Ruling · Naraka Caturdaśī (Choti Diwali) · 2031

Friday 14 November

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 4 min 39 s away. Say “contested”.

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 Thursday 13 November

Caturdaśī is absent from aruṇodaya. Not taken.

05:07 aruṇodaya beginssunrise 06:58
04:4305:0705:3105:5506:1906:4307:0707:31

0 of 111 minutes covered

Dawn of Friday 14 November

Taken. The only dawn Caturdaśī reaches.

05:08 aruṇodaya beginssunrise 06:59
Caturdaśī ends 06:54:31
04:4405:0805:3205:5606:2006:4407:0807:32

106 of 111 minutes covered, the first 106

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

How it was decided

  1. 01

    Aṅga

    Caturdaśī runs from 08:07 on Thu 13 Nov to 06:55 on Fri 14 Nov.

    2031-11-13T00:06:45Z → 2031-11-13T22:54:31Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 05:07–06:58 on the 13th, 05:08–06:59 on the 14th.

    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 111 minutes on the 13th and 106 of 111 on the 14th.

    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 279 s < 300 s

  5. 05

    Ruling

    Naraka Caturdaśī, Baoding, 2031: Friday 14 November.

    confidence: boundary (margin)

Say it like this

In Baoding, Naraka Caturdaśī (Choti Diwali) 2031 falls on Friday 14 November. Caturdaśī runs from 08:07 on Thu 13 Nov to 06:55 on Fri 14 Nov and covers 106 of 111 minutes of aruṇodaya that dawn. It is 4 min 39 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2031/naraka-chaturdashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 14 Nov
Ahargaṇa, classicalDisc centre, no refractionFri 14 Nov
compat-drikpanchangComparison profileFri 14 Nov
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 13thCoveredAruṇodaya 14thCoveredRuled
Los Angeles16:07 → 14:5504:36108 min04:360 min13 Nov
Chicago18:07 → 16:5504:45113 min04:460 min13 Nov
Jersey City19:07 → 17:5504:49112 min04:500 min13 Nov
Port of Spain20:07 → 18:5504:2299 min04:220 min13 Nov
London00:07 → 22:5505:15120 min05:160 min13 Nov
Durban02:07 → 00:5503:3084 min03:300 min13 Nov
Dubai04:07 → 02:5504:50104 min04:500 min13 Nov
Delhi05:37 → 04:2504:5665 min04:570 min13 Nov
Kolkata05:37 → 04:2504:0511 min04:0519 min13 Nov
Singapore08:07 → 06:5505:120 min05:1296 min14 Nov
Sydney11:07 → 09:5504:240 min04:2381 min14 Nov
Suva12:07 → 10:5503:540 min03:5489 min14 Nov
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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