Ruling · Rādhāṣṭamī · 2082

Monday 31 August

Boundaryin Xining, under the Rashtriya Panchang method. A threshold is only 4 min 05 s away. Say “contested”.

Decide it for

XiningDelhiKolkataSingaporeSydneyJersey City

36°38′ N 101°45′ E · Asia/Shanghai · GeoNames 1788852

The two middays

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

Midday of Sunday 30 August

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:50  13:38 madhyāhna ends
Aṣṭamī begins 13:41:39
12:0212:2612:5013:1413:3814:0214:26

0 of 48 minutes covered

Midday of Monday 31 August

Taken. Aṣṭamī reaches neither midday; the rule takes the second day.

madhyāhna begins 12:49  13:37 madhyāhna ends
12:0112:2512:4913:1313:3714:0114:25

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 13:42 on Sun 30 Aug to 11:52 on Mon 31 Aug.

    2082-08-30T05:41:39Z → 2082-08-31T03:52:11Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:50–13:38 on the 30th, 12:49–13:37 on the 31st.

    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 30th and 0 of 48 on the 31st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: unstated → second-day · margin 245 s < 300 s

  5. 05

    Ruling

    Rādhāṣṭamī, Xining, 2082: Monday 31 August.

    confidence: boundary (margin)

Say it like this

In Xining, Rādhāṣṭamī 2082 falls on Monday 31 August. Aṣṭamī runs from 13:42 on Sun 30 Aug to 11:52 on Mon 31 Aug, and reaches madhyāhna on neither day. It is 4 min 05 s from a threshold: treat the date as contested.

ahargana.org/xining/festivals/2082/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 31 Aug
Ahargaṇa, classicalDisc centre, no refractionMon 31 Aug
compat-drikpanchangComparison profileSun 30 Aug
No institution has a recorded ruling for Xining.

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 30thCoveredMadhyāhna 31stCoveredRuled
Los Angeles22:42 → 20:5212:2948 min12:290 min30 Aug
Chicago00:42 → 22:5212:2748 min12:270 min30 Aug
Jersey City01:42 → 23:5212:3348 min12:320 min30 Aug
Port of Spain01:42 → 23:5211:4348 min11:420 min30 Aug
London06:42 → 04:5212:3748 min12:360 min30 Aug
Durban07:42 → 05:5211:3348 min11:330 min30 Aug
Dubai09:42 → 07:5211:5548 min11:550 min30 Aug
Delhi11:12 → 09:2211:5848 min11:570 min30 Aug
Kolkata11:12 → 09:2211:1348 min11:130 min30 Aug
Singapore13:42 → 11:5212:420 min12:410 min31 Aug
Sydney15:42 → 13:5211:320 min11:3248 min31 Aug
Suva17:42 → 15:5211:430 min11:4348 min31 Aug
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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