Ruling · Rādhāṣṭamī · 1980

Wednesday 17 September

Determinatein Phoenix, under the Rashtriya Panchang method. Clear of every threshold by 337 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 16 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:59  12:47 madhyāhna ends
11:1111:3511:5912:2312:4713:1113:35

0 of 48 minutes covered

Midday of Wednesday 17 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:58  12:46 madhyāhna ends
11:1011:3411:5812:2212:4613:1013:34

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 18:24 on Tue 16 Sep to 19:14 on Wed 17 Sep.

    1980-09-17T01:23:39Z → 1980-09-18T02:14:28Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:59–12:47 on the 16th, 11:58–12:46 on the 17th.

    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 16th and 48 of 48 on the 17th.

    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 20218 s

  5. 05

    Ruling

    Rādhāṣṭamī, Phoenix, 1980: Wednesday 17 September.

    confidence: determinate

Say it like this

In Phoenix, Rādhāṣṭamī 1980 falls on Wednesday 17 September. Aṣṭamī runs from 18:24 on Tue 16 Sep to 19:14 on Wed 17 Sep and covers all of madhyāhna that midday.

ahargana.org/phoenix/festivals/1980/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 17 Sep
Ahargaṇa, classicalDisc centre, no refractionWed 17 Sep
compat-drikpanchangComparison profileWed 17 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 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles18:24 → 19:1412:2348 min12:230 min17 Sep
Chicago20:24 → 21:1412:2148 min12:200 min17 Sep
Jersey City21:24 → 22:1412:2648 min12:260 min17 Sep
Port of Spain21:24 → 22:1411:3648 min11:360 min17 Sep
London02:24 → 03:1412:3048 min12:300 min17 Sep
Durban03:24 → 04:1411:2748 min11:260 min17 Sep
Dubai05:24 → 06:1411:4948 min11:490 min17 Sep
Delhi06:54 → 07:4411:5148 min11:510 min17 Sep
Kolkata06:54 → 07:4411:0748 min11:070 min17 Sep
Singapore08:54 → 09:4412:0548 min12:050 min17 Sep
Sydney11:24 → 12:1411:2648 min11:2648 min17 Sep
Suva13:24 → 14:1411:370 min11:3748 min18 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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