Ruling · Mahānavamī · 2086

Wednesday 16 October

Boundaryin Chattogram, under the Rashtriya Panchang method. A threshold is only 0 min 34 s away. Say “contested”.

Decide it for

ChattogramDelhiKolkataSingaporeSydneyJersey City

22°20′ N 91°50′ E · Asia/Dhaka · GeoNames 1205733

The two middays

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

Midday of Wednesday 16 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:14  12:02 madhyāhna ends
Navamī begins 12:01:45
10:2610:5011:1411:3812:0212:2612:50

1 of 48 minutes covered, the last 1

Midday of Thursday 17 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:14  12:02 madhyāhna ends
Navamī ends 10:49:47
10:2610:5011:1411:3812:0212:2612:50

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 12:02 on Wed 16 Oct to 10:50 on Thu 17 Oct.

    2086-10-16T06:01:45Z → 2086-10-17T04:49:48Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 16th, 11:14–12:02 on the 17th.

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

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 1 of 48 minutes on the 16th and 0 of 48 on the 17th.

    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 34 s < 300 s

  5. 05

    Ruling

    Mahānavamī, Chattogram, 2086: Wednesday 16 October.

    confidence: boundary (margin)

Say it like this

In Chattogram, Mahānavamī 2086 falls on Wednesday 16 October. Navamī runs from 12:02 on Wed 16 Oct to 10:50 on Thu 17 Oct and covers 1 of 48 minutes of madhyāhna that midday. It is 0 min 34 s from a threshold: treat the date as contested.

ahargana.org/chattogram/festivals/2086/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 16 Oct
Ahargaṇa, classicalDisc centre, no refractionWed 16 Oct
compat-drikpanchangComparison profileWed 16 Oct
No institution has a recorded ruling for Chattogram.

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 16thCoveredMadhyāhna 17thCoveredRuled
Los Angeles23:02 → 21:5012:1448 min12:140 min16 Oct
Chicago01:02 → 23:5012:1248 min12:120 min16 Oct
Jersey City02:02 → 00:5012:1848 min12:180 min16 Oct
Port of Spain02:02 → 00:5011:2848 min11:280 min16 Oct
London07:02 → 05:5012:2248 min12:220 min16 Oct
Durban08:02 → 06:5011:1848 min11:180 min16 Oct
Dubai10:02 → 08:5011:4048 min11:400 min16 Oct
Delhi11:32 → 10:2011:4348 min11:420 min16 Oct
Kolkata11:32 → 10:2010:5814 min10:580 min16 Oct
Singapore14:02 → 12:5012:260 min12:2624 min17 Oct
Sydney17:02 → 15:5012:170 min12:1748 min17 Oct
Suva18:02 → 16:5011:280 min11:2848 min17 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahanavami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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