Ruling · Rādhāṣṭamī · 1920

Monday 20 September

Determinatein Lucknow, under the Rashtriya Panchang method. Clear of every threshold by 528 minutes.

Decide it for

LucknowDelhiKolkataSingaporeSydneyJersey City

26°50′ N 80°55′ E · Asia/Kolkata · GeoNames 1264733

The two middays

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

Midday of Sunday 19 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:36  12:24 madhyāhna ends
10:4811:1211:3612:0012:2412:4813:12

0 of 48 minutes covered

Midday of Monday 20 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:36  12:24 madhyāhna ends
10:4811:1211:3612:0012:2412:4813:12

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 21:12 on Sun 19 Sep to 23:39 on Mon 20 Sep.

    1920-09-19T15:42:06Z → 1920-09-20T18:09:03Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:36–12:24 on the 19th, 11:36–12:24 on the 20th.

    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 19th and 48 of 48 on the 20th.

    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 31685 s

  5. 05

    Ruling

    Rādhāṣṭamī, Lucknow, 1920: Monday 20 September.

    confidence: determinate

Say it like this

In Lucknow, Rādhāṣṭamī 1920 falls on Monday 20 September. Aṣṭamī runs from 21:12 on Sun 19 Sep to 23:39 on Mon 20 Sep and covers all of madhyāhna that midday.

ahargana.org/lucknow/festivals/1920/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 20 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 20 Sep
compat-drikpanchangComparison profileMon 20 Sep
No institution has a recorded ruling for Lucknow.

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 19thCoveredMadhyāhna 20thCoveredRuled
Los Angeles07:42 → 10:0911:2248 min11:220 min19 Sep
Chicago10:42 → 13:0912:2048 min12:2048 min19 Sep
Jersey City11:42 → 14:0912:2648 min12:2548 min19 Sep
Port of Spain11:42 → 14:0911:3642 min11:3548 min20 Sep
London16:42 → 19:0912:300 min12:2948 min20 Sep
Durban17:42 → 20:0911:260 min11:2648 min20 Sep
Dubai19:42 → 22:0911:480 min11:4848 min20 Sep
Delhi21:12 → 23:3911:510 min11:5048 min20 Sep
Kolkata21:12 → 23:3911:060 min11:0648 min20 Sep
Singapore22:42 → 01:0911:350 min11:3448 min20 Sep
Sydney01:42 → 04:0911:250 min11:2548 min20 Sep
Suva03:42 → 06:0911:360 min11:3648 min20 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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