Ruling · Buddha Pūrṇimā · 1921

Saturday 21 May

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 664 minutes.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

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

Midday of Friday 20 May

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:32  12:20 madhyāhna ends
10:4411:0811:3211:5612:2012:4413:08

0 of 48 minutes covered

Midday of Saturday 21 May

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:32  12:20 madhyāhna ends
10:4411:0811:3211:5612:2012:4413:08

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 23:24 on Fri 20 May to 23:40 on Sat 21 May.

    1921-05-20T19:58:59Z → 1921-05-21T20:15:03Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:32–12:20 on the 20th, 11:32–12:20 on the 21st.

    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 20th and 48 of 48 on the 21st.

    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 39848 s

  5. 05

    Ruling

    Buddha Pūrṇimā, Tehran, 1921: Saturday 21 May.

    confidence: determinate

Say it like this

In Tehran, Buddha Pūrṇimā 1921 falls on Saturday 21 May. Pūrṇimā runs from 23:24 on Fri 20 May to 23:40 on Sat 21 May and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1921/buddha-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 21 May
Ahargaṇa, classicalDisc centre, no refractionSat 21 May
compat-drikpanchangComparison profileSat 21 May
No institution has a recorded ruling for Tehran.

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 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles11:59 → 12:1511:2615 min11:2648 min21 May
Chicago14:59 → 15:1512:230 min12:2348 min21 May
Jersey City15:59 → 16:1512:290 min12:2948 min21 May
Port of Spain15:59 → 16:1511:380 min11:3948 min21 May
London20:59 → 21:1512:330 min12:3348 min21 May
Durban21:59 → 22:1511:280 min11:2848 min21 May
Dubai23:59 → 00:1511:510 min11:5148 min21 May
Delhi01:29 → 01:4511:540 min11:5448 min21 May
Kolkata01:29 → 01:4511:090 min11:0948 min21 May
Singapore02:59 → 03:1511:370 min11:3748 min21 May
Sydney05:59 → 06:1511:270 min11:2748 min21 May
Suva07:59 → 08:1511:390 min11:3948 min21 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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