Ruling · Buddha Pūrṇimā (Vaiśākhī Pūrṇimā) · 2028

Monday 8 May

Determinatein Ujjain, under the Rashtriya Panchang method. Clear of every threshold by 506 minutes.

Decide it for

UjjainDelhiKolkataSingaporeSydneyJersey City

23°11′ N 75°47′ E · Asia/Kolkata · GeoNames 1253914

The two middays

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

Midday of Monday 8 May

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 12:00  12:48 madhyāhna ends
11:1211:3612:0012:2412:4813:1213:36

48 of 48 minutes covered

Midday of Tuesday 9 May

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:59  12:47 madhyāhna ends
11:1111:3511:5912:2312:4713:1113:35

0 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 03:33 on Mon 8 May to 01:19 on Tue 9 May.

    2028-05-07T22:03:06Z → 2028-05-08T19:48:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:00–12:48 on the 8th, 11:59–12:47 on the 9th.

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

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 8th and 0 of 48 on the 9th.

    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 30385 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Ujjain, 2028: Monday 8 May.

    confidence: determinate

Say it like this

In Ujjain, Buddha Pūrṇimā (Vesak) 2028 falls on Monday 8 May. Pūrṇimā runs from 03:33 on Mon 8 May to 01:19 on Tue 9 May and covers all of madhyāhna that midday.

ahargana.org/ujjain/festivals/2028/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 8 May
Ahargaṇa, classicalDisc centre, no refractionMon 8 May
compat-drikpanchangComparison profileMon 8 May
No institution has a recorded ruling for Ujjain.

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 7thCoveredMadhyāhna 8thCoveredRuled
Los Angeles15:03 → 12:4912:260 min12:2623 min8 May
Chicago17:03 → 14:4912:230 min12:2348 min8 May
Jersey City18:03 → 15:4912:290 min12:2948 min8 May
Port of Spain18:03 → 15:4911:390 min11:3948 min8 May
London23:03 → 20:4912:340 min12:3348 min8 May
Durban00:03 → 21:4911:280 min11:2848 min8 May
Dubai02:03 → 23:4911:510 min11:5148 min8 May
Delhi03:33 → 01:1911:540 min11:5448 min8 May
Kolkata03:33 → 01:1911:090 min11:0948 min8 May
Singapore06:03 → 03:4912:370 min12:3748 min8 May
Sydney08:03 → 05:4911:280 min11:2748 min8 May
Suva10:03 → 07:4911:390 min11:3948 min8 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