Ruling · Rādhāṣṭamī · 1978

Sunday 10 September

Determinatein Cairo, under the Rashtriya Panchang method. Clear of every threshold by 245 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 Saturday 9 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:28  13:16 madhyāhna ends
11:4012:0412:2812:5213:1613:4014:04

0 of 48 minutes covered

Midday of Sunday 10 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:28  13:16 madhyāhna ends
11:4012:0412:2812:5213:1613:4014:04

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 19:13 on Sat 9 Sep to 17:21 on Sun 10 Sep.

    1978-09-09T16:12:43Z → 1978-09-10T14:21:13Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 9th, 12:28–13:16 on the 10th.

    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 9th and 48 of 48 on the 10th.

    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 14720 s

  5. 05

    Ruling

    Rādhāṣṭamī, Cairo, 1978: Sunday 10 September.

    confidence: determinate

Say it like this

In Cairo, Rādhāṣṭamī 1978 falls on Sunday 10 September. Aṣṭamī runs from 19:13 on Sat 9 Sep to 17:21 on Sun 10 Sep and covers all of madhyāhna that midday.

ahargana.org/cairo/festivals/1978/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 10 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 10 Sep
compat-drikpanchangComparison profileSun 10 Sep
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 9thCoveredMadhyāhna 10thCoveredRuled
Los Angeles09:13 → 07:2112:2648 min12:260 min9 Sep
Chicago11:13 → 09:2112:2448 min12:230 min9 Sep
Jersey City12:13 → 10:2112:2948 min12:290 min9 Sep
Port of Spain12:13 → 10:2111:3915 min11:390 min9 Sep
London17:13 → 15:2112:330 min12:3348 min10 Sep
Durban18:13 → 16:2111:300 min11:2948 min10 Sep
Dubai20:13 → 18:2111:520 min11:5248 min10 Sep
Delhi21:43 → 19:5111:540 min11:5448 min10 Sep
Kolkata21:43 → 19:5111:100 min11:1048 min10 Sep
Singapore23:43 → 21:5112:080 min12:0848 min10 Sep
Sydney02:13 → 00:2111:290 min11:2948 min10 Sep
Suva04:13 → 02:2111:400 min11:4048 min10 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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