Ruling · Rādhāṣṭamī · 1906

Monday 27 August

Determinatein Riyadh, under the Rashtriya Panchang method. Clear of every threshold by 136 minutes.

Decide it for

RiyadhDelhiKolkataSingaporeSydneyJersey City

24°41′ N 46°43′ E · Asia/Riyadh · GeoNames 108410

The two middays

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

Midday of Sunday 26 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

0 of 48 minutes covered

Midday of Monday 27 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

48 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 16:56 on Sun 26 Aug to 14:40 on Mon 27 Aug.

    1906-08-26T13:50:28Z → 1906-08-27T11:34:15Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 26th, 11:37–12:25 on the 27th.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 0 of 48 minutes on the 26th and 48 of 48 on the 27th.

    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 8139 s

  5. 05

    Ruling

    Rādhāṣṭamī, Riyadh, 1906: Monday 27 August.

    confidence: determinate

Say it like this

In Riyadh, Rādhāṣṭamī 1906 falls on Monday 27 August. Aṣṭamī runs from 16:56 on Sun 26 Aug to 14:40 on Mon 27 Aug and covers all of madhyāhna that midday.

ahargana.org/riyadh/festivals/1906/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 27 Aug
Ahargaṇa, classicalDisc centre, no refractionMon 27 Aug
compat-drikpanchangComparison profileMon 27 Aug
No institution has a recorded ruling for Riyadh.

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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles05:50 → 03:3411:3148 min11:300 min26 Aug
Chicago07:50 → 05:3411:2848 min11:280 min26 Aug
Jersey City08:50 → 06:3411:3448 min11:340 min26 Aug
Port of Spain09:50 → 07:3411:4448 min11:440 min26 Aug
London13:50 → 11:3411:380 min11:380 min27 Aug
Durban15:50 → 13:3411:340 min11:3448 min27 Aug
Dubai17:31 → 15:1511:380 min11:3748 min27 Aug
Delhi19:20 → 17:0411:590 min11:5948 min27 Aug
Kolkata19:20 → 17:0411:140 min11:1448 min27 Aug
Singapore20:50 → 18:3411:430 min11:4248 min27 Aug
Sydney23:50 → 21:3411:330 min11:3348 min27 Aug
Suva01:45 → 23:2911:390 min11:3948 min27 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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