Ruling · Nāga Caturthī · 2001

Monday 19 November

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 15 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 Sunday 18 November

Qualifies with 18 of 48 minutes. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
Caturthī begins 12:09:05
10:5111:1511:3912:0312:2712:5113:15

18 of 48 minutes covered, the last 18

Midday of Monday 19 November

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

madhyāhna begins 11:39  12:27 madhyāhna ends
Caturthī ends 12:42:03
10:5111:1511:3912:0312:2712:5113:15

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 Sun 18 Nov to 12:42 on Mon 19 Nov.

    2001-11-18T04:09:05Z → 2001-11-19T04:42:03Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 18th, 11:39–12:27 on the 19th.

    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 18th and 48 of 48 on the 19th.

    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 884 s

  5. 05

    Ruling

    Nāga Caturthī, Baoding, 2001: Monday 19 November.

    confidence: determinate

Say it like this

In Baoding, Nāga Caturthī 2001 falls on Monday 19 November. Caturthī runs from 12:09 on Sun 18 Nov to 12:42 on Mon 19 Nov 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/2001/naga-chaturthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 19 Nov
Ahargaṇa, classicalDisc centre, no refractionMon 19 Nov
compat-drikpanchangComparison profileMon 19 Nov
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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles20:09 → 20:4211:1448 min11:140 min18 Nov
Chicago22:09 → 22:4211:1248 min11:120 min18 Nov
Jersey City23:09 → 23:4211:1748 min11:180 min18 Nov
Port of Spain00:09 → 00:4211:2748 min11:270 min18 Nov
London04:09 → 04:4211:2148 min11:220 min18 Nov
Durban06:09 → 06:4211:1748 min11:170 min18 Nov
Dubai08:09 → 08:4211:4048 min11:400 min18 Nov
Delhi09:39 → 10:1211:4248 min11:420 min18 Nov
Kolkata09:39 → 10:1210:5848 min10:580 min18 Nov
Singapore12:09 → 12:4212:2648 min12:2616 min19 Nov
Sydney15:09 → 15:4212:170 min12:1748 min19 Nov
Suva16:09 → 16:4211:270 min11:2848 min19 Nov
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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