Ruling · Rādhāṣṭamī · 2019

Friday 6 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 377 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 Thursday 5 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:39  13:27 madhyāhna ends
11:5112:1512:3913:0313:2713:5114:15

0 of 48 minutes covered

Midday of Friday 6 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:39  13:27 madhyāhna ends
11:5112:1512:3913:0313:2713:5114:15

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 19:50 on Thu 5 Sep to 19:43 on Fri 6 Sep.

    2019-09-05T15:19:41Z → 2019-09-06T15:13:09Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:39–13:27 on the 5th, 12:39–13:27 on the 6th.

    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 5th and 48 of 48 on the 6th.

    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 22597 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 2019: Friday 6 September.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 2019 falls on Friday 6 September. Aṣṭamī runs from 19:50 on Thu 5 Sep to 19:43 on Fri 6 Sep and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/2019/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 6 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 6 Sep
compat-drikpanchangComparison profileFri 6 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 5thCoveredMadhyāhna 6thCoveredRuled
Los Angeles08:20 → 08:1312:2748 min12:270 min5 Sep
Chicago10:20 → 10:1312:2548 min12:250 min5 Sep
Jersey City11:20 → 11:1312:3148 min12:300 min5 Sep
Port of Spain11:20 → 11:1311:4148 min11:400 min5 Sep
London16:20 → 16:1312:350 min12:3448 min6 Sep
Durban17:20 → 17:1311:310 min11:3148 min6 Sep
Dubai19:20 → 19:1311:530 min11:5348 min6 Sep
Delhi20:50 → 20:4311:560 min11:5548 min6 Sep
Kolkata20:50 → 20:4311:110 min11:1148 min6 Sep
Singapore23:20 → 23:1312:390 min12:3948 min6 Sep
Sydney01:20 → 01:1311:300 min11:3048 min6 Sep
Suva03:20 → 03:1311:410 min11:4148 min6 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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