Ruling · Nāga Caturthī · 1922

Monday 23 October

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 2 min 26 s away. Say “contested”.

Decide it for

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 Monday 23 October

Taken. The only midday Caturthī reaches.

madhyāhna begins 11:38  12:26 madhyāhna ends
Caturthī begins 12:23:58
10:5011:1411:3812:0212:2612:5013:14

2 of 48 minutes covered, the last 2

Midday of Tuesday 24 October

Caturthī is absent from madhyāhna. Not taken.

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 12:24 on Mon 23 Oct to 10:21 on Tue 24 Oct.

    1922-10-23T04:23:59Z → 1922-10-24T02:20:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 23rd, 11:38–12:26 on the 24th.

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

  3. 03

    Rule

    Caturthī must be present during madhyāhna. It covers 2 of 48 minutes on the 23rd and 0 of 48 on the 24th.

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

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: paraviddha → only-day · margin 146 s < 300 s

  5. 05

    Ruling

    Nāga Caturthī, Baoding, 1922: Monday 23 October.

    confidence: boundary (margin)

Say it like this

In Baoding, Nāga Caturthī 1922 falls on Monday 23 October. Caturthī runs from 12:24 on Mon 23 Oct to 10:21 on Tue 24 Oct and covers 2 of 48 minutes of madhyāhna that midday. It is 2 min 26 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1922/naga-chaturthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 23 Oct
Ahargaṇa, classicalDisc centre, no refractionMon 23 Oct
compat-drikpanchangComparison profileMon 23 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 23rdCoveredMadhyāhna 24thCoveredRuled
Los Angeles20:24 → 18:2111:1348 min11:130 min23 Oct
Chicago22:24 → 20:2111:1148 min11:110 min23 Oct
Jersey City23:24 → 21:2111:1648 min11:160 min23 Oct
Port of Spain00:24 → 22:2111:2648 min11:260 min23 Oct
London04:24 → 02:2111:2148 min11:200 min23 Oct
Durban06:24 → 04:2111:1748 min11:160 min23 Oct
Dubai08:24 → 06:2111:3948 min11:390 min23 Oct
Delhi09:54 → 07:5111:4148 min11:410 min23 Oct
Kolkata09:54 → 07:5110:5748 min10:570 min23 Oct
Singapore11:24 → 09:2111:2548 min11:250 min23 Oct
Sydney14:24 → 12:2111:160 min11:1648 min24 Oct
Suva16:24 → 14:2111:270 min11:2748 min24 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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