Ruling · Buddha Pūrṇimā (Vaiśākhī Pūrṇimā) · 2025

Sunday 11 May

Determinatein Chicago, under the Rashtriya Panchang method. Clear of every threshold by 27 minutes.

Decide it for

ChicagoDelhiKolkataSingaporeSydneyJersey City

41°51′ N 87°39′ W · America/Chicago · GeoNames 4887398

The two middays

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

Midday of Sunday 11 May

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 12:23  13:11 madhyāhna ends
11:3511:5912:2312:4713:1113:3513:59

48 of 48 minutes covered

Midday of Monday 12 May

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 12:23  13:11 madhyāhna ends
Pūrṇimā ends 11:55:56
11:3511:5912:2312:4713:1113:3513:59

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 09:32 on Sun 11 May to 11:56 on Mon 12 May.

    2025-05-11T14:32:25Z → 2025-05-12T16:55:56Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:23–13:11 on the 11th, 12:23–13:11 on the 12th.

    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 11th and 0 of 48 on the 12th.

    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 1639 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Chicago, 2025: Sunday 11 May.

    confidence: determinate

Say it like this

In Chicago, Buddha Pūrṇimā (Vesak) 2025 falls on Sunday 11 May. Pūrṇimā runs from 09:32 on Sun 11 May to 11:56 on Mon 12 May and covers all of madhyāhna that midday.

ahargana.org/chicago/festivals/2025/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 11 May
Ahargaṇa, classicalDisc centre, no refractionSun 11 May
compat-drikpanchangComparison profileSun 11 May
No institution has a recorded ruling for Chicago.

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 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles07:32 → 09:5612:2648 min12:260 min11 May
Chicago09:32 → 11:5612:2348 min12:230 min11 May
Jersey City10:32 → 12:5612:2948 min12:2927 min11 May
Port of Spain10:32 → 12:5611:3848 min11:3848 min11 May
London15:32 → 17:5612:330 min12:3348 min12 May
Durban16:32 → 18:5611:280 min11:2848 min12 May
Dubai18:32 → 20:5611:510 min11:5148 min12 May
Delhi20:02 → 22:2611:540 min11:5448 min12 May
Kolkata20:02 → 22:2611:090 min11:0948 min12 May
Singapore22:32 → 00:5612:370 min12:3748 min12 May
Sydney00:32 → 02:5611:270 min11:2748 min12 May
Suva02:32 → 04:5611:390 min11:3948 min12 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