Ruling · Buddha Pūrṇimā (Vaiśākhī Pūrṇimā) · 2011

Tuesday 17 May

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 428 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

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

Midday of Monday 16 May

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:13  12:01 madhyāhna ends
10:2510:4911:1311:3712:0112:2512:49

0 of 48 minutes covered

Midday of Tuesday 17 May

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:13  12:01 madhyāhna ends
10:2510:4911:1311:3712:0112:2512:49

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 22:10 on Mon 16 May to 19:09 on Tue 17 May.

    2011-05-16T14:10:10Z → 2011-05-17T11:08:39Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:13–12:01 on the 16th, 11:13–12:01 on the 17th.

    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 16th and 48 of 48 on the 17th.

    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 25673 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Daqing, 2011: Tuesday 17 May.

    confidence: determinate

Say it like this

In Daqing, Buddha Pūrṇimā (Vesak) 2011 falls on Tuesday 17 May. Pūrṇimā runs from 22:10 on Mon 16 May to 19:09 on Tue 17 May and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2011/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 17 May
Ahargaṇa, classicalDisc centre, no refractionTue 17 May
compat-drikpanchangComparison profileTue 17 May
No institution has a recorded ruling for Daqing.

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 16thCoveredMadhyāhna 17thCoveredRuled
Los Angeles07:10 → 04:0912:2648 min12:260 min16 May
Chicago09:10 → 06:0912:2348 min12:230 min16 May
Jersey City10:10 → 07:0912:2948 min12:290 min16 May
Port of Spain10:10 → 07:0911:3948 min11:390 min16 May
London15:10 → 12:0912:330 min12:330 min17 May
Durban16:10 → 13:0911:280 min11:2848 min17 May
Dubai18:10 → 15:0911:510 min11:5148 min17 May
Delhi19:40 → 16:3911:540 min11:5448 min17 May
Kolkata19:40 → 16:3911:090 min11:0948 min17 May
Singapore22:10 → 19:0912:370 min12:3748 min17 May
Sydney00:10 → 21:0911:270 min11:2748 min17 May
Suva02:10 → 23:0911:390 min11:3948 min17 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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