Ruling · Rādhāṣṭamī · 2097

Friday 13 September

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 108 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 Friday 13 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:25  12:13 madhyāhna ends
10:3711:0111:2511:4912:1312:3713:01

48 of 48 minutes covered

Midday of Saturday 14 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:24  12:12 madhyāhna ends
10:3611:0011:2411:4812:1212:3613:00

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 07:15 on Fri 13 Sep to 09:37 on Sat 14 Sep.

    2097-09-13T01:14:33Z → 2097-09-14T03:36:33Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 13th, 11:24–12:12 on the 14th.

    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 13th and 0 of 48 on the 14th.

    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 6466 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chattogram, 2097: Friday 13 September.

    confidence: determinate

Say it like this

In Chattogram, Rādhāṣṭamī 2097 falls on Friday 13 September. Aṣṭamī runs from 07:15 on Fri 13 Sep to 09:37 on Sat 14 Sep and covers all of madhyāhna that midday.

ahargana.org/chattogram/festivals/2097/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 13 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 13 Sep
compat-drikpanchangComparison profileFri 13 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 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles18:15 → 20:3712:2548 min12:240 min13 Sep
Chicago20:15 → 22:3712:2248 min12:220 min13 Sep
Jersey City21:15 → 23:3712:2848 min12:280 min13 Sep
Port of Spain21:15 → 23:3711:3848 min11:380 min13 Sep
London02:15 → 04:3712:3248 min12:320 min13 Sep
Durban03:15 → 05:3711:2848 min11:280 min13 Sep
Dubai05:15 → 07:3711:5148 min11:500 min13 Sep
Delhi06:45 → 09:0711:5348 min11:530 min13 Sep
Kolkata06:45 → 09:0711:0948 min11:080 min13 Sep
Singapore09:15 → 11:3712:3748 min12:360 min13 Sep
Sydney11:15 → 13:3711:2848 min11:2748 min13 Sep
Suva13:15 → 15:3711:390 min11:3848 min14 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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