Ruling · Mahāṣṭamī (Durga Ashtami) · 1981

Tuesday 6 October

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 519 minutes.

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 Tuesday 6 October

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:17  12:05 madhyāhna ends
10:2910:5311:1711:4112:0512:2912:53

48 of 48 minutes covered

Midday of Wednesday 7 October

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:16  12:04 madhyāhna ends
10:2810:5211:1611:4012:0412:2812:52

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 00:44 on Tue 6 Oct to 02:38 on Wed 7 Oct.

    1981-10-05T18:44:01Z → 1981-10-06T20:37:54Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:17–12:05 on the 6th, 11:16–12:04 on the 7th.

    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 6th and 0 of 48 on the 7th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: paraviddha → only-day · margin 31112 s

  5. 05

    Ruling

    Mahāṣṭamī, Chattogram, 1981: Tuesday 6 October.

    confidence: determinate

Say it like this

In Chattogram, Mahāṣṭamī (Durga Ashtami) 1981 falls on Tuesday 6 October. Aṣṭamī runs from 00:44 on Tue 6 Oct to 02:38 on Wed 7 Oct and covers all of madhyāhna that midday.

ahargana.org/chattogram/festivals/1981/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 6 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 6 Oct
compat-drikpanchangComparison profileTue 6 Oct
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/mahashtami · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 8 Mahastami (paraviddha)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 5thCoveredMadhyāhna 6thCoveredRuled
Los Angeles11:44 → 13:3812:1748 min12:1748 min6 Oct
Chicago13:44 → 15:3812:150 min12:1448 min6 Oct
Jersey City14:44 → 16:3812:200 min12:2048 min6 Oct
Port of Spain14:44 → 16:3811:300 min11:3048 min6 Oct
London19:44 → 21:3812:240 min12:2448 min6 Oct
Durban20:44 → 22:3811:210 min11:2048 min6 Oct
Dubai22:44 → 00:3811:430 min11:4348 min6 Oct
Delhi00:14 → 02:0811:450 min11:4548 min6 Oct
Kolkata00:14 → 02:0811:010 min11:0148 min6 Oct
Singapore02:14 → 04:0811:590 min11:5948 min6 Oct
Sydney04:44 → 06:3811:200 min11:2048 min6 Oct
Suva06:44 → 08:3811:310 min11:3148 min6 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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