Ruling · Nāga Caturthī · 2025

Saturday 25 October

Determinatein Ujjain, under the Rashtriya Panchang method. Clear of every threshold by 478 minutes.

Decide it for

UjjainDelhiKolkataSingaporeSydneyJersey City

23°11′ N 75°47′ E · Asia/Kolkata · GeoNames 1253914

The two middays

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

Midday of Saturday 25 October

Taken. The only midday Caturthī reaches.

madhyāhna begins 11:47  12:35 madhyāhna ends
10:5911:2311:4712:1112:3512:5913:23

48 of 48 minutes covered

Midday of Sunday 26 October

Caturthī is absent from madhyāhna. Not taken.

madhyāhna begins 11:47  12:35 madhyāhna ends
10:5911:2311:4712:1112:3512:5913:23

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 01:20 on Sat 25 Oct to 03:49 on Sun 26 Oct.

    2025-10-24T19:50:01Z → 2025-10-25T22:18:49Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:47–12:35 on the 25th, 11:47–12:35 on the 26th.

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

  3. 03

    Rule

    Caturthī must be present during madhyāhna. It covers 48 of 48 minutes on the 25th and 0 of 48 on the 26th.

    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 28674 s

  5. 05

    Ruling

    Nāga Caturthī, Ujjain, 2025: Saturday 25 October.

    confidence: determinate

Say it like this

In Ujjain, Nāga Caturthī 2025 falls on Saturday 25 October. Caturthī runs from 01:20 on Sat 25 Oct to 03:49 on Sun 26 Oct and covers all of madhyāhna that midday.

ahargana.org/ujjain/festivals/2025/naga-chaturthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 25 Oct
Ahargaṇa, classicalDisc centre, no refractionSat 25 Oct
compat-drikpanchangComparison profileSat 25 Oct
No institution has a recorded ruling for Ujjain.

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 24thCoveredMadhyāhna 25thCoveredRuled
Los Angeles12:50 → 15:1912:1311 min12:1348 min25 Oct
Chicago14:50 → 17:1912:100 min12:1048 min25 Oct
Jersey City15:50 → 18:1912:160 min12:1648 min25 Oct
Port of Spain15:50 → 18:1911:260 min11:2648 min25 Oct
London20:50 → 23:1912:200 min12:2048 min25 Oct
Durban21:50 → 00:1911:160 min11:1648 min25 Oct
Dubai23:50 → 02:1911:390 min11:3948 min25 Oct
Delhi01:20 → 03:4911:410 min11:4148 min25 Oct
Kolkata01:20 → 03:4910:570 min10:5648 min25 Oct
Singapore03:50 → 06:1912:250 min12:2548 min25 Oct
Sydney06:50 → 09:1912:160 min12:1648 min25 Oct
Suva07:50 → 10:1911:270 min11:2748 min25 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