Ruling · Mahāṣṭamī (Durga Ashtami) · 1928

Monday 22 October

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 23 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 Sunday 21 October

Qualifies with 25 of 48 minutes. Not taken.

madhyāhna begins 11:20  12:08 madhyāhna ends
Aṣṭamī begins 11:43:29
10:3210:5611:2011:4412:0812:3212:56

25 of 48 minutes covered, the last 25

Midday of Monday 22 October

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

madhyāhna begins 11:20  12:08 madhyāhna ends
10:3210:5611:2011:4412:0812:3212:56

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 11:43 on Sun 21 Oct to 13:09 on Mon 22 Oct.

    1928-10-21T08:17:46Z → 1928-10-22T09:43:42Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 21st, 11:20–12:08 on the 22nd.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 25 of 48 minutes on the 21st and 48 of 48 on the 22nd.

    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 1378 s

  5. 05

    Ruling

    Mahāṣṭamī, Tehran, 1928: Monday 22 October.

    confidence: determinate

Say it like this

In Tehran, Mahāṣṭamī (Durga Ashtami) 1928 falls on Monday 22 October. Aṣṭamī runs from 11:43 on Sun 21 Oct to 13:09 on Mon 22 Oct and covers all of madhyāhna that midday. It also reaches the previous midday for 25 minutes; by the rule the second midday is taken.

ahargana.org/tehran/festivals/1928/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 22 Oct
Ahargaṇa, classicalDisc centre, no refractionMon 22 Oct
compat-drikpanchangComparison profileMon 22 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 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles00:18 → 01:4411:1348 min11:130 min21 Oct
Chicago02:18 → 03:4411:1148 min11:110 min21 Oct
Jersey City03:18 → 04:4411:1748 min11:170 min21 Oct
Port of Spain04:18 → 05:4411:2748 min11:270 min21 Oct
London08:18 → 09:4411:2148 min11:210 min21 Oct
Durban10:18 → 11:4411:1748 min11:1727 min22 Oct
Dubai12:18 → 13:4411:3910 min11:3948 min22 Oct
Delhi13:48 → 15:1411:420 min11:4148 min22 Oct
Kolkata13:48 → 15:1410:570 min10:5748 min22 Oct
Singapore15:18 → 16:4411:250 min11:2548 min22 Oct
Sydney18:18 → 19:4411:160 min11:1648 min22 Oct
Suva20:18 → 21:4411:270 min11:2748 min22 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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