Ruling · Rādhāṣṭamī · 1951

Sunday 9 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 69 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 Saturday 8 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:14  12:02 madhyāhna ends
10:2610:5011:1411:3812:0212:2612:50

0 of 48 minutes covered

Midday of Sunday 9 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:13  12:01 madhyāhna ends
10:2510:4911:1311:3712:0112:2512:49

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 15:19 on Sat 8 Sep to 13:10 on Sun 9 Sep.

    1951-09-08T07:18:46Z → 1951-09-09T05:10:00Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 8th, 11:13–12:01 on the 9th.

    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 8th and 48 of 48 on the 9th.

    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 4126 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 1951: Sunday 9 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 1951 falls on Sunday 9 September. Aṣṭamī runs from 15:19 on Sat 8 Sep to 13:10 on Sun 9 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1951/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 9 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 9 Sep
compat-drikpanchangComparison profileSun 9 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 8thCoveredMadhyāhna 9thCoveredRuled
Los Angeles00:19 → 22:1012:2648 min12:260 min8 Sep
Chicago02:19 → 00:1012:2448 min12:240 min8 Sep
Jersey City03:19 → 01:1012:3048 min12:290 min8 Sep
Port of Spain03:19 → 01:1011:4048 min11:390 min8 Sep
London08:19 → 06:1012:3448 min12:340 min8 Sep
Durban09:19 → 07:1011:3048 min11:300 min8 Sep
Dubai11:19 → 09:1011:5348 min11:520 min8 Sep
Delhi12:49 → 10:4011:550 min11:540 min9 Sep
Kolkata12:49 → 10:4011:100 min11:100 min9 Sep
Singapore14:49 → 12:4012:090 min12:0832 min9 Sep
Sydney17:19 → 15:1011:290 min11:2948 min9 Sep
Suva19:19 → 17:1011:400 min11:4048 min9 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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