Ruling · Buddha Pūrṇimā · 2071

Wednesday 13 May

Boundaryin Daqing, under the Rashtriya Panchang method. Both middays qualify and the rule does not say which to take. Say “contested”.

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 13 May

Taken. Both middays qualify; the rule is silent, and this one is covered longer.

madhyāhna begins 11:13  12:01 madhyāhna ends
Pūrṇimā begins 10:37:35
10:2510:4911:1311:3712:0112:2512:49

48 of 48 minutes covered

Midday of Thursday 14 May

Qualifies with 12 of 48 minutes. Not taken.

madhyāhna begins 11:13  12:01 madhyāhna ends
Pūrṇimā ends 11:25:09
10:2510:4911:1311:3712:0112:2512:49

12 of 48 minutes covered, the first 12

Pūrṇimā presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 10:38 on Wed 13 May to 11:25 on Thu 14 May.

    2071-05-13T02:37:35Z → 2071-05-14T03:25:10Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:13–12:01 on the 13th, 11:13–12:01 on the 14th.

    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 13th and 12 of 48 on the 14th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 732 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Daqing, 2071: Wednesday 13 May.

    confidence: boundary (tie-break-unstated)

Say it like this

In Daqing, Buddha Pūrṇimā 2071 falls on Wednesday 13 May. Pūrṇimā runs from 10:38 on Wed 13 May to 11:25 on Thu 14 May and covers all of madhyāhna that midday. It also reaches the next midday for 12 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/daqing/festivals/2071/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 13 May
Ahargaṇa, classicalDisc centre, no refractionWed 13 May
compat-drikpanchangComparison profileWed 13 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 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles19:38 → 20:2512:2648 min12:260 min13 May
Chicago21:38 → 22:2512:2348 min12:230 min13 May
Jersey City22:38 → 23:2512:2948 min12:290 min13 May
Port of Spain22:38 → 23:2511:3948 min11:390 min13 May
London03:38 → 04:2512:3448 min12:340 min13 May
Durban04:38 → 05:2511:2848 min11:280 min13 May
Dubai06:38 → 07:2511:5148 min11:510 min13 May
Delhi08:08 → 08:5511:5448 min11:540 min13 May
Kolkata08:08 → 08:5511:0948 min11:090 min13 May
Singapore10:38 → 11:2512:3748 min12:370 min13 May
Sydney12:38 → 13:2511:280 min11:2848 min14 May
Suva14:38 → 15:2511:390 min11:3948 min14 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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