5112:1348 min12:120 min28 Oct
Chicago06:21 → 07:5112:1048 min12:100 min28 Oct
Jersey City07:21 → 08:5112:1648 min12:160 min28 Oct
Port of Spain07:21 → 08:5111:2648 min11:260 min28 Oct
London12:21 → 12:5112:2047 min11:2048 min28 Oct
Durban13:21 → 14:5111:160 min11:1648 min29 Oct
Dubai15:21 → 16:5111:380 min11:3848 min29 Oct
Delhi16:51 → 18:2111:410 min11:4148 min29 Oct
Kolkata16:51 → 18:2110:560 min10:5648 min29 Oct
Singapore19:21 → 20:5112:240 min12:2448 min29 Oct
Sydney22:21 → 23:5112:150 min12:1548 min29 Oct
Suva23:21 → 00:5111:260 min11:2648 min29 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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