Ruling · Rādhāṣṭamī · 1913

Sunday 7 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 404 minutes.

Decide it for

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 7 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:33  12:21 madhyāhna ends
10:4511:0911:3311:5712:2112:4513:09

48 of 48 minutes covered

Midday of Monday 8 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:33  12:21 madhyāhna ends
10:4511:0911:3311:5712:2112:4513:09

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 04:49 on Sun 7 Sep to 04:22 on Mon 8 Sep.

    1913-09-07T01:24:29Z → 1913-09-08T00:56:46Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:33–12:21 on the 7th, 11:33–12:21 on the 8th.

    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 7th and 0 of 48 on the 8th.

    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 24222 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 1913: Sunday 7 September.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 1913 falls on Sunday 7 September. Aṣṭamī runs from 04:49 on Sun 7 Sep to 04:22 on Mon 8 Sep and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1913/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 7 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 7 Sep
compat-drikpanchangComparison profileSun 7 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 7thCoveredMadhyāhna 8thCoveredRuled
Los Angeles17:24 → 16:5711:2748 min11:260 min7 Sep
Chicago19:24 → 18:5711:2448 min11:240 min7 Sep
Jersey City20:24 → 19:5711:3048 min11:300 min7 Sep
Port of Spain21:24 → 20:5711:4048 min11:400 min7 Sep
London01:24 → 00:5711:3448 min11:340 min7 Sep
Durban03:24 → 02:5711:3048 min11:300 min7 Sep
Dubai05:05 → 04:3811:3448 min11:330 min7 Sep
Delhi06:54 → 06:2711:5548 min11:550 min7 Sep
Kolkata06:54 → 06:2711:1148 min11:100 min7 Sep
Singapore08:24 → 07:5711:3948 min11:380 min7 Sep
Sydney11:24 → 10:5711:3048 min11:290 min7 Sep
Suva13:19 → 12:5211:360 min11:3548 min8 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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