Ruling · Rādhāṣṭamī · 1950

Tuesday 19 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 9 min 20 s.

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 Monday 18 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:34  12:22 madhyāhna ends
10:4611:1011:3411:5812:2212:4613:10

0 of 48 minutes covered

Midday of Tuesday 19 September

Taken. Aṣṭamī reaches neither midday; the rule takes the second day.

madhyāhna begins 11:34  12:22 madhyāhna ends
Aṣṭamī ends 11:24:41
10:4611:1011:3411:5812:2212:4613:10

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 13:28 on Mon 18 Sep to 11:25 on Tue 19 Sep.

    1950-09-18T09:57:48Z → 1950-09-19T07:54:41Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:34–12:22 on the 18th, 11:34–12:22 on the 19th.

    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 18th and 0 of 48 on the 19th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: unstated → second-day · margin 560 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 1950: Tuesday 19 September.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 1950 falls on Tuesday 19 September. Aṣṭamī runs from 13:28 on Mon 18 Sep to 11:25 on Tue 19 Sep, and reaches madhyāhna on neither day.

ahargana.org/tehran/festivals/1950/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 19 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 19 Sep
compat-drikpanchangComparison profileTue 19 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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles02:58 → 00:5512:2348 min12:230 min18 Sep
Chicago04:58 → 02:5512:2048 min12:200 min18 Sep
Jersey City05:58 → 03:5512:2648 min12:260 min18 Sep
Port of Spain05:58 → 03:5511:3648 min11:360 min18 Sep
London10:58 → 08:5512:3048 min12:300 min18 Sep
Durban11:58 → 09:5511:2617 min11:260 min18 Sep
Dubai13:58 → 11:5511:490 min11:496 min19 Sep
Delhi15:28 → 13:2511:510 min11:5148 min19 Sep
Kolkata15:28 → 13:2511:070 min11:0648 min19 Sep
Singapore17:28 → 15:2512:050 min12:0548 min19 Sep
Sydney19:58 → 17:5511:260 min11:2648 min19 Sep
Suva21:58 → 19:5511:370 min11:3748 min19 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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