Ruling · Durgā Navamī · 1987

Friday 30 October

Determinatein Luanda, under the Rashtriya Panchang method. Clear of every threshold by 380 minutes.

Decide it for

LuandaDelhiKolkataSingaporeSydneyJersey City

8°50′ S 13°14′ E · Africa/Luanda · GeoNames 2240449

The two middays

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

Midday of Friday 30 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:27  12:15 madhyāhna ends
10:3911:0311:2711:5112:1512:3913:03

48 of 48 minutes covered

Midday of Saturday 31 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:27  12:15 madhyāhna ends
10:3911:0311:2711:5112:1512:3913:03

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 05:06 on Fri 30 Oct to 03:01 on Sat 31 Oct.

    1987-10-30T04:06:26Z → 1987-10-31T02:00:47Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:27–12:15 on the 30th, 11:27–12:15 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 22824 s

  5. 05

    Ruling

    Durgā Navamī, Luanda, 1987: Friday 30 October.

    confidence: determinate

Say it like this

In Luanda, Durgā Navamī 1987 falls on Friday 30 October. Navamī runs from 05:06 on Fri 30 Oct to 03:01 on Sat 31 Oct and covers all of madhyāhna that midday.

ahargana.org/luanda/festivals/1987/durga-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 30 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 30 Oct
compat-drikpanchangComparison profileFri 30 Oct
No institution has a recorded ruling for Luanda.

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 Angeles20:06 → 18:0111:1248 min11:120 min30 Oct
Chicago22:06 → 20:0111:1048 min11:100 min30 Oct
Jersey City23:06 → 21:0111:1648 min11:160 min30 Oct
Port of Spain00:06 → 22:0111:2648 min11:260 min30 Oct
London04:06 → 02:0111:2048 min11:200 min30 Oct
Durban06:06 → 04:0111:1648 min11:160 min30 Oct
Dubai08:06 → 06:0111:3848 min11:380 min30 Oct
Delhi09:36 → 07:3111:4148 min11:410 min30 Oct
Kolkata09:36 → 07:3110:5648 min10:560 min30 Oct
Singapore12:06 → 10:0112:2448 min12:240 min30 Oct
Sydney15:06 → 13:0112:150 min12:1546 min31 Oct
Suva16:06 → 14:0111:260 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

About Ahargaṇa