Ruling · Rukmiṇī Dvādaśī · 1908

Wednesday 13 May

Determinatein Datong, under the Rashtriya Panchang method. Clear of every threshold by 70 minutes.

Decide it for

DatongDelhiKolkataSingaporeSydneyJersey City

40°06′ N 113°17′ E · Asia/Shanghai · GeoNames 2037799

The two middays

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

Midday of Tuesday 12 May

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:59  12:47 madhyāhna ends
11:1111:3511:5912:2312:4713:1113:35

0 of 48 minutes covered

Midday of Wednesday 13 May

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:59  12:47 madhyāhna ends
11:1111:3511:5912:2312:4713:1113:35

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 13:57 on Tue 12 May to 14:32 on Wed 13 May.

    1908-05-12T05:56:51Z → 1908-05-13T06:31:54Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:59–12:47 on the 12th, 11:59–12:47 on the 13th.

    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 12th and 48 of 48 on the 13th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: purvaviddha → only-day · margin 4170 s

  5. 05

    Ruling

    Rukmiṇī Dvādaśī, Datong, 1908: Wednesday 13 May.

    confidence: determinate

Say it like this

In Datong, Rukmiṇī Dvādaśī 1908 falls on Wednesday 13 May. Dvādaśī runs from 13:57 on Tue 12 May to 14:32 on Wed 13 May and covers all of madhyāhna that midday.

ahargana.org/datong/festivals/1908/rukmini-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 13 May
Ahargaṇa, classicalDisc centre, no refractionWed 13 May
compat-drikpanchangComparison profileWed 13 May
No institution has a recorded ruling for Datong.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/rukmini-dvadashi · ruleset 2026.3-draft

Month
Vaiśākha, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 102

“S 12 Parasurama dvadasi (purvaviddha), Rukmini dvadasi (purvaviddha)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles21:57 → 22:3211:2548 min11:250 min12 May
Chicago23:57 → 00:3211:2348 min11:230 min12 May
Jersey City00:57 → 01:3211:2948 min11:290 min12 May
Port of Spain01:57 → 02:3211:3848 min11:380 min12 May
London05:57 → 06:3211:3348 min11:330 min12 May
Durban07:57 → 08:3211:2848 min11:280 min12 May
Dubai09:38 → 10:1311:3248 min11:320 min12 May
Delhi11:27 → 12:0211:5348 min11:538 min12 May
Kolkata11:27 → 12:0211:0930 min11:0948 min12 May
Singapore12:57 → 13:3211:370 min11:3748 min13 May
Sydney15:57 → 16:3211:270 min11:2748 min13 May
Suva17:52 → 18:2711:330 min11:3348 min13 May
Profile · tradition
pac-rp@2026.1 · smarta
Rule
rukmini-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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