Ruling · Rādhāṣṭamī · 2087

Friday 5 September

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 622 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 Thursday 4 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:28  12:16 madhyāhna ends
10:4011:0411:2811:5212:1612:4013:04

0 of 48 minutes covered

Midday of Friday 5 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:28  12:16 madhyāhna ends
10:4011:0411:2811:5212:1612:4013:04

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 22:38 on Thu 4 Sep to 00:58 on Sat 6 Sep.

    2087-09-04T16:38:12Z → 2087-09-05T18:57:44Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:28–12:16 on the 4th, 11:28–12:16 on the 5th.

    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 4th and 48 of 48 on the 5th.

    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 37338 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chattogram, 2087: Friday 5 September.

    confidence: determinate

Say it like this

In Chattogram, Rādhāṣṭamī 2087 falls on Friday 5 September. Aṣṭamī runs from 22:38 on Thu 4 Sep to 00:58 on Sat 6 Sep and covers all of madhyāhna that midday.

ahargana.org/chattogram/festivals/2087/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 5 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 5 Sep
compat-drikpanchangComparison profileFri 5 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 4thCoveredMadhyāhna 5thCoveredRuled
Los Angeles09:38 → 11:5812:2848 min12:280 min4 Sep
Chicago11:38 → 13:5812:2548 min12:2548 min4 Sep
Jersey City12:38 → 14:5812:3141 min12:3148 min5 Sep
Port of Spain12:38 → 14:5811:410 min11:4148 min5 Sep
London17:38 → 19:5812:350 min12:3548 min5 Sep
Durban18:38 → 20:5811:310 min11:3148 min5 Sep
Dubai20:38 → 22:5811:540 min11:5448 min5 Sep
Delhi22:08 → 00:2811:560 min11:5648 min5 Sep
Kolkata22:08 → 00:2811:120 min11:1148 min5 Sep
Singapore00:38 → 02:5812:400 min12:4048 min5 Sep
Sydney02:38 → 04:5811:310 min11:3148 min5 Sep
Suva04:38 → 06:5811:420 min11:4248 min5 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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