Ruling · Rādhāṣṭamī · 1909

Wednesday 22 September

Determinatein Phoenix, under the Rashtriya Panchang method. Clear of every threshold by 627 minutes.

Decide it for

PhoenixDelhiKolkataSingaporeSydneyJersey City

33°27′ N 112°04′ W · America/Phoenix · GeoNames 5308655

The two middays

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

Midday of Tuesday 21 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:57  12:45 madhyāhna ends
11:0911:3311:5712:2112:4513:0913:33

0 of 48 minutes covered

Midday of Wednesday 22 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:57  12:45 madhyāhna ends
11:0911:3311:5712:2112:4513:0913:33

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 23:13 on Tue 21 Sep to 23:38 on Wed 22 Sep.

    1909-09-22T06:12:35Z → 1909-09-23T06:37:38Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:57–12:45 on the 21st, 11:57–12:45 on the 22nd.

    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 21st and 48 of 48 on the 22nd.

    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 37646 s

  5. 05

    Ruling

    Rādhāṣṭamī, Phoenix, 1909: Wednesday 22 September.

    confidence: determinate

Say it like this

In Phoenix, Rādhāṣṭamī 1909 falls on Wednesday 22 September. Aṣṭamī runs from 23:13 on Tue 21 Sep to 23:38 on Wed 22 Sep and covers all of madhyāhna that midday.

ahargana.org/phoenix/festivals/1909/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 22 Sep
Ahargaṇa, classicalDisc centre, no refractionWed 22 Sep
compat-drikpanchangComparison profileWed 22 Sep
No institution has a recorded ruling for Phoenix.

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 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles22:13 → 22:3811:2148 min11:210 min22 Sep
Chicago00:13 → 00:3811:1948 min11:190 min22 Sep
Jersey City01:13 → 01:3811:2548 min11:240 min22 Sep
Port of Spain02:13 → 02:3811:3548 min11:340 min22 Sep
London06:13 → 06:3811:2948 min11:290 min22 Sep
Durban08:13 → 08:3811:2548 min11:250 min22 Sep
Dubai09:54 → 10:1911:2948 min11:280 min22 Sep
Delhi11:43 → 12:0811:5048 min11:4918 min22 Sep
Kolkata11:43 → 12:0811:0511 min11:0548 min23 Sep
Singapore13:13 → 13:3811:340 min11:3348 min23 Sep
Sydney16:13 → 16:3811:240 min11:2448 min23 Sep
Suva18:08 → 18:3311:300 min11:3048 min23 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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