Ruling · Śiva Śayanotsava · 1981

Thursday 16 July

Determinatein Daegu, under the Rashtriya Panchang method. Clear of every threshold by 362 minutes.

Decide it for

DaeguDelhiKolkataSingaporeSydneyJersey City

35°52′ N 128°36′ E · Asia/Seoul · GeoNames 1835329

The two evenings

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

Evening of Thursday 16 July

Taken. The only evening Pūrṇimā reaches.

19:42 sunsetpradoṣa ends 20:59
19:1819:4220:0620:3020:5421:1821:42

77 of 77 minutes covered

Evening of Friday 17 July

Pūrṇimā is absent from pradoṣa. Not taken.

19:41 sunsetpradoṣa ends 20:59
19:1719:4120:0520:2920:5321:1721:41

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 12:46 on Thu 16 Jul to 13:39 on Fri 17 Jul.

    1981-07-16T03:45:33Z → 1981-07-17T04:38:49Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 19:42–20:59 on the 16th, 19:41–20:59 on the 17th.

    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 16th and 0 of 78 on the 17th.

    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 21733 s

  5. 05

    Ruling

    Śiva Śayanotsava, Daegu, 1981: Thursday 16 July.

    confidence: determinate

Say it like this

In Daegu, Śiva Śayanotsava 1981 falls on Thursday 16 July. Pūrṇimā runs from 12:46 on Thu 16 Jul to 13:39 on Fri 17 Jul and covers all of pradoṣa that evening.

ahargana.org/daegu/festivals/1981/shiva-shayanotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 16 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 16 Jul
compat-drikpanchangComparison profileThu 16 Jul
No institution has a recorded ruling for Daegu.

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 16thCoveredSunset 17thCoveredRuled
Los Angeles20:46 → 21:3920:0479 min20:040 min16 Jul
Chicago22:46 → 23:3920:2373 min20:220 min16 Jul
Jersey City23:46 → 00:3920:2574 min20:250 min16 Jul
Port of Spain23:46 → 00:3918:3291 min18:320 min16 Jul
London04:46 → 05:3921:1063 min21:090 min16 Jul
Durban05:46 → 06:3917:14109 min17:150 min16 Jul
Dubai07:46 → 08:3919:1184 min19:100 min16 Jul
Delhi09:16 → 10:0919:2082 min19:200 min16 Jul
Kolkata09:16 → 10:0918:2485 min18:230 min16 Jul
Singapore11:16 → 12:0918:4695 min18:460 min16 Jul
Sydney13:46 → 14:3917:04111 min17:050 min16 Jul
Suva15:46 → 16:3917:46103 min17:470 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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