Ruling · Rādhāṣṭamī · 1971

Sunday 29 August

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 477 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 28 August

Aṣṭamī is absent from madhyāhna. Not taken.

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

0 of 48 minutes covered

Midday of Sunday 29 August

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:30  12:18 madhyāhna ends
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 20:15 on Sat 28 Aug to 21:28 on Sun 29 Aug.

    1971-08-28T14:14:53Z → 1971-08-29T15:27:34Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:30–12:18 on the 28th, 11:30–12:18 on the 29th.

    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 28th and 48 of 48 on the 29th.

    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 28616 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chattogram, 1971: Sunday 29 August.

    confidence: determinate

Say it like this

In Chattogram, Rādhāṣṭamī 1971 falls on Sunday 29 August. Aṣṭamī runs from 20:15 on Sat 28 Aug to 21:28 on Sun 29 Aug and covers all of madhyāhna that midday.

ahargana.org/chattogram/festivals/1971/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 29 Aug
Ahargaṇa, classicalDisc centre, no refractionSun 29 Aug
compat-drikpanchangComparison profileSun 29 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 28thCoveredMadhyāhna 29thCoveredRuled
Los Angeles07:15 → 08:2812:3048 min12:300 min28 Aug
Chicago09:15 → 10:2812:2848 min12:270 min28 Aug
Jersey City10:15 → 11:2812:3348 min12:330 min28 Aug
Port of Spain10:15 → 11:2811:4348 min11:430 min28 Aug
London15:15 → 16:2812:370 min12:3748 min29 Aug
Durban16:15 → 17:2811:330 min11:3348 min29 Aug
Dubai18:15 → 19:2811:560 min11:5648 min29 Aug
Delhi19:45 → 20:5811:580 min11:5848 min29 Aug
Kolkata19:45 → 20:5811:140 min11:1448 min29 Aug
Singapore21:45 → 22:5812:120 min12:1248 min29 Aug
Sydney00:15 → 01:2811:330 min11:3348 min29 Aug
Suva02:15 → 03:2811:440 min11:4448 min29 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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