Ruling · Rādhāṣṭamī · 2020

Tuesday 25 August

Determinatein Cairo, under the Rashtriya Panchang method. Clear of every threshold by 161 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 Tuesday 25 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:33  12:21 madhyāhna ends
10:4511:0911:3311:5712:2112:4513:09

48 of 48 minutes covered

Midday of Wednesday 26 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:32  12:20 madhyāhna ends
10:4411:0811:3211:5612:2012:4413:08

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 08:52 on Tue 25 Aug to 07:10 on Wed 26 Aug.

    2020-08-25T06:52:16Z → 2020-08-26T05:09:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:33–12:21 on the 25th, 11:32–12:20 on the 26th.

    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 25th and 0 of 48 on the 26th.

    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 9630 s

  5. 05

    Ruling

    Rādhāṣṭamī, Cairo, 2020: Tuesday 25 August.

    confidence: determinate

Say it like this

In Cairo, Rādhāṣṭamī 2020 falls on Tuesday 25 August. Aṣṭamī runs from 08:52 on Tue 25 Aug to 07:10 on Wed 26 Aug and covers all of madhyāhna that midday.

ahargana.org/cairo/festivals/2020/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 25 Aug
Ahargaṇa, classicalDisc centre, no refractionTue 25 Aug
compat-drikpanchangComparison profileTue 25 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 25thCoveredMadhyāhna 26thCoveredRuled
Los Angeles23:52 → 22:1012:3148 min12:300 min25 Aug
Chicago01:52 → 00:1012:2848 min12:280 min25 Aug
Jersey City02:52 → 01:1012:3448 min12:340 min25 Aug
Port of Spain02:52 → 01:1011:4448 min11:440 min25 Aug
London07:52 → 06:1012:3848 min12:380 min25 Aug
Durban08:52 → 07:1011:3448 min11:340 min25 Aug
Dubai10:52 → 09:1011:5748 min11:560 min25 Aug
Delhi12:22 → 10:4011:5925 min11:590 min25 Aug
Kolkata12:22 → 10:4011:140 min11:140 min26 Aug
Singapore14:52 → 13:1012:430 min12:4228 min26 Aug
Sydney16:52 → 15:1011:330 min11:3348 min26 Aug
Suva18:52 → 17:1011:450 min11:4448 min26 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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