Ruling · Mahānavamī · 1930

Tuesday 30 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 7 min 20 s.

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 Tuesday 30 September

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 11:06  11:54 madhyāhna ends
Navamī begins 11:46:34
10:1810:4211:0611:3011:5412:1812:42

7 of 48 minutes covered, the last 7

Midday of Wednesday 1 October

Qualifies with 48 of 48 minutes. Not taken.

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

48 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 11:47 on Tue 30 Sep to 13:46 on Wed 1 Oct.

    1930-09-30T03:46:34Z → 1930-10-01T05:46:21Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:06–11:54 on the 30th, 11:06–11:54 on the 1st.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 7 of 48 minutes on the 30th and 48 of 48 on the 1st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 440 s

  5. 05

    Ruling

    Mahānavamī, Daqing, 1930: Tuesday 30 September.

    confidence: determinate

Say it like this

In Daqing, Mahānavamī 1930 falls on Tuesday 30 September. Navamī runs from 11:47 on Tue 30 Sep to 13:46 on Wed 1 Oct and covers 7 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken.

ahargana.org/daqing/festivals/1930/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 30 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 30 Sep
compat-drikpanchangComparison profileTue 30 Sep
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 30thCoveredMadhyāhna 1stCoveredRuled
Los Angeles19:47 → 21:4611:1948 min11:180 min30 Sep
Chicago21:47 → 23:4611:1648 min11:160 min30 Sep
Jersey City22:47 → 00:4611:2248 min11:220 min30 Sep
Port of Spain23:47 → 01:4611:3248 min11:320 min30 Sep
London04:47 → 06:4612:2648 min12:260 min30 Sep
Durban05:47 → 07:4611:2248 min11:220 min30 Sep
Dubai07:47 → 09:4611:4548 min11:450 min30 Sep
Delhi09:17 → 11:1611:4748 min11:470 min30 Sep
Kolkata09:17 → 11:1611:0348 min11:0214 min30 Sep
Singapore10:47 → 12:4611:3148 min11:3148 min30 Sep
Sydney13:47 → 15:4611:220 min11:2148 min1 Oct
Suva15:47 → 17:4611:330 min11:3248 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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