Ruling · Dāmodara Dvādaśī · 1921

Sunday 14 August

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 7 min 50 s.

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 14 August

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

madhyāhna begins 11:40  12:28 madhyāhna ends
10:5211:1611:4012:0412:2812:5213:16

48 of 48 minutes covered

Midday of Monday 15 August

Qualifies with 8 of 48 minutes. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
Dvādaśī ends 11:48:03
10:5111:1511:3912:0312:2712:5113:15

8 of 48 minutes covered, the first 8

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 09:41 on Sun 14 Aug to 11:47 on Mon 15 Aug.

    1921-08-14T06:16:06Z → 1921-08-15T08:22:20Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:40–12:28 on the 14th, 11:39–12:27 on the 15th.

    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 14th and 8 of 48 on the 15th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 470 s

  5. 05

    Ruling

    Dāmodara Dvādaśī, Tehran, 1921: Sunday 14 August.

    confidence: determinate

Say it like this

In Tehran, Dāmodara Dvādaśī 1921 falls on Sunday 14 August. Dvādaśī runs from 09:41 on Sun 14 Aug to 11:47 on Mon 15 Aug and covers all of madhyāhna that midday. It also reaches the next midday for 8 minutes; by the rule the first midday is taken.

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

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 14 Aug
Ahargaṇa, classicalDisc centre, no refractionSun 14 Aug
compat-drikpanchangComparison profileSun 14 Aug
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/damodara-dvadashi · ruleset 2026.3-draft

Month
Śrāvaṇa, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 103

“S 12 Buddha dvadasi, Damodara dvadasi (purvaviddha), Visnu-pavitraropana.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 14thCoveredMadhyāhna 15thCoveredRuled
Los Angeles22:16 → 00:2211:3348 min11:330 min14 Aug
Chicago01:16 → 03:2212:3148 min12:310 min14 Aug
Jersey City02:16 → 04:2212:3748 min12:360 min14 Aug
Port of Spain02:16 → 04:2211:4748 min11:460 min14 Aug
London07:16 → 09:2212:4148 min12:400 min14 Aug
Durban08:16 → 10:2211:3748 min11:360 min14 Aug
Dubai10:16 → 12:2211:5948 min11:5923 min14 Aug
Delhi11:46 → 13:5212:0248 min12:0148 min14 Aug
Kolkata11:46 → 13:5211:1719 min11:1748 min14 Aug
Singapore13:16 → 15:2211:450 min11:4548 min15 Aug
Sydney16:16 → 18:2211:360 min11:3648 min15 Aug
Suva18:16 → 20:2211:470 min11:4748 min15 Aug
Profile · tradition
pac-rp@2026.1 · smarta
Rule
damodara-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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