Ruling · Rādhāṣṭamī · 1967

Monday 11 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 329 minutes.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

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

Midday of Sunday 10 September

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 11 September

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 19:24 on Sun 10 Sep to 17:54 on Mon 11 Sep.

    1967-09-10T15:54:28Z → 1967-09-11T14:23:46Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 10th, 11:37–12:25 on the 11th.

    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 10th and 48 of 48 on the 11th.

    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 19732 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 1967: Monday 11 September.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 1967 falls on Monday 11 September. Aṣṭamī runs from 19:24 on Sun 10 Sep to 17:54 on Mon 11 Sep and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1967/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 11 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 11 Sep
compat-drikpanchangComparison profileMon 11 Sep
No institution has a recorded ruling for Tehran.

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 10thCoveredMadhyāhna 11thCoveredRuled
Los Angeles08:54 → 07:2412:2648 min12:250 min10 Sep
Chicago10:54 → 09:2412:2348 min12:230 min10 Sep
Jersey City11:54 → 10:2412:2948 min12:290 min10 Sep
Port of Spain11:54 → 10:2411:3933 min11:390 min10 Sep
London16:54 → 15:2412:330 min12:3348 min11 Sep
Durban17:54 → 16:2411:290 min11:2948 min11 Sep
Dubai19:54 → 18:2411:520 min11:5148 min11 Sep
Delhi21:24 → 19:5411:540 min11:5448 min11 Sep
Kolkata21:24 → 19:5411:100 min11:0948 min11 Sep
Singapore23:24 → 21:5412:080 min12:0848 min11 Sep
Sydney01:54 → 00:2411:290 min11:2848 min11 Sep
Suva03:54 → 02:2411:400 min11:3948 min11 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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