Ruling · Rukmiṇī Dvādaśī · 1997

Sunday 18 May

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 19 minutes.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

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

Midday of Sunday 18 May

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 12:37  13:25 madhyāhna ends
11:4912:1312:3713:0113:2513:4914:13

48 of 48 minutes covered

Midday of Monday 19 May

Qualifies with 29 of 48 minutes. Not taken.

madhyāhna begins 12:37  13:25 madhyāhna ends
Dvādaśī ends 13:06:26
11:4912:1312:3713:0113:2513:4914:13

29 of 48 minutes covered, the first 29

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 11:38 on Sun 18 May to 13:06 on Mon 19 May.

    1997-05-18T07:07:50Z → 1997-05-19T08:36:26Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 18th, 12:37–13:25 on the 19th.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 18th and 29 of 48 on the 19th.

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

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 1113 s

  5. 05

    Ruling

    Rukmiṇī Dvādaśī, Tehran, 1997: Sunday 18 May.

    confidence: determinate

Say it like this

In Tehran, Rukmiṇī Dvādaśī 1997 falls on Sunday 18 May. Dvādaśī runs from 11:38 on Sun 18 May to 13:06 on Mon 19 May and covers all of madhyāhna that midday. It also reaches the next midday for 29 minutes; by the rule the first midday is taken.

ahargana.org/tehran/festivals/1997/rukmini-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 18 May
Ahargaṇa, classicalDisc centre, no refractionSun 18 May
compat-drikpanchangComparison profileSun 18 May
No institution has a recorded ruling for Tehran.

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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles00:08 → 01:3612:2648 min12:260 min18 May
Chicago02:08 → 03:3612:2348 min12:230 min18 May
Jersey City03:08 → 04:3612:2948 min12:290 min18 May
Port of Spain03:08 → 04:3611:3948 min11:390 min18 May
London08:08 → 09:3612:3348 min12:330 min18 May
Durban09:08 → 10:3611:2848 min11:280 min18 May
Dubai11:08 → 12:3611:5148 min11:5145 min18 May
Delhi12:38 → 14:0611:544 min11:5448 min18 May
Kolkata12:38 → 14:0611:090 min11:0948 min19 May
Singapore15:08 → 16:3612:370 min12:3748 min19 May
Sydney17:08 → 18:3611:270 min11:2748 min19 May
Suva19:08 → 20:3611:390 min11:3948 min19 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

About Ahargaṇa