Ruling · Rādhāṣṭamī · 2072

Monday 19 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 590 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 Monday 19 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

Midday of Tuesday 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

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

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 00:52 on Mon 19 Sep to 01:19 on Tue 20 Sep.

    2072-09-18T16:52:13Z → 2072-09-19T17:18:33Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:09–11:57 on the 19th, 11:09–11:57 on the 20th.

    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 19th and 0 of 48 on the 20th.

    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 35428 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 2072: Monday 19 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 2072 falls on Monday 19 September. Aṣṭamī runs from 00:52 on Mon 19 Sep to 01:19 on Tue 20 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2072/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 19 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 19 Sep
compat-drikpanchangComparison profileMon 19 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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles09:52 → 10:1912:2348 min12:220 min18 Sep
Chicago11:52 → 12:1912:2048 min12:200 min18 Sep
Jersey City12:52 → 13:1912:2622 min12:2648 min19 Sep
Port of Spain12:52 → 13:1911:360 min11:3648 min19 Sep
London17:52 → 18:1912:300 min12:3048 min19 Sep
Durban18:52 → 19:1911:260 min11:2648 min19 Sep
Dubai20:52 → 21:1911:490 min11:4848 min19 Sep
Delhi22:22 → 22:4911:510 min11:5148 min19 Sep
Kolkata22:22 → 22:4911:070 min11:0648 min19 Sep
Singapore00:52 → 01:1912:350 min12:3448 min19 Sep
Sydney02:52 → 03:1911:260 min11:2548 min19 Sep
Suva04:52 → 05:1911:370 min11:3648 min19 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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