Ruling · Rādhāṣṭamī · 2017

Tuesday 29 August

Determinatein Perth, under the Rashtriya Panchang method. Clear of every threshold by 391 minutes.

Decide it for

PerthDelhiKolkataSingaporeSydneyJersey City

31°57′ S 115°52′ E · Australia/Perth · GeoNames 2063523

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Tuesday 29 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:54  12:42 madhyāhna ends
11:0611:3011:5412:1812:4213:0613:30

48 of 48 minutes covered

Midday of Wednesday 30 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:53  12:41 madhyāhna ends
11:0511:2911:5312:1712:4113:0513:29

0 of 48 minutes covered

Aṣṭamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 03:07 on Tue 29 Aug to 05:23 on Wed 30 Aug.

    2017-08-28T19:06:45Z → 2017-08-29T21:22:56Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:54–12:42 on the 29th, 11:53–12:41 on the 30th.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 29th and 0 of 48 on the 30th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 23430 s

  5. 05

    Ruling

    Rādhāṣṭamī, Perth, 2017: Tuesday 29 August.

    confidence: determinate

Say it like this

In Perth, Rādhāṣṭamī 2017 falls on Tuesday 29 August. Aṣṭamī runs from 03:07 on Tue 29 Aug to 05:23 on Wed 30 Aug and covers all of madhyāhna that midday.

ahargana.org/perth/festivals/2017/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 29 Aug
Ahargaṇa, classicalDisc centre, no refractionTue 29 Aug
compat-drikpanchangComparison profileTue 29 Aug
No institution has a recorded ruling for Perth.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/radhashtami · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 28thCoveredMadhyāhna 29thCoveredRuled
Los Angeles12:07 → 14:2312:3048 min12:2948 min28 Aug
Chicago14:07 → 16:2312:270 min12:2748 min29 Aug
Jersey City15:07 → 17:2312:330 min12:3348 min29 Aug
Port of Spain15:07 → 17:2311:430 min11:4348 min29 Aug
London20:07 → 22:2312:370 min12:3748 min29 Aug
Durban21:07 → 23:2311:330 min11:3348 min29 Aug
Dubai23:07 → 01:2311:560 min11:5548 min29 Aug
Delhi00:37 → 02:5311:580 min11:5848 min29 Aug
Kolkata00:37 → 02:5311:140 min11:1348 min29 Aug
Singapore03:07 → 05:2312:420 min12:4248 min29 Aug
Sydney05:07 → 07:2311:330 min11:3248 min29 Aug
Suva07:07 → 09:2311:440 min11:4348 min29 Aug
Profile · tradition
pac-rp@2026.1 · smarta
Rule
radhashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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