Ruling · Akhaṇḍa Dvādaśī · 1921

Sunday 11 December

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 56 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 11 December

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:28  12:16 madhyāhna ends
10:4011:0411:2811:5212:1612:4013:04

48 of 48 minutes covered

Midday of Monday 12 December

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:29  12:17 madhyāhna ends
10:4111:0511:2911:5312:1712:4113:05

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 10:32 on Sun 11 Dec to 10:33 on Mon 12 Dec.

    1921-12-11T07:06:54Z → 1921-12-12T07:08:12Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:28–12:16 on the 11th, 11:29–12:17 on the 12th.

    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 11th and 0 of 48 on the 12th.

    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 3340 s

  5. 05

    Ruling

    Akhaṇḍa Dvādaśī, Tehran, 1921: Sunday 11 December.

    confidence: determinate

Say it like this

In Tehran, Akhaṇḍa Dvādaśī 1921 falls on Sunday 11 December. Dvādaśī runs from 10:32 on Sun 11 Dec to 10:33 on Mon 12 Dec and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1921/akhanda-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 11 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 11 Dec
compat-drikpanchangComparison profileSun 11 Dec
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/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 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles23:07 → 23:0811:2248 min11:230 min11 Dec
Chicago01:07 → 01:0811:2048 min11:200 min11 Dec
Jersey City02:07 → 02:0811:2648 min11:260 min11 Dec
Port of Spain03:07 → 03:0811:3548 min11:360 min11 Dec
London07:07 → 07:0811:3048 min11:300 min11 Dec
Durban09:07 → 09:0811:2548 min11:260 min11 Dec
Dubai11:07 → 11:0811:4848 min11:480 min11 Dec
Delhi12:37 → 12:3811:501 min11:5148 min12 Dec
Kolkata12:37 → 12:3811:060 min11:0648 min12 Dec
Singapore14:07 → 14:0811:340 min11:3448 min12 Dec
Sydney17:07 → 17:0811:240 min11:2548 min12 Dec
Suva19:07 → 19:0811:350 min11:3648 min12 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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