Ruling · Mahāṣṭamī (Durga Ashtami) · 2045

Wednesday 18 October

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 8 min 17 s.

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 Tuesday 17 October

Qualifies with 8 of 48 minutes. Not taken.

madhyāhna begins 11:14  12:02 madhyāhna ends
Aṣṭamī begins 11:53:36
10:2610:5011:1411:3812:0212:2612:50

8 of 48 minutes covered, the last 8

Midday of Wednesday 18 October

Taken. Both middays qualify; the rule takes the second.

madhyāhna begins 11:14  12:02 madhyāhna ends
10:2610:5011:1411:3812:0212:2612:50

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 11:54 on Tue 17 Oct to 14:05 on Wed 18 Oct.

    2045-10-17T05:53:36Z → 2045-10-18T08:04:48Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:14–12:02 on the 17th, 11:14–12:02 on the 18th.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 8 of 48 minutes on the 17th and 48 of 48 on the 18th.

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

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 497 s

  5. 05

    Ruling

    Mahāṣṭamī, Chattogram, 2045: Wednesday 18 October.

    confidence: determinate

Say it like this

In Chattogram, Mahāṣṭamī (Durga Ashtami) 2045 falls on Wednesday 18 October. Aṣṭamī runs from 11:54 on Tue 17 Oct to 14:05 on Wed 18 Oct and covers all of madhyāhna that midday. It also reaches the previous midday for 8 minutes; by the rule the second midday is taken.

ahargana.org/chattogram/festivals/2045/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 18 Oct
Ahargaṇa, classicalDisc centre, no refractionWed 18 Oct
compat-drikpanchangComparison profileWed 18 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 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles22:54 → 01:0512:1448 min12:140 min17 Oct
Chicago00:54 → 03:0512:1248 min12:110 min17 Oct
Jersey City01:54 → 04:0512:1748 min12:170 min17 Oct
Port of Spain01:54 → 04:0511:2748 min11:270 min17 Oct
London06:54 → 09:0512:2148 min12:210 min17 Oct
Durban07:54 → 10:0511:1748 min11:170 min17 Oct
Dubai09:54 → 12:0511:4048 min11:4025 min18 Oct
Delhi11:24 → 13:3511:4248 min11:4248 min18 Oct
Kolkata11:24 → 13:3510:5822 min10:5848 min18 Oct
Singapore13:54 → 16:0512:260 min12:2648 min18 Oct
Sydney16:54 → 19:0512:170 min12:1748 min18 Oct
Suva17:54 → 20:0511:280 min11:2848 min18 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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