Ruling · Mahāṣṭamī (Durga Ashtami) · 1966

Friday 21 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 497 minutes.

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 20 October

Aṣṭamī is absent from madhyāhna. Not taken.

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

0 of 48 minutes covered

Midday of Friday 21 October

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

Aṣṭamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 20:30 on Thu 20 Oct to 21:49 on Fri 21 Oct.

    1966-10-20T16:59:56Z → 1966-10-21T18:18:36Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 20th, 11:25–12:13 on the 21st.

    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 20th and 48 of 48 on the 21st.

    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 29817 s

  5. 05

    Ruling

    Mahāṣṭamī, Tehran, 1966: Friday 21 October.

    confidence: determinate

Say it like this

In Tehran, Mahāṣṭamī (Durga Ashtami) 1966 falls on Friday 21 October. Aṣṭamī runs from 20:30 on Thu 20 Oct to 21:49 on Fri 21 Oct and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1966/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 21 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 21 Oct
compat-drikpanchangComparison profileFri 21 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 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles10:00 → 11:1912:1448 min12:130 min20 Oct
Chicago12:00 → 13:1912:1148 min12:1148 min21 Oct
Jersey City13:00 → 14:1912:175 min12:1748 min21 Oct
Port of Spain13:00 → 14:1911:270 min11:2748 min21 Oct
London18:00 → 19:1912:210 min12:2148 min21 Oct
Durban19:00 → 20:1911:170 min11:1748 min21 Oct
Dubai21:00 → 22:1911:400 min11:3948 min21 Oct
Delhi22:30 → 23:4911:420 min11:4248 min21 Oct
Kolkata22:30 → 23:4910:570 min10:5748 min21 Oct
Singapore00:30 → 01:4911:560 min11:5548 min21 Oct
Sydney03:00 → 04:1911:160 min11:1648 min21 Oct
Suva05:00 → 06:1911:270 min11:2748 min21 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

About Ahargaṇa