Ruling · Caitrī Pūrṇimā · 2021

Monday 26 April

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 54 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 Monday 26 April

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 12:38  13:26 madhyāhna ends
11:5012:1412:3813:0213:2613:5014:14

48 of 48 minutes covered

Midday of Tuesday 27 April

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 12:38  13:26 madhyāhna ends
11:5012:1412:3813:0213:2613:5014:14

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 11:45 on Mon 26 Apr to 08:02 on Tue 27 Apr.

    2021-04-26T07:14:32Z → 2021-04-27T03:31:33Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:38–13:26 on the 26th, 12:38–13:26 on the 27th.

    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 26th and 0 of 48 on the 27th.

    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: paraviddha → only-day · margin 3231 s

  5. 05

    Ruling

    Caitrī Pūrṇimā, Tehran, 2021: Monday 26 April.

    confidence: determinate

Say it like this

In Tehran, Caitrī Pūrṇimā 2021 falls on Monday 26 April. Pūrṇimā runs from 11:45 on Mon 26 Apr to 08:02 on Tue 27 Apr and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/2021/chaitri-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 26 Apr
Ahargaṇa, classicalDisc centre, no refractionMon 26 Apr
compat-drikpanchangComparison profileMon 26 Apr
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/chaitri-purnima · ruleset 2026.3-draft

Month
Caitra, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 102

“S 15 Caitri purnima (paraviddha), Hanumat jayanti, Oli ending (Jain).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāMadhyāhna 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles00:15 → 20:3212:2748 min12:270 min26 Apr
Chicago02:15 → 22:3212:2548 min12:250 min26 Apr
Jersey City03:15 → 23:3212:3048 min12:300 min26 Apr
Port of Spain03:15 → 23:3211:4048 min11:400 min26 Apr
London08:15 → 04:3212:3548 min12:350 min26 Apr
Durban09:15 → 05:3211:2948 min11:290 min26 Apr
Dubai11:15 → 07:3211:5348 min11:530 min26 Apr
Delhi12:45 → 09:0211:550 min11:550 min27 Apr
Kolkata12:45 → 09:0211:110 min11:100 min27 Apr
Singapore15:15 → 11:3212:380 min12:380 min27 Apr
Sydney17:15 → 13:3211:290 min11:2948 min27 Apr
Suva19:15 → 15:3211:400 min11:4048 min27 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
chaitri-purnima@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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