Ruling · Rādhāṣṭamī · 2080

Saturday 21 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 363 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 Friday 20 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:09  11:57 madhyāhna ends
10:2110:4511:0911:3311:5712:2112:45

0 of 48 minutes covered

Midday of Saturday 21 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:09  11:57 madhyāhna ends
10:2110:4511:0911:3311:5712:2112:45

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 18:00 on Fri 20 Sep to 19:47 on Sat 21 Sep.

    2080-09-20T10:00:10Z → 2080-09-21T11:47:07Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:09–11:57 on the 20th, 11:09–11:57 on the 21st.

    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 20th and 48 of 48 on the 21st.

    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 21787 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 2080: Saturday 21 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 2080 falls on Saturday 21 September. Aṣṭamī runs from 18:00 on Fri 20 Sep to 19:47 on Sat 21 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2080/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 21 Sep
Ahargaṇa, classicalDisc centre, no refractionSat 21 Sep
compat-drikpanchangComparison profileSat 21 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 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles03:00 → 04:4712:2248 min12:220 min20 Sep
Chicago05:00 → 06:4712:2048 min12:190 min20 Sep
Jersey City06:00 → 07:4712:2548 min12:250 min20 Sep
Port of Spain06:00 → 07:4711:3548 min11:350 min20 Sep
London11:00 → 12:4712:2948 min12:2918 min20 Sep
Durban12:00 → 13:4711:2513 min11:2548 min21 Sep
Dubai14:00 → 15:4711:480 min11:4848 min21 Sep
Delhi15:30 → 17:1711:500 min11:5048 min21 Sep
Kolkata15:30 → 17:1711:060 min11:0548 min21 Sep
Singapore18:00 → 19:4712:340 min12:3448 min21 Sep
Sydney20:00 → 21:4711:250 min11:2548 min21 Sep
Suva22:00 → 23:4711:360 min11:3648 min21 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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