Ruling · Akhaṇḍa Dvādaśī · 1909

Friday 24 December

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 1 min 40 s away. Say “contested”.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

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

The two middays

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

Midday of Thursday 23 December

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:53  12:41 madhyāhna ends
11:0511:2911:5312:1712:4113:0513:29

0 of 48 minutes covered

Midday of Friday 24 December

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:54  12:42 madhyāhna ends
Dvādaśī ends 11:55:11
11:0611:3011:5412:1812:4213:0613:30

2 of 48 minutes covered, the first 2

Dvādaśī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 14:21 on Thu 23 Dec to 11:55 on Fri 24 Dec.

    1909-12-23T06:21:15Z → 1909-12-24T03:55:11Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:53–12:41 on the 23rd, 11:54–12:42 on the 24th.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 23rd and 2 of 48 on the 24th.

    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 100 s < 300 s

  5. 05

    Ruling

    Akhaṇḍa Dvādaśī, Baoding, 1909: Friday 24 December.

    confidence: boundary (margin)

Say it like this

In Baoding, Akhaṇḍa Dvādaśī 1909 falls on Friday 24 December. Dvādaśī runs from 14:21 on Thu 23 Dec to 11:55 on Fri 24 Dec and covers 2 of 48 minutes of madhyāhna that midday. It is 1 min 40 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1909/akhanda-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 24 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 24 Dec
compat-drikpanchangComparison profileFri 24 Dec
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/akhanda-dvadashi · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 12 Matsya dvadasi, Akhanda dvadasi (paraviddha), Vyanjana dvadasi & Dana dvadasi (Orissa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 23rdCoveredMadhyāhna 24thCoveredRuled
Los Angeles22:21 → 19:5511:2848 min11:290 min23 Dec
Chicago00:21 → 21:5511:2648 min11:260 min23 Dec
Jersey City01:21 → 22:5511:3148 min11:320 min23 Dec
Port of Spain02:21 → 23:5511:4148 min11:420 min23 Dec
London06:21 → 03:5511:3648 min11:360 min23 Dec
Durban08:21 → 05:5511:3148 min11:310 min23 Dec
Dubai10:02 → 07:3611:3548 min11:350 min23 Dec
Delhi11:51 → 09:2511:5648 min11:560 min23 Dec
Kolkata11:51 → 09:2511:118 min11:120 min23 Dec
Singapore13:21 → 10:5511:390 min11:400 min24 Dec
Sydney16:21 → 13:5511:300 min11:3048 min24 Dec
Suva18:16 → 15:5011:360 min11:3748 min24 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
akhanda-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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