Ruling · Buddha Pūrṇimā · 1908

Friday 15 May

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 21 minutes.

Decide it for

ChattogramDelhiKolkataSingaporeSydneyJersey City

22°20′ N 91°50′ E · Asia/Dhaka · GeoNames 1205733

The two middays

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

Midday of Friday 15 May

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:18  12:06 madhyāhna ends
Pūrṇimā begins 11:38:56
10:3010:5411:1811:4212:0612:3012:54

27 of 48 minutes covered, the last 27

Midday of Saturday 16 May

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:18  12:06 madhyāhna ends
10:3010:5411:1811:4212:0612:3012:54

0 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 11:39 on Fri 15 May to 10:25 on Sat 16 May.

    1908-05-15T05:45:37Z → 1908-05-16T04:32:13Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:18–12:06 on the 15th, 11:18–12:06 on the 16th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 27 of 48 minutes on the 15th and 0 of 48 on the 16th.

    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 1238 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Chattogram, 1908: Friday 15 May.

    confidence: determinate

Say it like this

In Chattogram, Buddha Pūrṇimā 1908 falls on Friday 15 May. Pūrṇimā runs from 11:39 on Fri 15 May to 10:25 on Sat 16 May and covers 27 of 48 minutes of madhyāhna that midday.

ahargana.org/chattogram/festivals/1908/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 15 May
Ahargaṇa, classicalDisc centre, no refractionFri 15 May
compat-drikpanchangComparison profileFri 15 May
No institution has a recorded ruling for Chattogram.

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 15thCoveredMadhyāhna 16thCoveredRuled
Los Angeles21:46 → 20:3211:2548 min11:250 min15 May
Chicago23:46 → 22:3211:2348 min11:230 min15 May
Jersey City00:46 → 23:3211:2948 min11:290 min15 May
Port of Spain01:46 → 00:3211:3848 min11:380 min15 May
London05:46 → 04:3211:3348 min11:330 min15 May
Durban07:46 → 06:3211:2848 min11:280 min15 May
Dubai09:27 → 08:1311:3248 min11:320 min15 May
Delhi11:16 → 10:0211:5348 min11:530 min15 May
Kolkata11:16 → 10:0211:0941 min11:090 min15 May
Singapore12:46 → 11:3211:370 min11:370 min16 May
Sydney15:46 → 14:3211:270 min11:2748 min16 May
Suva17:41 → 16:2711:330 min11:3348 min16 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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