Ruling · Rukmiṇī Dvādaśī · 2018

Friday 27 April

Boundaryin Daegu, under the Rashtriya Panchang method. A threshold is only 2 min 22 s away. Say “contested”.

Decide it for

DaeguDelhiKolkataSingaporeSydneyJersey City

35°52′ N 128°36′ E · Asia/Seoul · GeoNames 1835329

The two middays

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

Midday of Thursday 26 April

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 12:00  12:48 madhyāhna ends
Dvādaśī begins 12:50:06
11:1211:3612:0012:2412:4813:1213:36

0 of 48 minutes covered

Midday of Friday 27 April

Taken. Dvādaśī reaches neither midday; the rule takes the second day.

madhyāhna begins 12:00  12:48 madhyāhna ends
Dvādaśī ends 11:37:42
11:1211:3612:0012:2412:4813:1213:36

0 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 12:50 on Thu 26 Apr to 11:38 on Fri 27 Apr.

    2018-04-26T03:50:07Z → 2018-04-27T02:37:42Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:00–12:48 on the 26th, 12:00–12:48 on the 27th.

    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 26th and 0 of 48 on the 27th.

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

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: purvaviddha → second-day · margin 142 s < 300 s

  5. 05

    Ruling

    Rukmiṇī Dvādaśī, Daegu, 2018: Friday 27 April.

    confidence: boundary (margin)

Say it like this

In Daegu, Rukmiṇī Dvādaśī 2018 falls on Friday 27 April. Dvādaśī runs from 12:50 on Thu 26 Apr to 11:38 on Fri 27 Apr, and reaches madhyāhna on neither day. It is 2 min 22 s from a threshold: treat the date as contested.

ahargana.org/daegu/festivals/2018/rukmini-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 27 Apr
Ahargaṇa, classicalDisc centre, no refractionFri 27 Apr
compat-drikpanchangComparison profileThu 26 Apr
No institution has a recorded ruling for Daegu.

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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles20:50 → 19:3812:2748 min12:270 min26 Apr
Chicago22:50 → 21:3812:2548 min12:250 min26 Apr
Jersey City23:50 → 22:3812:3048 min12:300 min26 Apr
Port of Spain23:50 → 22:3811:4048 min11:400 min26 Apr
London04:50 → 03:3812:3548 min12:350 min26 Apr
Durban05:50 → 04:3811:3048 min11:290 min26 Apr
Dubai07:50 → 06:3811:5348 min11:530 min26 Apr
Delhi09:20 → 08:0811:5548 min11:550 min26 Apr
Kolkata09:20 → 08:0811:1148 min11:100 min26 Apr
Singapore11:50 → 10:3812:3848 min12:380 min26 Apr
Sydney13:50 → 12:3811:290 min11:2948 min27 Apr
Suva15:50 → 14:3811:400 min11:4048 min27 Apr
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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