Ruling · Durgā Navamī · 2025

Thursday 30 October

Determinatein Kolkata, under the Rashtriya Panchang method. Clear of every threshold by 49 minutes.

Decide it for

DelhiKolkataSingaporeSydneyJersey City

22°34′ N 88°22′ E · Asia/Kolkata · GeoNames 1275004

The two middays

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

Midday of Thursday 30 October

Taken. The only midday Navamī reaches.

madhyāhna begins 10:56  11:44 madhyāhna ends
10:0810:3210:5611:2011:4412:0812:32

48 of 48 minutes covered

Midday of Friday 31 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 10:56  11:44 madhyāhna ends
10:0810:3210:5611:2011:4412:0812:32

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 10:07 on Thu 30 Oct to 10:04 on Fri 31 Oct.

    2025-10-30T04:37:02Z → 2025-10-31T04:34:11Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 10:56–11:44 on the 30th, 10:56–11:44 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 48 of 48 minutes on the 30th and 0 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 2943 s

  5. 05

    Ruling

    Durgā Navamī, Kolkata, 2025: Thursday 30 October.

    confidence: determinate

Say it like this

In Kolkata, Durgā Navamī 2025 falls on Thursday 30 October. Navamī runs from 10:07 on Thu 30 Oct to 10:04 on Fri 31 Oct and covers all of madhyāhna that midday.

ahargana.org/kolkata/festivals/2025/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 30 Oct
Ahargaṇa, classicalDisc centre, no refractionThu 30 Oct
compat-drikpanchangComparison profileThu 30 Oct
No institution has a recorded ruling for Kolkata.

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 Angeles21:37 → 21:3412:1248 min12:120 min30 Oct
Chicago23:37 → 23:3412:1048 min12:100 min30 Oct
Jersey City00:37 → 00:3412:1648 min12:160 min30 Oct
Port of Spain00:37 → 00:3411:2648 min11:260 min30 Oct
London04:37 → 04:3411:2048 min11:200 min30 Oct
Durban06:37 → 06:3411:1648 min11:160 min30 Oct
Dubai08:37 → 08:3411:3848 min11:380 min30 Oct
Delhi10:07 → 10:0411:4148 min11:410 min30 Oct
Kolkata10:07 → 10:0410:5648 min10:560 min30 Oct
Singapore12:37 → 12:3412:2435 min12:2410 min30 Oct
Sydney15:37 → 15:3412:150 min12:1548 min31 Oct
Suva16:37 → 16:3411:260 min11:2648 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