Ruling · Buddha Pūrṇimā · 2021

Wednesday 26 May

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 300 minutes.

Decide it for

ChattogramDelhiKolkataSingaporeSydneyJersey City

22°20′ N 91°50′ E · Asia/Dhaka · GeoNames 1205733

The two middays

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

Midday of Tuesday 25 May

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

0 of 48 minutes covered

Midday of Wednesday 26 May

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 21:00 on Tue 25 May to 17:14 on Wed 26 May.

    2021-05-25T15:00:03Z → 2021-05-26T11:13:53Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:26–12:14 on the 25th, 11:26–12:14 on the 26th.

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

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 0 of 48 minutes on the 25th and 48 of 48 on the 26th.

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

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 18004 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Chattogram, 2021: Wednesday 26 May.

    confidence: determinate

Say it like this

In Chattogram, Buddha Pūrṇimā 2021 falls on Wednesday 26 May. Pūrṇimā runs from 21:00 on Tue 25 May to 17:14 on Wed 26 May and covers all of madhyāhna that midday.

ahargana.org/chattogram/festivals/2021/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 26 May
Ahargaṇa, classicalDisc centre, no refractionWed 26 May
compat-drikpanchangComparison profileWed 26 May
No institution has a recorded ruling for Chattogram.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/buddha-purnima · ruleset 2026.3-draft

Month
Vaiśākha, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 102

“S 15 Sampat gauri vrata (paraviddha), Phuladola (Bengal & Orissa) (paraviddha), Gandhesvari puja (Bengal) (purvaviddha), Buddha purnima, Vaisakhi purnima.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāMadhyāhna 25thCoveredMadhyāhna 26thCoveredRuled
Los Angeles08:00 → 04:1412:2648 min12:260 min25 May
Chicago10:00 → 06:1412:2448 min12:240 min25 May
Jersey City11:00 → 07:1412:3048 min12:300 min25 May
Port of Spain11:00 → 07:1411:3948 min11:390 min25 May
London16:00 → 12:1412:340 min12:340 min26 May
Durban17:00 → 13:1411:290 min11:2948 min26 May
Dubai19:00 → 15:1411:520 min11:5248 min26 May
Delhi20:30 → 16:4411:540 min11:5448 min26 May
Kolkata20:30 → 16:4411:100 min11:1048 min26 May
Singapore23:00 → 19:1412:380 min12:3848 min26 May
Sydney01:00 → 21:1411:280 min11:2848 min26 May
Suva03:00 → 23:1411:390 min11:3948 min26 May
Profile · tradition
pac-rp@2026.1 · smarta
Rule
buddha-purnima@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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