Ruling · Dāmodara Dvādaśī · 2021

Thursday 19 August

Determinatein Riyadh, under the Rashtriya Panchang method. Clear of every threshold by 484 minutes.

Decide it for

RiyadhDelhiKolkataSingaporeSydneyJersey City

24°41′ N 46°43′ E · Asia/Riyadh · GeoNames 108410

The two middays

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

Midday of Wednesday 18 August

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:33  12:21 madhyāhna ends
10:4511:0911:3311:5712:2112:4513:09

0 of 48 minutes covered

Midday of Thursday 19 August

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:33  12:21 madhyāhna ends
10:4511:0911:3311:5712:2112:4513:09

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 22:36 on Wed 18 Aug to 20:25 on Thu 19 Aug.

    2021-08-18T19:36:22Z → 2021-08-19T17:24:32Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:33–12:21 on the 18th, 11:33–12:21 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 0 of 48 minutes on the 18th and 48 of 48 on the 19th.

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

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 29040 s

  5. 05

    Ruling

    Dāmodara Dvādaśī, Riyadh, 2021: Thursday 19 August.

    confidence: determinate

Say it like this

In Riyadh, Dāmodara Dvādaśī 2021 falls on Thursday 19 August. Dvādaśī runs from 22:36 on Wed 18 Aug to 20:25 on Thu 19 Aug and covers all of madhyāhna that midday.

ahargana.org/riyadh/festivals/2021/damodara-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 19 Aug
Ahargaṇa, classicalDisc centre, no refractionThu 19 Aug
compat-drikpanchangComparison profileThu 19 Aug
No institution has a recorded ruling for Riyadh.

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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles12:36 → 10:2512:3244 min12:320 min18 Aug
Chicago14:36 → 12:2512:300 min12:300 min19 Aug
Jersey City15:36 → 13:2512:360 min12:3548 min19 Aug
Port of Spain15:36 → 13:2511:460 min11:4648 min19 Aug
London20:36 → 18:2512:400 min12:4048 min19 Aug
Durban21:36 → 19:2511:360 min11:3648 min19 Aug
Dubai23:36 → 21:2511:580 min11:5848 min19 Aug
Delhi01:06 → 22:5512:010 min12:0048 min19 Aug
Kolkata01:06 → 22:5511:160 min11:1648 min19 Aug
Singapore03:36 → 01:2512:440 min12:4448 min19 Aug
Sydney05:36 → 03:2511:350 min11:3548 min19 Aug
Suva07:36 → 05:2511:460 min11:4648 min19 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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