Ruling · Guru Pūrṇimā · 2002

Wednesday 24 July

Boundaryin Tehran, under the Rashtriya Panchang method. A threshold is only 2 min 25 s away. Say “contested”.

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 Tuesday 23 July

Qualifies with 7 of 48 minutes. Not taken.

madhyāhna begins 12:47  13:35 madhyāhna ends
Pūrṇimā begins 13:27:55
11:5912:2312:4713:1113:3513:5914:23

7 of 48 minutes covered, the last 7

Midday of Wednesday 24 July

Taken. Both middays qualify; the rule takes the second.

madhyāhna begins 12:47  13:35 madhyāhna ends
Pūrṇimā ends 13:37:00
11:5912:2312:4713:1113:3513:5914:23

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 13:28 on Tue 23 Jul to 13:37 on Wed 24 Jul.

    2002-07-23T08:57:56Z → 2002-07-24T09:07:00Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:47–13:35 on the 23rd, 12:47–13:35 on the 24th.

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

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 7 of 48 minutes on the 23rd and 48 of 48 on the 24th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 145 s < 300 s

  5. 05

    Ruling

    Guru Pūrṇimā, Tehran, 2002: Wednesday 24 July.

    confidence: boundary (margin)

Say it like this

In Tehran, Guru Pūrṇimā 2002 falls on Wednesday 24 July. Pūrṇimā runs from 13:28 on Tue 23 Jul to 13:37 on Wed 24 Jul and covers all of madhyāhna that midday. It also reaches the previous midday for 7 minutes; by the rule the second midday is taken. It is 2 min 25 s from a threshold: treat the date as contested.

ahargana.org/tehran/festivals/2002/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 24 Jul
Ahargaṇa, classicalDisc centre, no refractionWed 24 Jul
compat-drikpanchangComparison profileWed 24 Jul
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/guru-purnima · ruleset 2026.3-draft

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

“S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāMadhyāhna 23rdCoveredMadhyāhna 24thCoveredRuled
Los Angeles01:58 → 02:0712:3548 min12:350 min23 Jul
Chicago03:58 → 04:0712:3348 min12:330 min23 Jul
Jersey City04:58 → 05:0712:3948 min12:390 min23 Jul
Port of Spain04:58 → 05:0711:4948 min11:490 min23 Jul
London09:58 → 10:0712:4348 min12:430 min23 Jul
Durban10:58 → 11:0711:3848 min11:380 min23 Jul
Dubai12:58 → 13:0712:010 min12:0148 min24 Jul
Delhi14:28 → 14:3712:030 min12:0348 min24 Jul
Kolkata14:28 → 14:3711:190 min11:1948 min24 Jul
Singapore16:58 → 17:0712:470 min12:4748 min24 Jul
Sydney18:58 → 19:0711:380 min11:3848 min24 Jul
Suva20:58 → 21:0711:490 min11:4948 min24 Jul
Profile · tradition
pac-rp@2026.1 · smarta
Rule
guru-purnima@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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