Ruling · Buddha Pūrṇimā · 1997

Thursday 22 May

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 312 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 21 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 22 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 17:39 on Wed 21 May to 17:13 on Thu 22 May.

    1997-05-21T09:38:31Z → 1997-05-22T09:13:24Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:13–12:01 on the 21st, 11:13–12:01 on the 22nd.

    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 21st and 48 of 48 on the 22nd.

    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 18747 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Daqing, 1997: Thursday 22 May.

    confidence: determinate

Say it like this

In Daqing, Buddha Pūrṇimā 1997 falls on Thursday 22 May. Pūrṇimā runs from 17:39 on Wed 21 May to 17:13 on Thu 22 May and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1997/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 22 May
Ahargaṇa, classicalDisc centre, no refractionThu 22 May
compat-drikpanchangComparison profileThu 22 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 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles02:39 → 02:1312:2648 min12:260 min21 May
Chicago04:39 → 04:1312:2348 min12:240 min21 May
Jersey City05:39 → 05:1312:2948 min12:290 min21 May
Port of Spain05:39 → 05:1311:3948 min11:390 min21 May
London10:39 → 10:1312:3448 min12:340 min21 May
Durban11:39 → 11:1311:2838 min11:280 min21 May
Dubai13:39 → 13:1311:510 min11:5248 min22 May
Delhi15:09 → 14:4311:540 min11:5448 min22 May
Kolkata15:09 → 14:4311:090 min11:0948 min22 May
Singapore17:39 → 17:1312:370 min12:3748 min22 May
Sydney19:39 → 19:1311:280 min11:2848 min22 May
Suva21:39 → 21:1311:390 min11:3948 min22 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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