Ruling · Naraka Caturdaśī (Choti Diwali) · 2017

Wednesday 18 October

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 125 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 Wednesday 18 October

Taken. The only dawn Caturdaśī reaches.

04:47 aruṇodaya beginssunrise 06:31
04:2304:4705:1105:3505:5906:2306:47

103 of 103 minutes covered

Dawn of Thursday 19 October

Caturdaśī is absent from aruṇodaya. Not taken.

04:48 aruṇodaya beginssunrise 06:32
04:2404:4805:1205:3606:0006:2406:48

0 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 02:39 on Wed 18 Oct to 02:43 on Thu 19 Oct.

    2017-10-17T18:38:56Z → 2017-10-18T18:43:18Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 04:47–06:31 on the 18th, 04:48–06:32 on the 19th.

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

  3. 03

    Rule

    Caturdaśī must be present during aruṇodaya. It covers 103 of 103 minutes on the 18th and 0 of 103 on the 19th.

    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 7488 s

  5. 05

    Ruling

    Naraka Caturdaśī, Baoding, 2017: Wednesday 18 October.

    confidence: determinate

Say it like this

In Baoding, Naraka Caturdaśī (Choti Diwali) 2017 falls on Wednesday 18 October. Caturdaśī runs from 02:39 on Wed 18 Oct to 02:43 on Thu 19 Oct and covers all of aruṇodaya that dawn.

ahargana.org/baoding/festivals/2017/naraka-chaturdashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 18 Oct
Ahargaṇa, classicalDisc centre, no refractionWed 18 Oct
compat-drikpanchangComparison profileWed 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 Angeles11:39 → 11:4305:180 min05:19102 min18 Oct
Chicago13:39 → 13:4305:220 min05:23104 min18 Oct
Jersey City14:39 → 14:4305:270 min05:27104 min18 Oct
Port of Spain14:39 → 14:4304:180 min04:1897 min18 Oct
London19:39 → 19:4305:410 min05:42108 min18 Oct
Durban20:39 → 20:4303:470 min03:4689 min18 Oct
Dubai22:39 → 22:4304:390 min04:39100 min18 Oct
Delhi00:09 → 00:1304:430 min04:43101 min18 Oct
Kolkata00:09 → 00:1303:550 min03:5599 min18 Oct
Singapore02:39 → 02:4305:120 min05:1295 min18 Oct
Sydney05:39 → 05:4304:440 min04:4332 min18 Oct
Suva06:39 → 06:4304:040 min04:040 min19 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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