Ruling · Rādhāṣṭamī · 1919

Tuesday 2 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 276 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 Tuesday 2 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:35  12:23 madhyāhna ends
10:4711:1111:3511:5912:2312:4713:11

48 of 48 minutes covered

Midday of Wednesday 3 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:35  12:23 madhyāhna ends
10:4711:1111:3511:5912:2312:4713:11

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 04:30 on Tue 2 Sep to 06:59 on Wed 3 Sep.

    1919-09-02T01:05:23Z → 1919-09-03T03:33:55Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:35–12:23 on the 2nd, 11:35–12:23 on the 3rd.

    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 2nd and 0 of 48 on the 3rd.

    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 16545 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 1919: Tuesday 2 September.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 1919 falls on Tuesday 2 September. Aṣṭamī runs from 04:30 on Tue 2 Sep to 06:59 on Wed 3 Sep and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1919/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 2 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 2 Sep
compat-drikpanchangComparison profileTue 2 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 2ndCoveredMadhyāhna 3rdCoveredRuled
Los Angeles18:05 → 20:3412:2948 min12:280 min2 Sep
Chicago20:05 → 22:3412:2648 min12:260 min2 Sep
Jersey City21:05 → 23:3412:3248 min12:310 min2 Sep
Port of Spain21:05 → 23:3411:4248 min11:420 min2 Sep
London02:05 → 04:3412:3648 min12:360 min2 Sep
Durban03:05 → 05:3411:3248 min11:320 min2 Sep
Dubai04:46 → 07:1511:3648 min11:350 min2 Sep
Delhi06:35 → 09:0411:5748 min11:570 min2 Sep
Kolkata06:35 → 09:0411:1248 min11:120 min2 Sep
Singapore08:05 → 10:3411:4148 min11:400 min2 Sep
Sydney11:05 → 13:3411:3148 min11:3148 min2 Sep
Suva13:05 → 15:3411:420 min11:4248 min3 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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