Ruling · Mahānavamī · 1925

Saturday 26 September

Determinatein Cairo, under the Rashtriya Panchang method. Clear of every threshold by 630 minutes.

Decide it for

CairoDelhiKolkataSingaporeSydneyJersey City

30°04′ N 31°15′ E · Africa/Cairo · GeoNames 360630

The two middays

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

Midday of Saturday 26 September

Taken. The only midday Navamī reaches.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

48 of 48 minutes covered

Midday of Sunday 27 September

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

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 00:53 on Sat 26 Sep to 22:44 on Sat 26 Sep.

    1925-09-25T22:52:42Z → 1925-09-26T20:44:25Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 26th, 11:22–12:10 on the 27th.

    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 26th and 0 of 48 on the 27th.

    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 37773 s

  5. 05

    Ruling

    Mahānavamī, Cairo, 1925: Saturday 26 September.

    confidence: determinate

Say it like this

In Cairo, Mahānavamī 1925 falls on Saturday 26 September. Navamī runs from 00:53 on Sat 26 Sep to 22:44 on Sat 26 Sep and covers all of madhyāhna that midday.

ahargana.org/cairo/festivals/1925/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 26 Sep
Ahargaṇa, classicalDisc centre, no refractionSat 26 Sep
compat-drikpanchangComparison profileSat 26 Sep
No institution has a recorded ruling for Cairo.

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 25thCoveredMadhyāhna 26thCoveredRuled
Los Angeles14:53 → 12:4411:200 min11:2048 min26 Sep
Chicago17:53 → 15:4412:180 min12:1848 min26 Sep
Jersey City18:53 → 16:4412:240 min12:2348 min26 Sep
Port of Spain18:53 → 16:4411:340 min11:3348 min26 Sep
London23:53 → 21:4412:280 min12:2748 min26 Sep
Durban00:53 → 22:4411:240 min11:2448 min26 Sep
Dubai02:53 → 00:4411:460 min11:4648 min26 Sep
Delhi04:23 → 02:1411:490 min11:4848 min26 Sep
Kolkata04:23 → 02:1411:040 min11:0448 min26 Sep
Singapore05:53 → 03:4411:320 min11:3248 min26 Sep
Sydney08:53 → 06:4411:230 min11:2348 min26 Sep
Suva10:53 → 08:4411:340 min11:3448 min26 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

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