Ruling · Rādhāṣṭamī · 1979

Thursday 30 August

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 119 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 30 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:41  13:29 madhyāhna ends
11:5312:1712:4113:0513:2913:5314:17

48 of 48 minutes covered

Midday of Friday 31 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:41  13:29 madhyāhna ends
11:5312:1712:4113:0513:2913:5314:17

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 10:42 on Thu 30 Aug to 10:25 on Fri 31 Aug.

    1979-08-30T06:11:46Z → 1979-08-31T05:55:05Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:41–13:29 on the 30th, 12:41–13:29 on the 31st.

    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 30th and 0 of 48 on the 31st.

    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 7144 s

  5. 05

    Ruling

    Rādhāṣṭamī, Tehran, 1979: Thursday 30 August.

    confidence: determinate

Say it like this

In Tehran, Rādhāṣṭamī 1979 falls on Thursday 30 August. Aṣṭamī runs from 10:42 on Thu 30 Aug to 10:25 on Fri 31 Aug and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1979/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 30 Aug
Ahargaṇa, classicalDisc centre, no refractionThu 30 Aug
compat-drikpanchangComparison profileThu 30 Aug
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 30thCoveredMadhyāhna 31stCoveredRuled
Los Angeles23:12 → 22:5512:2948 min12:290 min30 Aug
Chicago01:12 → 00:5512:2748 min12:270 min30 Aug
Jersey City02:12 → 01:5512:3348 min12:320 min30 Aug
Port of Spain02:12 → 01:5511:4348 min11:420 min30 Aug
London07:12 → 06:5512:3748 min12:360 min30 Aug
Durban08:12 → 07:5511:3348 min11:330 min30 Aug
Dubai10:12 → 09:5511:5548 min11:550 min30 Aug
Delhi11:42 → 11:2511:5848 min11:570 min30 Aug
Kolkata11:42 → 11:2511:1319 min11:1312 min30 Aug
Singapore13:42 → 13:2512:110 min12:1148 min31 Aug
Sydney16:12 → 15:5511:320 min11:3248 min31 Aug
Suva18:12 → 17:5511:430 min11:4348 min31 Aug
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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