Ruling · Mahānavamī · 1911

Sunday 1 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 32 minutes.

Decide it for

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 Sunday 1 October

Taken. The only midday Navamī reaches.

madhyāhna begins 11:06  11:54 madhyāhna ends
10:1810:4211:0611:3011:5412:1812:42

48 of 48 minutes covered

Midday of Monday 2 October

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:05  11:53 madhyāhna ends
Navamī ends 10:33:14
10:1710:4111:0511:2911:5312:1712:41

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 08:20 on Sun 1 Oct to 10:33 on Mon 2 Oct.

    1911-10-01T00:20:07Z → 1911-10-02T02:33:15Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:06–11:54 on the 1st, 11:05–11:53 on the 2nd.

    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 1st and 0 of 48 on the 2nd.

    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 1928 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 1911: Sunday 1 October.

    confidence: determinate

Say it like this

In Daqing, Mahānavamī 1911 falls on Sunday 1 October. Navamī runs from 08:20 on Sun 1 Oct to 10:33 on Mon 2 Oct and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1911/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 1 Oct
Ahargaṇa, classicalDisc centre, no refractionSun 1 Oct
compat-drikpanchangComparison profileSun 1 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 1stCoveredMadhyāhna 2ndCoveredRuled
Los Angeles16:20 → 18:3311:1948 min11:180 min1 Oct
Chicago18:20 → 20:3311:1648 min11:160 min1 Oct
Jersey City19:20 → 21:3311:2248 min11:220 min1 Oct
Port of Spain20:20 → 22:3311:3248 min11:320 min1 Oct
London00:20 → 02:3311:2648 min11:260 min1 Oct
Durban02:20 → 04:3311:2248 min11:220 min1 Oct
Dubai04:01 → 06:1411:2648 min11:250 min1 Oct
Delhi05:50 → 08:0311:4748 min11:470 min1 Oct
Kolkata05:50 → 08:0311:0248 min11:020 min1 Oct
Singapore07:20 → 09:3311:3148 min11:300 min1 Oct
Sydney10:20 → 12:3311:2248 min11:2148 min1 Oct
Suva12:15 → 14:2811:280 min11:2748 min1 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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