Ruling · Nāga Caturthī · 2009

Thursday 22 October

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 18 minutes.

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 Wednesday 21 October

Qualifies with 18 of 48 minutes. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
Caturthī begins 12:08:37
10:5111:1511:3912:0312:2712:5113:15

18 of 48 minutes covered, the last 18

Midday of Thursday 22 October

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

madhyāhna begins 11:38  12:26 madhyāhna ends
Caturthī ends 13:02:56
10:5011:1411:3812:0212:2612:5013:14

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Caturthī runs from 12:09 on Wed 21 Oct to 13:03 on Thu 22 Oct.

    2009-10-21T04:08:38Z → 2009-10-22T05:02:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 21st, 11:38–12:26 on the 22nd.

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

  3. 03

    Rule

    Caturthī must be present during madhyāhna. It covers 18 of 48 minutes on the 21st and 48 of 48 on the 22nd.

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

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 1075 s

  5. 05

    Ruling

    Nāga Caturthī, Baoding, 2009: Thursday 22 October.

    confidence: determinate

Say it like this

In Baoding, Nāga Caturthī 2009 falls on Thursday 22 October. Caturthī runs from 12:09 on Wed 21 Oct to 13:03 on Thu 22 Oct and covers all of madhyāhna that midday. It also reaches the previous midday for 18 minutes; by the rule the second midday is taken.

ahargana.org/baoding/festivals/2009/naga-chaturthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 22 Oct
Ahargaṇa, classicalDisc centre, no refractionThu 22 Oct
compat-drikpanchangComparison profileThu 22 Oct
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/naga-chaturthi · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Caturthī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 4 Naga caturthi (paraviddha and madhyahnavyapini).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceCaturthīMadhyāhna 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles21:09 → 22:0312:1348 min12:130 min21 Oct
Chicago23:09 → 00:0312:1148 min12:110 min21 Oct
Jersey City00:09 → 01:0312:1748 min12:160 min21 Oct
Port of Spain00:09 → 01:0311:2748 min11:260 min21 Oct
London05:09 → 06:0312:2148 min12:210 min21 Oct
Durban06:09 → 07:0311:1748 min11:170 min21 Oct
Dubai08:09 → 09:0311:3948 min11:390 min21 Oct
Delhi09:39 → 10:3311:4248 min11:410 min21 Oct
Kolkata09:39 → 10:3310:5748 min10:570 min21 Oct
Singapore12:09 → 13:0312:2548 min12:2538 min22 Oct
Sydney15:09 → 16:0312:160 min12:1648 min22 Oct
Suva16:09 → 17:0311:270 min11:2748 min22 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
naga-chaturthi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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