Ruling · Buddha Pūrṇimā (Vaiśākhī Pūrṇimā) · 2000

Thursday 18 May

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 136 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 Wednesday 17 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 Thursday 18 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 14:17 on Wed 17 May to 15:34 on Thu 18 May.

    2000-05-17T06:16:36Z → 2000-05-18T07:34:26Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:13–12:01 on the 17th, 11:13–12:01 on the 18th.

    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 17th and 48 of 48 on the 18th.

    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 8152 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Daqing, 2000: Thursday 18 May.

    confidence: determinate

Say it like this

In Daqing, Buddha Pūrṇimā (Vesak) 2000 falls on Thursday 18 May. Pūrṇimā runs from 14:17 on Wed 17 May to 15:34 on Thu 18 May and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2000/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 18 May
Ahargaṇa, classicalDisc centre, no refractionThu 18 May
compat-drikpanchangComparison profileThu 18 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 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles23:17 → 00:3412:2648 min12:260 min17 May
Chicago01:17 → 02:3412:2348 min12:230 min17 May
Jersey City02:17 → 03:3412:2948 min12:290 min17 May
Port of Spain02:17 → 03:3411:3948 min11:390 min17 May
London07:17 → 08:3412:3348 min12:330 min17 May
Durban08:17 → 09:3411:2848 min11:280 min17 May
Dubai10:17 → 11:3411:5148 min11:510 min17 May
Delhi11:47 → 13:0411:5448 min11:5448 min17 May
Kolkata11:47 → 13:0411:0910 min11:0948 min18 May
Singapore14:17 → 15:3412:370 min12:3748 min18 May
Sydney16:17 → 17:3411:270 min11:2748 min18 May
Suva18:17 → 19:3411:390 min11:3948 min18 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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