Ruling · Rādhāṣṭamī · 1947

Monday 22 September

Determinatein Riyadh, under the Rashtriya Panchang method. Clear of every threshold by 447 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 21 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

0 of 48 minutes covered

Midday of Monday 22 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

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 19:38 on Sun 21 Sep to 21:52 on Mon 22 Sep.

    1947-09-21T16:37:37Z → 1947-09-22T18:51:40Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 21st, 11:22–12:10 on the 22nd.

    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 21st and 48 of 48 on the 22nd.

    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 26839 s

  5. 05

    Ruling

    Rādhāṣṭamī, Riyadh, 1947: Monday 22 September.

    confidence: determinate

Say it like this

In Riyadh, Rādhāṣṭamī 1947 falls on Monday 22 September. Aṣṭamī runs from 19:38 on Sun 21 Sep to 21:52 on Mon 22 Sep and covers all of madhyāhna that midday.

ahargana.org/riyadh/festivals/1947/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 22 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 22 Sep
compat-drikpanchangComparison profileMon 22 Sep
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 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles08:38 → 10:5211:2248 min11:220 min21 Sep
Chicago11:38 → 13:5212:1948 min12:1948 min21 Sep
Jersey City12:38 → 14:5212:2536 min12:2548 min22 Sep
Port of Spain12:38 → 14:5211:350 min11:3548 min22 Sep
London17:38 → 19:5212:290 min12:2948 min22 Sep
Durban18:38 → 20:5211:250 min11:2548 min22 Sep
Dubai20:38 → 22:5211:480 min11:4848 min22 Sep
Delhi22:08 → 00:2211:500 min11:5048 min22 Sep
Kolkata22:08 → 00:2211:060 min11:0548 min22 Sep
Singapore00:08 → 02:2212:040 min12:0448 min22 Sep
Sydney02:38 → 04:5211:250 min11:2548 min22 Sep
Suva04:38 → 06:5211:360 min11:3648 min22 Sep
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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