Ruling · Rādhāṣṭamī · 1963

Monday 26 August

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 Monday 26 August

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

madhyāhna begins 12:06  12:54 madhyāhna ends
11:1811:4212:0612:3012:5413:1813:42

48 of 48 minutes covered

Midday of Tuesday 27 August

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 12:06  12:54 madhyāhna ends
Aṣṭamī ends 13:01:10
11:1811:4212:0612:3012:5413:1813:42

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 10:43 on Mon 26 Aug to 13:01 on Tue 27 Aug.

    1963-08-26T17:42:34Z → 1963-08-27T20:01:11Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:06–12:54 on the 26th, 12:06–12:54 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 48 of 48 on the 27th.

    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 454 s

  5. 05

    Ruling

    Rādhāṣṭamī, Phoenix, 1963: Monday 26 August.

    confidence: boundary (tie-break-unstated)

Say it like this

In Phoenix, Rādhāṣṭamī 1963 falls on Monday 26 August. Aṣṭamī runs from 10:43 on Mon 26 Aug to 13:01 on Tue 27 Aug and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/phoenix/festivals/1963/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 26 Aug
Ahargaṇa, classicalDisc centre, no refractionMon 26 Aug
compat-drikpanchangComparison profileMon 26 Aug
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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles10:43 → 13:0112:3148 min12:3031 min26 Aug
Chicago12:43 → 15:0112:2834 min12:2848 min27 Aug
Jersey City13:43 → 16:0112:340 min12:3448 min27 Aug
Port of Spain13:43 → 16:0111:440 min11:4448 min27 Aug
London18:43 → 21:0112:380 min12:3848 min27 Aug
Durban19:43 → 22:0111:340 min11:3448 min27 Aug
Dubai21:43 → 00:0111:570 min11:5648 min27 Aug
Delhi23:13 → 01:3111:590 min11:5948 min27 Aug
Kolkata23:13 → 01:3111:140 min11:1448 min27 Aug
Singapore01:13 → 03:3112:130 min12:1248 min27 Aug
Sydney03:43 → 06:0111:330 min11:3348 min27 Aug
Suva05:43 → 08:0111:440 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

About Ahargaṇa