Ruling · Naraka Caturdaśī (Choti Diwali) · 2066

Monday 18 October

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 286 minutes.

Decide it for

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two dawns

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

Dawn of Sunday 17 October

Caturdaśī is absent from aruṇodaya. Not taken.

04:47 aruṇodaya beginssunrise 06:30
04:2304:4705:1105:3505:5906:2306:47

0 of 103 minutes covered

Dawn of Monday 18 October

Taken. The only dawn Caturdaśī reaches.

04:48 aruṇodaya beginssunrise 06:31
04:2404:4805:1205:3606:0006:2406:48

103 of 103 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 12:17 on Sun 17 Oct to 11:16 on Mon 18 Oct.

    2066-10-17T04:16:41Z → 2066-10-18T03:16:25Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 04:47–06:30 on the 17th, 04:48–06:31 on the 18th.

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

  3. 03

    Rule

    Caturdaśī must be present during aruṇodaya. It covers 0 of 103 minutes on the 17th and 103 of 103 on the 18th.

    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 17137 s

  5. 05

    Ruling

    Naraka Caturdaśī, Baoding, 2066: Monday 18 October.

    confidence: determinate

Say it like this

In Baoding, Naraka Caturdaśī (Choti Diwali) 2066 falls on Monday 18 October. Caturdaśī runs from 12:17 on Sun 17 Oct to 11:16 on Mon 18 Oct and covers all of aruṇodaya that dawn.

ahargana.org/baoding/festivals/2066/naraka-chaturdashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 18 Oct
Ahargaṇa, classicalDisc centre, no refractionMon 18 Oct
compat-drikpanchangComparison profileMon 18 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/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 17thCoveredAruṇodaya 18thCoveredRuled
Los Angeles21:17 → 20:1605:19102 min05:190 min17 Oct
Chicago23:17 → 22:1605:22104 min05:230 min17 Oct
Jersey City00:17 → 23:1605:27104 min05:280 min17 Oct
Port of Spain00:17 → 23:1604:1897 min04:180 min17 Oct
London05:17 → 04:1605:41107 min05:430 min17 Oct
Durban06:17 → 05:1603:470 min03:4689 min18 Oct
Dubai08:17 → 07:1604:390 min04:39100 min18 Oct
Delhi09:47 → 08:4604:430 min04:43101 min18 Oct
Kolkata09:47 → 08:4603:550 min03:5599 min18 Oct
Singapore12:17 → 11:1605:120 min05:1295 min18 Oct
Sydney15:17 → 14:1604:440 min04:4388 min18 Oct
Suva16:17 → 15:1604:040 min04:0492 min18 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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