Ruling · Mahānavamī · 1997

Friday 10 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 195 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

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

Midday of Friday 10 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:03  11:51 madhyāhna ends
10:1510:3911:0311:2711:5112:1512:39

48 of 48 minutes covered

Midday of Saturday 11 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:02  11:50 madhyāhna ends
10:1410:3811:0211:2611:5012:1412:38

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 07:47 on Fri 10 Oct to 06:11 on Sat 11 Oct.

    1997-10-09T23:47:20Z → 1997-10-10T22:10:46Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:03–11:51 on the 10th, 11:02–11:50 on the 11th.

    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 10th and 0 of 48 on the 11th.

    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 11721 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 1997: Friday 10 October.

    confidence: determinate

Say it like this

In Daqing, Mahānavamī 1997 falls on Friday 10 October. Navamī runs from 07:47 on Fri 10 Oct to 06:11 on Sat 11 Oct and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1997/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 10 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 10 Oct
compat-drikpanchangComparison profileFri 10 Oct
No institution has a recorded ruling for Daqing.

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 9thCoveredMadhyāhna 10thCoveredRuled
Los Angeles16:47 → 15:1112:160 min12:1648 min10 Oct
Chicago18:47 → 17:1112:130 min12:1348 min10 Oct
Jersey City19:47 → 18:1112:190 min12:1948 min10 Oct
Port of Spain19:47 → 18:1111:290 min11:2948 min10 Oct
London00:47 → 23:1112:230 min12:2348 min10 Oct
Durban01:47 → 00:1111:190 min11:1948 min10 Oct
Dubai03:47 → 02:1111:420 min11:4248 min10 Oct
Delhi05:17 → 03:4111:440 min11:4448 min10 Oct
Kolkata05:17 → 03:4111:000 min10:5948 min10 Oct
Singapore07:47 → 06:1112:280 min12:2848 min10 Oct
Sydney09:47 → 08:1111:190 min11:1948 min10 Oct
Suva11:47 → 10:1111:300 min11:3030 min10 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

About Ahargaṇa