Ruling · Rādhāṣṭamī · 2089

Monday 12 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 87 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

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

Midday of Sunday 11 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:12  12:00 madhyāhna ends
10:2410:4811:1211:3612:0012:2412:48

0 of 48 minutes covered

Midday of Monday 12 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:12  12:00 madhyāhna ends
10:2410:4811:1211:3612:0012:2412:48

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 13:28 on Sun 11 Sep to 14:46 on Mon 12 Sep.

    2089-09-11T05:27:36Z → 2089-09-12T06:46:29Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:12–12:00 on the 11th, 11:12–12:00 on the 12th.

    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 11th and 48 of 48 on the 12th.

    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 5231 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 2089: Monday 12 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 2089 falls on Monday 12 September. Aṣṭamī runs from 13:28 on Sun 11 Sep to 14:46 on Mon 12 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2089/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 12 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 12 Sep
compat-drikpanchangComparison profileMon 12 Sep
No institution has a recorded ruling for Daqing.

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 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles22:28 → 23:4612:2548 min12:250 min11 Sep
Chicago00:28 → 01:4612:2348 min12:230 min11 Sep
Jersey City01:28 → 02:4612:2948 min12:280 min11 Sep
Port of Spain01:28 → 02:4611:3948 min11:380 min11 Sep
London06:28 → 07:4612:3348 min12:320 min11 Sep
Durban07:28 → 08:4611:2948 min11:290 min11 Sep
Dubai09:28 → 10:4611:5148 min11:510 min11 Sep
Delhi10:58 → 12:1611:5448 min11:5323 min11 Sep
Kolkata10:58 → 12:1611:0948 min11:0948 min11 Sep
Singapore13:28 → 14:4612:370 min12:3748 min12 Sep
Sydney15:28 → 16:4611:280 min11:2848 min12 Sep
Suva17:28 → 18:4611:390 min11:3948 min12 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

About Ahargaṇa