Ruling · Rādhāṣṭamī · 2011

Monday 5 September

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 7 min 09 s.

Decide it for

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 Sunday 4 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:28  12:16 madhyāhna ends
Aṣṭamī begins 12:22:52
10:4011:0411:2811:5212:1612:4013:04

0 of 48 minutes covered

Midday of Monday 5 September

Taken. Aṣṭamī reaches neither midday; the rule takes the second day.

madhyāhna begins 11:27  12:15 madhyāhna ends
Aṣṭamī ends 11:04:21
10:3911:0311:2711:5112:1512:3913:03

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 12:23 on Sun 4 Sep to 11:04 on Mon 5 Sep.

    2011-09-04T06:22:53Z → 2011-09-05T05:04:21Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:28–12:16 on the 4th, 11:27–12:15 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 0 of 48 on the 5th.

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

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: unstated → second-day · margin 429 s

  5. 05

    Ruling

    Rādhāṣṭamī, Chattogram, 2011: Monday 5 September.

    confidence: determinate

Say it like this

In Chattogram, Rādhāṣṭamī 2011 falls on Monday 5 September. Aṣṭamī runs from 12:23 on Sun 4 Sep to 11:04 on Mon 5 Sep, and reaches madhyāhna on neither day.

ahargana.org/chattogram/festivals/2011/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 5 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 5 Sep
compat-drikpanchangComparison profileSun 4 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 Angeles23:23 → 22:0412:2848 min12:270 min4 Sep
Chicago01:23 → 00:0412:2548 min12:250 min4 Sep
Jersey City02:23 → 01:0412:3148 min12:310 min4 Sep
Port of Spain02:23 → 01:0411:4148 min11:410 min4 Sep
London07:23 → 06:0412:3548 min12:350 min4 Sep
Durban08:23 → 07:0411:3148 min11:310 min4 Sep
Dubai10:23 → 09:0411:5448 min11:530 min4 Sep
Delhi11:53 → 10:3411:5648 min11:560 min4 Sep
Kolkata11:53 → 10:3411:127 min11:110 min4 Sep
Singapore14:23 → 13:0412:400 min12:3925 min5 Sep
Sydney16:23 → 15:0411:310 min11:3048 min5 Sep
Suva18:23 → 17:0411:420 min11:4148 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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