Ruling · Naraka Caturdaśī (Choti Diwali) · 1925

Friday 16 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 117 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two dawns

One ghaṭī is 24 minutes. Aruṇodaya is 2 muhūrtas before sunrise.

Dawn of Friday 16 October

Taken. The only dawn Caturdaśī reaches.

04:13 aruṇodaya beginssunrise 05:58
03:4904:1304:3705:0105:2505:4906:13

104 of 104 minutes covered

Dawn of Saturday 17 October

Caturdaśī is absent from aruṇodaya. Not taken.

04:14 aruṇodaya beginssunrise 05:59
03:5004:1404:3805:0205:2605:5006:14

0 of 105 minutes covered

Caturdaśī presentAruṇodaya, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Caturdaśī runs from 01:53 on Fri 16 Oct to 02:17 on Sat 17 Oct.

    1925-10-15T17:53:26Z → 1925-10-16T18:17:09Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 04:13–05:58 on the 16th, 04:14–05:59 on the 17th.

    arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Caturdaśī must be present during aruṇodaya. It covers 104 of 104 minutes on the 16th and 0 of 105 on the 17th.

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

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 7036 s

  5. 05

    Ruling

    Naraka Caturdaśī, Daqing, 1925: Friday 16 October.

    confidence: determinate

Say it like this

In Daqing, Naraka Caturdaśī (Choti Diwali) 1925 falls on Friday 16 October. Caturdaśī runs from 01:53 on Fri 16 Oct to 02:17 on Sat 17 Oct and covers all of aruṇodaya that dawn.

ahargana.org/daqing/festivals/1925/naraka-chaturdashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 16 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 16 Oct
compat-drikpanchangComparison profileFri 16 Oct
No institution has a recorded ruling for Daqing.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/naraka-chaturdashi · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Kṛṣṇa · Caturdaśī
Kāla
Aruṇodaya
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“K 14 Naraka caturdasi (covering a period of 4 ghatikas before sunrise, if occurs on two successive days, it is to be observed on the first day)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceCaturdaśīAruṇodaya 15thCoveredAruṇodaya 16thCoveredRuled
Los Angeles09:53 → 10:1704:170 min04:18101 min16 Oct
Chicago11:53 → 12:1704:200 min04:21103 min16 Oct
Jersey City12:53 → 13:1704:250 min04:25103 min16 Oct
Port of Spain13:53 → 14:1704:180 min04:1897 min16 Oct
London17:53 → 18:1704:380 min04:39106 min16 Oct
Durban19:53 → 20:1703:490 min03:4890 min16 Oct
Dubai21:53 → 22:1704:380 min04:3899 min16 Oct
Delhi23:23 → 23:4704:420 min04:42100 min16 Oct
Kolkata23:23 → 23:4703:540 min03:5499 min16 Oct
Singapore00:53 → 01:1704:130 min04:1395 min16 Oct
Sydney03:53 → 04:1703:460 min03:4581 min16 Oct
Suva05:53 → 06:1704:060 min04:050 min17 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
naraka-chaturdashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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