Ruling · Rādhāṣṭamī · 2086

Monday 16 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 577 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 16 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:11  11:59 madhyāhna ends
10:2310:4711:1111:3511:5912:2312:47

48 of 48 minutes covered

Midday of Tuesday 17 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:10  11:58 madhyāhna ends
10:2210:4611:1011:3411:5812:2212:46

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 16 Sep to 01:33 on Tue 17 Sep.

    2086-09-15T16:51:49Z → 2086-09-16T17:32:56Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:11–11:59 on the 16th, 11:10–11:58 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 48 of 48 minutes on the 16th and 0 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 34645 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 2086: Monday 16 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 2086 falls on Monday 16 September. Aṣṭamī runs from 00:52 on Mon 16 Sep to 01:33 on Tue 17 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2086/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 16 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 16 Sep
compat-drikpanchangComparison profileMon 16 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 15thCoveredMadhyāhna 16thCoveredRuled
Los Angeles09:52 → 10:3312:2448 min12:240 min15 Sep
Chicago11:52 → 12:3312:2248 min12:2112 min15 Sep
Jersey City12:52 → 13:3312:2723 min12:2748 min16 Sep
Port of Spain12:52 → 13:3311:370 min11:3748 min16 Sep
London17:52 → 18:3312:310 min12:3148 min16 Sep
Durban18:52 → 19:3311:280 min11:2748 min16 Sep
Dubai20:52 → 21:3311:500 min11:5048 min16 Sep
Delhi22:22 → 23:0311:520 min11:5248 min16 Sep
Kolkata22:22 → 23:0311:080 min11:0748 min16 Sep
Singapore00:52 → 01:3312:360 min12:3648 min16 Sep
Sydney02:52 → 03:3311:270 min11:2748 min16 Sep
Suva04:52 → 05:3311:380 min11:3848 min16 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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