Ruling · Rādhāṣṭamī · 1990

Tuesday 28 August

Determinatein Cairo, under the Rashtriya Panchang method. Clear of every threshold by 481 minutes.

Decide it for

CairoDelhiKolkataSingaporeSydneyJersey City

30°04′ N 31°15′ E · Africa/Cairo · GeoNames 360630

The two middays

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

Midday of Monday 27 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:32  13:20 madhyāhna ends
11:4412:0812:3212:5613:2013:4414:08

0 of 48 minutes covered

Midday of Tuesday 28 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:32  13:20 madhyāhna ends
11:4412:0812:3212:5613:2013:4414:08

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 21:22 on Mon 27 Aug to 23:47 on Tue 28 Aug.

    1990-08-27T18:21:51Z → 1990-08-28T20:46:30Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:32–13:20 on the 27th, 12:32–13:20 on the 28th.

    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 27th and 48 of 48 on the 28th.

    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 28888 s

  5. 05

    Ruling

    Rādhāṣṭamī, Cairo, 1990: Tuesday 28 August.

    confidence: determinate

Say it like this

In Cairo, Rādhāṣṭamī 1990 falls on Tuesday 28 August. Aṣṭamī runs from 21:22 on Mon 27 Aug to 23:47 on Tue 28 Aug and covers all of madhyāhna that midday.

ahargana.org/cairo/festivals/1990/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 28 Aug
Ahargaṇa, classicalDisc centre, no refractionTue 28 Aug
compat-drikpanchangComparison profileTue 28 Aug
No institution has a recorded ruling for Cairo.

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 27thCoveredMadhyāhna 28thCoveredRuled
Los Angeles11:22 → 13:4712:3048 min12:3048 min27 Aug
Chicago13:22 → 15:4712:280 min12:2748 min28 Aug
Jersey City14:22 → 16:4712:330 min12:3348 min28 Aug
Port of Spain14:22 → 16:4711:440 min11:4348 min28 Aug
London19:22 → 21:4712:380 min12:3748 min28 Aug
Durban20:22 → 22:4711:340 min11:3348 min28 Aug
Dubai22:22 → 00:4711:560 min11:5648 min28 Aug
Delhi23:52 → 02:1711:590 min11:5848 min28 Aug
Kolkata23:52 → 02:1711:140 min11:1448 min28 Aug
Singapore02:22 → 04:4712:420 min12:4248 min28 Aug
Sydney04:22 → 06:4711:330 min11:3348 min28 Aug
Suva06:22 → 08:4711:440 min11:4448 min28 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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