Ruling · Nāga Caturthī · 1923

Monday 12 November

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 0 min 03 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 Sunday 11 November

Caturthī is absent from madhyāhna. Not taken.

madhyāhna begins 11:38  12:26 madhyāhna ends
Caturthī begins 12:25:57
10:5011:1411:3812:0212:2612:5013:14

0 of 48 minutes covered

Midday of Monday 12 November

Taken. Caturthī reaches neither midday; the rule takes the second day.

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

0 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 12:26 on Sun 11 Nov to 09:36 on Mon 12 Nov.

    1923-11-11T04:25:58Z → 1923-11-12T01:35:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 11th, 11:38–12:26 on the 12th.

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

  3. 03

    Rule

    Caturthī must be present during madhyāhna. It covers 0 of 48 minutes on the 11th and 0 of 48 on the 12th.

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

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: paraviddha → second-day · margin 3 s < 300 s

  5. 05

    Ruling

    Nāga Caturthī, Baoding, 1923: Monday 12 November.

    confidence: boundary (margin)

Say it like this

In Baoding, Nāga Caturthī 1923 falls on Monday 12 November. Caturthī runs from 12:26 on Sun 11 Nov to 09:36 on Mon 12 Nov, and reaches madhyāhna on neither day. It is 0 min 03 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1923/naga-chaturthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 12 Nov
Ahargaṇa, classicalDisc centre, no refractionMon 12 Nov
compat-drikpanchangComparison profileSun 11 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 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles20:26 → 17:3611:1348 min11:130 min11 Nov
Chicago22:26 → 19:3611:1048 min11:110 min11 Nov
Jersey City23:26 → 20:3611:1648 min11:160 min11 Nov
Port of Spain00:26 → 21:3611:2648 min11:260 min11 Nov
London04:26 → 01:3611:2048 min11:200 min11 Nov
Durban06:26 → 03:3611:1648 min11:160 min11 Nov
Dubai08:26 → 05:3611:3948 min11:390 min11 Nov
Delhi09:56 → 07:0611:4148 min11:410 min11 Nov
Kolkata09:56 → 07:0610:5648 min10:570 min11 Nov
Singapore11:26 → 08:3611:2547 min11:250 min11 Nov
Sydney14:26 → 11:3611:150 min11:1520 min12 Nov
Suva16:26 → 13:3611:260 min11:2648 min12 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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