Ruling · Akhaṇḍa Dvādaśī · 1999

Monday 20 December

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 4 min 28 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 Sunday 19 December

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:51  12:39 madhyāhna ends
11:0311:2711:5112:1512:3913:0313:27

0 of 48 minutes covered

Midday of Monday 20 December

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:51  12:39 madhyāhna ends
Dvādaśī ends 12:34:54
11:0311:2711:5112:1512:3913:0313:27

44 of 48 minutes covered, the first 44

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 15:37 on Sun 19 Dec to 12:35 on Mon 20 Dec.

    1999-12-19T07:37:00Z → 1999-12-20T04:34:54Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:51–12:39 on the 19th, 11:51–12:39 on the 20th.

    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 19th and 44 of 48 on the 20th.

    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 268 s < 300 s

  5. 05

    Ruling

    Akhaṇḍa Dvādaśī, Baoding, 1999: Monday 20 December.

    confidence: boundary (margin)

Say it like this

In Baoding, Akhaṇḍa Dvādaśī 1999 falls on Monday 20 December. Dvādaśī runs from 15:37 on Sun 19 Dec to 12:35 on Mon 20 Dec and covers 44 of 48 minutes of madhyāhna that midday. It is 4 min 28 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1999/akhanda-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 20 Dec
Ahargaṇa, classicalDisc centre, no refractionMon 20 Dec
compat-drikpanchangComparison profileMon 20 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 19thCoveredMadhyāhna 20thCoveredRuled
Los Angeles23:37 → 20:3511:2648 min11:270 min19 Dec
Chicago01:37 → 22:3511:2448 min11:240 min19 Dec
Jersey City02:37 → 23:3511:2948 min11:300 min19 Dec
Port of Spain03:37 → 00:3511:3948 min11:400 min19 Dec
London07:37 → 04:3511:3348 min11:340 min19 Dec
Durban09:37 → 06:3511:2948 min11:290 min19 Dec
Dubai11:37 → 08:3511:5248 min11:520 min19 Dec
Delhi13:07 → 10:0511:540 min11:540 min20 Dec
Kolkata13:07 → 10:0511:090 min11:100 min20 Dec
Singapore15:37 → 12:3512:370 min12:380 min20 Dec
Sydney18:37 → 15:3512:280 min12:2848 min20 Dec
Suva20:37 → 17:3512:390 min12:3948 min20 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

About Ahargaṇa