Ruling · Rādhāṣṭamī · 1948

Thursday 9 September

Boundaryin Phoenix, under the Rashtriya Panchang method. Both middays qualify and the rule does not say which to take. Say “contested”.

Decide it for

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 Thursday 9 September

Taken. Both middays qualify; the rule is silent, and this one is covered longer.

madhyāhna begins 12:01  12:49 madhyāhna ends
Aṣṭamī begins 11:57:44
11:1311:3712:0112:2512:4913:1313:37

48 of 48 minutes covered

Midday of Friday 10 September

Qualifies with 22 of 48 minutes. Not taken.

madhyāhna begins 12:01  12:49 madhyāhna ends
Aṣṭamī ends 12:23:05
11:1311:3712:0112:2512:4913:1313:37

22 of 48 minutes covered, the first 22

Aṣṭamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 11:58 on Thu 9 Sep to 12:23 on Fri 10 Sep.

    1948-09-09T18:57:44Z → 1948-09-10T19:23:06Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:01–12:49 on the 9th, 12:01–12:49 on the 10th.

    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 9th and 22 of 48 on the 10th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 208 s < 300 s

  5. 05

    Ruling

    Rādhāṣṭamī, Phoenix, 1948: Thursday 9 September.

    confidence: boundary (margin, tie-break-unstated)

Say it like this

In Phoenix, Rādhāṣṭamī 1948 falls on Thursday 9 September. Aṣṭamī runs from 11:58 on Thu 9 Sep to 12:23 on Fri 10 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 22 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 3 min 28 s from a threshold: treat the date as contested.

ahargana.org/phoenix/festivals/1948/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 9 Sep
Ahargaṇa, classicalDisc centre, no refractionThu 9 Sep
compat-drikpanchangComparison profileThu 9 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 9thCoveredMadhyāhna 10thCoveredRuled
Los Angeles11:58 → 12:2312:2648 min12:260 min9 Sep
Chicago13:58 → 14:2312:230 min12:2348 min10 Sep
Jersey City14:58 → 15:2312:290 min12:2948 min10 Sep
Port of Spain14:58 → 15:2311:390 min11:3948 min10 Sep
London19:58 → 20:2312:330 min12:3348 min10 Sep
Durban20:58 → 21:2311:290 min11:2948 min10 Sep
Dubai22:58 → 23:2311:520 min11:5248 min10 Sep
Delhi00:28 → 00:5311:540 min11:5448 min10 Sep
Kolkata00:28 → 00:5311:100 min11:0948 min10 Sep
Singapore02:28 → 02:5312:080 min12:0848 min10 Sep
Sydney04:58 → 05:2311:290 min11:2948 min10 Sep
Suva06:58 → 07:2311:400 min11:4048 min10 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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