Ruling · Rādhāṣṭamī · 2077

Friday 27 August

Boundaryin Chattogram, under the Rashtriya Panchang method. Both middays qualify and the rule does not say which to take. Say “contested”.

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 26 August

Qualifies with 26 of 48 minutes. Not taken.

madhyāhna begins 11:30  12:18 madhyāhna ends
Aṣṭamī begins 11:52:22
10:4211:0611:3011:5412:1812:4213:06

26 of 48 minutes covered, the last 26

Midday of Friday 27 August

Taken. Both middays qualify; the rule is silent, and this one is covered longer.

madhyāhna begins 11:30  12:18 madhyāhna ends
Aṣṭamī ends 13:00:34
10:4211:0611:3011:5412:1812:4213:06

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 11:52 on Thu 26 Aug to 13:01 on Fri 27 Aug.

    2077-08-26T05:52:23Z → 2077-08-27T07:00:34Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:30–12:18 on the 26th, 11:30–12:18 on the 27th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 26 of 48 minutes on the 26th and 48 of 48 on the 27th.

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

  4. 04

    Tie-break

    Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 1314 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chattogram, 2077: Friday 27 August.

    confidence: boundary (tie-break-unstated)

Say it like this

In Chattogram, Rādhāṣṭamī 2077 falls on Friday 27 August. Aṣṭamī runs from 11:52 on Thu 26 Aug to 13:01 on Fri 27 Aug and covers all of madhyāhna that midday. It also reaches the previous midday for 26 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/chattogram/festivals/2077/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 27 Aug
Ahargaṇa, classicalDisc centre, no refractionFri 27 Aug
compat-drikpanchangComparison profileFri 27 Aug
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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles22:52 → 00:0112:3148 min12:300 min26 Aug
Chicago00:52 → 02:0112:2848 min12:280 min26 Aug
Jersey City01:52 → 03:0112:3448 min12:330 min26 Aug
Port of Spain01:52 → 03:0111:4448 min11:440 min26 Aug
London06:52 → 08:0112:3848 min12:380 min26 Aug
Durban07:52 → 09:0111:3448 min11:340 min26 Aug
Dubai09:52 → 11:0111:5748 min11:560 min26 Aug
Delhi11:22 → 12:3111:5948 min11:5932 min26 Aug
Kolkata11:22 → 12:3111:1440 min11:1448 min27 Aug
Singapore13:52 → 15:0112:430 min12:4248 min27 Aug
Sydney15:52 → 17:0111:330 min11:3348 min27 Aug
Suva17:52 → 19:0111:440 min11:4448 min27 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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