Ruling · Mahāṣṭamī (Durga Ashtami) · 1983

Friday 14 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 5 min 16 s.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Thursday 13 October

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

48 of 48 minutes covered

Midday of Friday 14 October

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

madhyāhna begins 11:26  12:14 madhyāhna ends
Aṣṭamī ends 12:19:28
10:3811:0211:2611:5012:1412:3813:02

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 10:11 on Thu 13 Oct to 12:19 on Fri 14 Oct.

    1983-10-13T06:41:27Z → 1983-10-14T08:49:28Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:26–12:14 on the 13th, 11:26–12:14 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 48 of 48 on the 14th.

    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 316 s

  5. 05

    Ruling

    Mahāṣṭamī, Tehran, 1983: Friday 14 October.

    confidence: determinate

Say it like this

In Tehran, Mahāṣṭamī (Durga Ashtami) 1983 falls on Friday 14 October. Aṣṭamī runs from 10:11 on Thu 13 Oct to 12:19 on Fri 14 Oct and covers all of madhyāhna that midday. It also reaches the previous midday for 48 minutes; by the rule the second midday is taken.

ahargana.org/tehran/festivals/1983/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 14 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 14 Oct
compat-drikpanchangComparison profileFri 14 Oct
No institution has a recorded ruling for Tehran.

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 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles23:41 → 01:4912:1548 min12:150 min13 Oct
Chicago01:41 → 03:4912:1348 min12:120 min13 Oct
Jersey City02:41 → 04:4912:1848 min12:180 min13 Oct
Port of Spain02:41 → 04:4911:2848 min11:280 min13 Oct
London07:41 → 09:4912:2248 min12:220 min13 Oct
Durban08:41 → 10:4911:1848 min11:180 min13 Oct
Dubai10:41 → 12:4911:4148 min11:4148 min14 Oct
Delhi12:11 → 14:1911:4320 min11:4348 min14 Oct
Kolkata12:11 → 14:1910:590 min10:5948 min14 Oct
Singapore14:41 → 16:4912:270 min12:2748 min14 Oct
Sydney16:41 → 18:4911:180 min11:1848 min14 Oct
Suva18:41 → 20:4911:290 min11:2948 min14 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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