Ruling · Mahānavamī · 1903

Tuesday 29 September

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 1 min 13 s away. Say “contested”.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

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

Midday of Tuesday 29 September

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

madhyāhna begins 11:45  12:33 madhyāhna ends
10:5711:2111:4512:0912:3312:5713:21

48 of 48 minutes covered

Midday of Wednesday 30 September

Qualifies with 47 of 48 minutes. Not taken.

madhyāhna begins 11:44  12:32 madhyāhna ends
Navamī ends 12:31:04
10:5611:2011:4412:0812:3212:5613:20

47 of 48 minutes covered, the first 47

Navamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Navamī runs from 10:11 on Tue 29 Sep to 12:31 on Wed 30 Sep.

    1903-09-29T02:11:16Z → 1903-09-30T04:31:04Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 29th, 11:44–12:32 on the 30th.

    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 29th and 47 of 48 on the 30th.

    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 73 s < 300 s

  5. 05

    Ruling

    Mahānavamī, Baoding, 1903: Tuesday 29 September.

    confidence: boundary (margin)

Say it like this

In Baoding, Mahānavamī 1903 falls on Tuesday 29 September. Navamī runs from 10:11 on Tue 29 Sep to 12:31 on Wed 30 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 47 minutes; by the rule the first midday is taken. It is 1 min 13 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1903/mahanavami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 29 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 29 Sep
compat-drikpanchangComparison profileTue 29 Sep
No institution has a recorded ruling for Baoding.

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 29thCoveredMadhyāhna 30thCoveredRuled
Los Angeles18:11 → 20:3111:1948 min11:190 min29 Sep
Chicago20:11 → 22:3111:1748 min11:170 min29 Sep
Jersey City21:11 → 23:3111:2348 min11:220 min29 Sep
Port of Spain22:11 → 00:3111:3348 min11:320 min29 Sep
London02:11 → 04:3111:2748 min11:260 min29 Sep
Durban04:11 → 06:3111:2348 min11:220 min29 Sep
Dubai05:52 → 08:1211:2648 min11:260 min29 Sep
Delhi07:32 → 09:5211:3948 min11:380 min29 Sep
Kolkata07:32 → 09:5210:5448 min10:540 min29 Sep
Singapore09:06 → 11:2611:2648 min11:260 min29 Sep
Sydney12:11 → 14:3111:220 min11:2248 min30 Sep
Suva14:06 → 16:2611:280 min11:2848 min30 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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