Ruling · Śiva Śayanotsava · 2000

Saturday 15 July

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 114 minutes.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

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

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Saturday 15 July

Taken. The only evening Pūrṇimā reaches.

20:20 sunsetpradoṣa ends 21:37
19:5620:2020:4421:0821:3221:5622:20

77 of 77 minutes covered

Evening of Sunday 16 July

Pūrṇimā is absent from pradoṣa. Not taken.

20:20 sunsetpradoṣa ends 21:37
19:5620:2020:4421:0821:3221:5622:20

0 of 78 minutes covered

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 15:52 on Sat 15 Jul to 18:25 on Sun 16 Jul.

    2000-07-15T11:22:05Z → 2000-07-16T13:55:13Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 20:20–21:37 on the 15th, 20:20–21:37 on the 16th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 77 of 77 minutes on the 15th and 0 of 78 on the 16th.

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

  4. 04

    Tie-break

    Only one evening qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 6860 s

  5. 05

    Ruling

    Śiva Śayanotsava, Tehran, 2000: Saturday 15 July.

    confidence: determinate

Say it like this

In Tehran, Śiva Śayanotsava 2000 falls on Saturday 15 July. Pūrṇimā runs from 15:52 on Sat 15 Jul to 18:25 on Sun 16 Jul and covers all of pradoṣa that evening.

ahargana.org/tehran/festivals/2000/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 15 Jul
Ahargaṇa, classicalDisc centre, no refractionSat 15 Jul
compat-drikpanchangComparison profileSat 15 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/shiva-shayanotsava · ruleset 2026.3-draft

Month
Āṣāḍha, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
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.

PlacePūrṇimāSunset 15thCoveredSunset 16thCoveredRuled
Los Angeles04:22 → 06:5520:0479 min20:040 min15 Jul
Chicago06:22 → 08:5520:2373 min20:230 min15 Jul
Jersey City07:22 → 09:5520:2674 min20:250 min15 Jul
Port of Spain07:22 → 09:5518:3291 min18:320 min15 Jul
London12:22 → 14:5521:1163 min21:100 min15 Jul
Durban13:22 → 15:5517:14109 min17:140 min15 Jul
Dubai15:22 → 17:5519:1184 min19:110 min15 Jul
Delhi16:52 → 19:2519:2082 min19:205 min15 Jul
Kolkata16:52 → 19:2518:2485 min18:2462 min15 Jul
Singapore19:22 → 21:5519:1688 min19:1695 min16 Jul
Sydney21:22 → 23:5517:040 min17:05111 min16 Jul
Suva23:22 → 01:5517:460 min17:47103 min16 Jul
Profile · tradition
pac-rp@2026.1 · smarta
Rule
shiva-shayanotsava@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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