Ruling · Dāmodara Dvādaśī · 2018

Wednesday 22 August

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 1 min 06 s away. Say “contested”.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

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

Midday of Wednesday 22 August

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

madhyāhna begins 11:57  12:45 madhyāhna ends
11:0911:3311:5712:2112:4513:0913:33

48 of 48 minutes covered

Midday of Thursday 23 August

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:57  12:45 madhyāhna ends
Dvādaśī ends 12:45:38
11:0911:3311:5712:2112:4513:0913:33

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 10:11 on Wed 22 Aug to 12:46 on Thu 23 Aug.

    2018-08-22T02:10:43Z → 2018-08-23T04:45:39Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:57–12:45 on the 22nd, 11:57–12:45 on the 23rd.

    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 22nd and 48 of 48 on the 23rd.

    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 66 s < 300 s

  5. 05

    Ruling

    Dāmodara Dvādaśī, Baoding, 2018: Wednesday 22 August.

    confidence: boundary (margin)

Say it like this

In Baoding, Dāmodara Dvādaśī 2018 falls on Wednesday 22 August. Dvādaśī runs from 10:11 on Wed 22 Aug to 12:46 on Thu 23 Aug and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken. It is 1 min 06 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2018/damodara-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 22 Aug
Ahargaṇa, classicalDisc centre, no refractionWed 22 Aug
compat-drikpanchangComparison profileWed 22 Aug
No institution has a recorded ruling for Baoding.

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 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles19:11 → 21:4612:3248 min12:310 min22 Aug
Chicago21:11 → 23:4612:2948 min12:290 min22 Aug
Jersey City22:11 → 00:4612:3548 min12:350 min22 Aug
Port of Spain22:11 → 00:4611:4548 min11:450 min22 Aug
London03:11 → 05:4612:3948 min12:390 min22 Aug
Durban04:11 → 06:4611:3548 min11:350 min22 Aug
Dubai06:11 → 08:4611:5848 min11:570 min22 Aug
Delhi07:41 → 10:1612:0048 min12:000 min22 Aug
Kolkata07:41 → 10:1611:1548 min11:150 min22 Aug
Singapore10:11 → 12:4612:4448 min12:432 min22 Aug
Sydney12:11 → 14:4611:3412 min11:3448 min22 Aug
Suva14:11 → 16:4611:450 min11:4548 min23 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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