Ruling · Rādhāṣṭamī · 1985

Saturday 21 September

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 328 minutes.

Decide it for

ChattogramDelhiKolkataSingaporeSydneyJersey City

22°20′ N 91°50′ E · Asia/Dhaka · GeoNames 1205733

The two middays

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

Midday of Saturday 21 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

48 of 48 minutes covered

Midday of Sunday 22 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

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 05:53 on Sat 21 Sep to 04:19 on Sun 22 Sep.

    1985-09-20T23:53:21Z → 1985-09-21T22:19:14Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 21st, 11:21–12:09 on the 22nd.

    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 21st and 0 of 48 on the 22nd.

    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 19699 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chattogram, 1985: Saturday 21 September.

    confidence: determinate

Say it like this

In Chattogram, Rādhāṣṭamī 1985 falls on Saturday 21 September. Aṣṭamī runs from 05:53 on Sat 21 Sep to 04:19 on Sun 22 Sep and covers all of madhyāhna that midday.

ahargana.org/chattogram/festivals/1985/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 21 Sep
Ahargaṇa, classicalDisc centre, no refractionSat 21 Sep
compat-drikpanchangComparison profileSat 21 Sep
No institution has a recorded ruling for Chattogram.

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 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles16:53 → 15:1912:220 min12:2248 min21 Sep
Chicago18:53 → 17:1912:200 min12:1948 min21 Sep
Jersey City19:53 → 18:1912:250 min12:2548 min21 Sep
Port of Spain19:53 → 18:1911:350 min11:3548 min21 Sep
London00:53 → 23:1912:290 min12:2948 min21 Sep
Durban01:53 → 00:1911:260 min11:2548 min21 Sep
Dubai03:53 → 02:1911:480 min11:4848 min21 Sep
Delhi05:23 → 03:4911:500 min11:5048 min21 Sep
Kolkata05:23 → 03:4911:060 min11:0648 min21 Sep
Singapore07:53 → 06:1912:340 min12:3448 min21 Sep
Sydney09:53 → 08:1911:250 min11:2548 min21 Sep
Suva11:53 → 10:1911:360 min11:3630 min21 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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