Ruling · Buddha Pūrṇimā (Vaiśākhī Pūrṇimā) · 1973

Wednesday 16 May

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

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

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

Midday of Wednesday 16 May

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

madhyāhna begins 11:51  12:39 madhyāhna ends
11:0311:2711:5112:1512:3913:0313:27

48 of 48 minutes covered

Midday of Thursday 17 May

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:51  12:39 madhyāhna ends
Pūrṇimā ends 12:58:02
11:0311:2711:5112:1512:3913:0313:27

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 10:58 on Wed 16 May to 12:58 on Thu 17 May.

    1973-05-16T02:57:47Z → 1973-05-17T04:58:02Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:51–12:39 on the 16th, 11:51–12:39 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 48 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

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

    priority: unstated → greater-coverage · margin 1159 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Baoding, 1973: Wednesday 16 May.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Buddha Pūrṇimā (Vesak) 1973 falls on Wednesday 16 May. Pūrṇimā runs from 10:58 on Wed 16 May to 12:58 on Thu 17 May and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/baoding/festivals/1973/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 16 May
Ahargaṇa, classicalDisc centre, no refractionWed 16 May
compat-drikpanchangComparison profileWed 16 May
No institution has a recorded ruling for Baoding.

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 Angeles19:58 → 21:5812:2548 min12:260 min16 May
Chicago21:58 → 23:5812:2348 min12:230 min16 May
Jersey City22:58 → 00:5812:2948 min12:290 min16 May
Port of Spain22:58 → 00:5811:3848 min11:380 min16 May
London03:58 → 05:5812:3348 min12:330 min16 May
Durban04:58 → 06:5811:2848 min11:280 min16 May
Dubai06:58 → 08:5811:5148 min11:510 min16 May
Delhi08:28 → 10:2811:5448 min11:540 min16 May
Kolkata08:28 → 10:2811:0948 min11:090 min16 May
Singapore10:28 → 12:2812:0748 min12:0721 min16 May
Sydney12:58 → 14:5811:270 min11:2748 min17 May
Suva14:58 → 16:5811:390 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

About Ahargaṇa