Ruling · Rādhāṣṭamī · 2092

Tuesday 9 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 28 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 Monday 8 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:38  12:26 madhyāhna ends
Aṣṭamī begins 12:54:12
10:5011:1411:3812:0212:2612:5013:14

0 of 48 minutes covered

Midday of Tuesday 9 September

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

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

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 12:54 on Mon 8 Sep to 10:41 on Tue 9 Sep.

    2092-09-08T09:24:13Z → 2092-09-09T07:11:06Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 8th, 11:37–12:25 on the 9th.

    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 8th and 0 of 48 on the 9th.

    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 1706 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 2092: Tuesday 9 September.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 2092 falls on Tuesday 9 September. Aṣṭamī runs from 12:54 on Mon 8 Sep to 10:41 on Tue 9 Sep, and reaches madhyāhna on neither day.

ahargana.org/tehran/festivals/2092/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 9 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 9 Sep
compat-drikpanchangComparison profileMon 8 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 8thCoveredMadhyāhna 9thCoveredRuled
Los Angeles02:24 → 00:1112:2648 min12:260 min8 Sep
Chicago04:24 → 02:1112:2448 min12:240 min8 Sep
Jersey City05:24 → 03:1112:3048 min12:290 min8 Sep
Port of Spain05:24 → 03:1111:4048 min11:390 min8 Sep
London10:24 → 08:1112:3448 min12:330 min8 Sep
Durban11:24 → 09:1111:3048 min11:290 min8 Sep
Dubai13:24 → 11:1111:520 min11:520 min9 Sep
Delhi14:54 → 12:4111:550 min11:5447 min9 Sep
Kolkata14:54 → 12:4111:100 min11:1048 min9 Sep
Singapore17:24 → 15:1112:380 min12:3848 min9 Sep
Sydney19:24 → 17:1111:290 min11:2948 min9 Sep
Suva21:24 → 19:1111:400 min11:4048 min9 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

About Ahargaṇa