Ruling · Rādhāṣṭamī · 2031

Wednesday 24 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 502 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 Tuesday 23 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:08  11:56 madhyāhna ends
10:2010:4411:0811:3211:5612:2012:44

0 of 48 minutes covered

Midday of Wednesday 24 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:08  11:56 madhyāhna ends
10:2010:4411:0811:3211:5612:2012:44

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 22:17 on Tue 23 Sep to 20:18 on Wed 24 Sep.

    2031-09-23T14:17:24Z → 2031-09-24T12:17:36Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:08–11:56 on the 23rd, 11:08–11:56 on the 24th.

    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 23rd and 48 of 48 on the 24th.

    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 30109 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 2031: Wednesday 24 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 2031 falls on Wednesday 24 September. Aṣṭamī runs from 22:17 on Tue 23 Sep to 20:18 on Wed 24 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2031/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 24 Sep
Ahargaṇa, classicalDisc centre, no refractionWed 24 Sep
compat-drikpanchangComparison profileWed 24 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 23rdCoveredMadhyāhna 24thCoveredRuled
Los Angeles07:17 → 05:1812:2148 min12:210 min23 Sep
Chicago09:17 → 07:1812:1948 min12:180 min23 Sep
Jersey City10:17 → 08:1812:2448 min12:240 min23 Sep
Port of Spain10:17 → 08:1811:3448 min11:340 min23 Sep
London15:17 → 13:1812:280 min12:2848 min24 Sep
Durban16:17 → 14:1811:250 min11:2448 min24 Sep
Dubai18:17 → 16:1811:470 min11:4748 min24 Sep
Delhi19:47 → 17:4811:490 min11:4948 min24 Sep
Kolkata19:47 → 17:4811:050 min11:0548 min24 Sep
Singapore22:17 → 20:1812:330 min12:3348 min24 Sep
Sydney00:17 → 22:1811:240 min11:2448 min24 Sep
Suva02:17 → 00:1811:350 min11:3548 min24 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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