Ruling · Rādhāṣṭamī · 1925

Wednesday 26 August

Boundaryin Chicago, under the Rashtriya Panchang method. A threshold is only 3 min 13 s away. Say “contested”.

Decide it for

ChicagoDelhiKolkataSingaporeSydneyJersey City

41°51′ N 87°39′ W · America/Chicago · GeoNames 4887398

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Wednesday 26 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:28  13:16 madhyāhna ends
Aṣṭamī begins 12:24:46
11:4012:0412:2812:5213:1613:4014:04

48 of 48 minutes covered

Midday of Thursday 27 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:28  13:16 madhyāhna ends
11:4012:0412:2812:5213:1613:4014:04

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 12:25 on Wed 26 Aug to 10:59 on Thu 27 Aug.

    1925-08-26T17:24:46Z → 1925-08-27T15:59:17Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:28–13:16 on the 26th, 12:28–13:16 on the 27th.

    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 26th and 0 of 48 on the 27th.

    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 193 s < 300 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chicago, 1925: Wednesday 26 August.

    confidence: boundary (margin)

Say it like this

In Chicago, Rādhāṣṭamī 1925 falls on Wednesday 26 August. Aṣṭamī runs from 12:25 on Wed 26 Aug to 10:59 on Thu 27 Aug and covers all of madhyāhna that midday. It is 3 min 13 s from a threshold: treat the date as contested.

ahargana.org/chicago/festivals/1925/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 26 Aug
Ahargaṇa, classicalDisc centre, no refractionWed 26 Aug
compat-drikpanchangComparison profileWed 26 Aug
No institution has a recorded ruling for Chicago.

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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles09:25 → 07:5911:3048 min11:300 min26 Aug
Chicago12:25 → 10:5912:2848 min12:280 min26 Aug
Jersey City13:25 → 11:5912:340 min12:330 min27 Aug
Port of Spain13:25 → 11:5911:440 min11:4316 min27 Aug
London18:25 → 16:5912:380 min12:3748 min27 Aug
Durban19:25 → 17:5911:340 min11:3448 min27 Aug
Dubai21:25 → 19:5911:560 min11:5648 min27 Aug
Delhi22:55 → 21:2911:590 min11:5848 min27 Aug
Kolkata22:55 → 21:2911:140 min11:1448 min27 Aug
Singapore00:25 → 22:5911:420 min11:4248 min27 Aug
Sydney03:25 → 01:5911:330 min11:3348 min27 Aug
Suva05:25 → 03:5911:440 min11:4448 min27 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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