Ruling · Caitrī Pūrṇimā · 1908

Thursday 16 April

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 469 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 Wednesday 15 April

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:36  12:24 madhyāhna ends
10:4811:1211:3612:0012:2412:4813:12

0 of 48 minutes covered

Midday of Thursday 16 April

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:35  12:23 madhyāhna ends
10:4711:1111:3511:5912:2312:4713:11

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 20:12 on Wed 15 Apr to 20:20 on Thu 16 Apr.

    1908-04-15T16:47:22Z → 1908-04-16T16:55:04Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:36–12:24 on the 15th, 11:35–12:23 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 0 of 48 minutes on the 15th and 48 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: paraviddha → only-day · margin 28118 s

  5. 05

    Ruling

    Caitrī Pūrṇimā, Tehran, 1908: Thursday 16 April.

    confidence: determinate

Say it like this

In Tehran, Caitrī Pūrṇimā 1908 falls on Thursday 16 April. Pūrṇimā runs from 20:12 on Wed 15 Apr to 20:20 on Thu 16 Apr and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1908/chaitri-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 16 Apr
Ahargaṇa, classicalDisc centre, no refractionThu 16 Apr
compat-drikpanchangComparison profileThu 16 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 15thCoveredMadhyāhna 16thCoveredRuled
Los Angeles08:47 → 08:5511:2948 min11:290 min15 Apr
Chicago10:47 → 10:5511:2748 min11:270 min15 Apr
Jersey City11:47 → 11:5511:3333 min11:3223 min16 Apr
Port of Spain12:47 → 12:5511:420 min11:4248 min16 Apr
London16:47 → 16:5511:370 min11:3748 min16 Apr
Durban18:47 → 18:5511:320 min11:3248 min16 Apr
Dubai20:28 → 20:3611:360 min11:3648 min16 Apr
Delhi22:17 → 22:2511:570 min11:5748 min16 Apr
Kolkata22:17 → 22:2511:130 min11:1348 min16 Apr
Singapore23:47 → 23:5511:410 min11:4148 min16 Apr
Sydney02:47 → 02:5511:310 min11:3148 min16 Apr
Suva04:42 → 04:5011:370 min11:3748 min16 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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