Ruling · Mahānavamī · 2017

Thursday 28 September

Determinatein Phoenix, under the Rashtriya Panchang method. Clear of every threshold by 34 minutes.

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 Thursday 28 September

Taken. The only midday Navamī reaches.

madhyāhna begins 11:55  12:43 madhyāhna ends
11:0711:3111:5512:1912:4313:0713:31

48 of 48 minutes covered

Midday of Friday 29 September

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:54  12:42 madhyāhna ends
Navamī ends 11:20:08
11:0611:3011:5412:1812:4213:0613:30

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 09:07 on Thu 28 Sep to 11:20 on Fri 29 Sep.

    2017-09-28T16:06:35Z → 2017-09-29T18:20:09Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:55–12:43 on the 28th, 11:54–12:42 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 2042 s

  5. 05

    Ruling

    Mahānavamī, Phoenix, 2017: Thursday 28 September.

    confidence: determinate

Say it like this

In Phoenix, Mahānavamī 2017 falls on Thursday 28 September. Navamī runs from 09:07 on Thu 28 Sep to 11:20 on Fri 29 Sep and covers all of madhyāhna that midday.

ahargana.org/phoenix/festivals/2017/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 28 Sep
Ahargaṇa, classicalDisc centre, no refractionThu 28 Sep
compat-drikpanchangComparison profileThu 28 Sep
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/mahanavami · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Navamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 9 Mahanavami (purvaviddha) (In Bengal it is observed as paraviddha covering one muhurta from sunrise).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104. The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceNavamīMadhyāhna 28thCoveredMadhyāhna 29thCoveredRuled
Los Angeles09:07 → 11:2012:1948 min12:190 min28 Sep
Chicago11:07 → 13:2012:1748 min12:1648 min28 Sep
Jersey City12:07 → 14:2012:2248 min12:2248 min28 Sep
Port of Spain12:07 → 14:2011:3314 min11:3248 min28 Sep
London17:07 → 19:2012:270 min12:2648 min29 Sep
Durban18:07 → 20:2011:230 min11:2248 min29 Sep
Dubai20:07 → 22:2011:450 min11:4548 min29 Sep
Delhi21:37 → 23:5011:480 min11:4748 min29 Sep
Kolkata21:37 → 23:5011:030 min11:0348 min29 Sep
Singapore00:07 → 02:2012:310 min12:3148 min29 Sep
Sydney02:07 → 04:2011:220 min11:2248 min29 Sep
Suva04:07 → 06:2011:330 min11:3348 min29 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahanavami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa