Ruling · Gopāṣṭamī · 1909

Saturday 20 November

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 105 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 Saturday 20 November

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

48 of 48 minutes covered

Midday of Sunday 21 November

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

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 09:35 on Sat 20 Nov to 08:04 on Sun 21 Nov.

    1909-11-20T06:10:20Z → 1909-11-21T04:39:26Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:21–12:09 on the 20th, 11:21–12:09 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 48 of 48 minutes on the 20th and 0 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: unstated → only-day · margin 6325 s

  5. 05

    Ruling

    Gopāṣṭamī, Tehran, 1909: Saturday 20 November.

    confidence: determinate

Say it like this

In Tehran, Gopāṣṭamī 1909 falls on Saturday 20 November. Aṣṭamī runs from 09:35 on Sat 20 Nov to 08:04 on Sun 21 Nov and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1909/gopashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 20 Nov
Ahargaṇa, classicalDisc centre, no refractionSat 20 Nov
compat-drikpanchangComparison profileSat 20 Nov
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/gopashtami · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 8 Gopastami, Gosthastami.” 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 Angeles22:10 → 20:3911:1548 min11:150 min20 Nov
Chicago00:10 → 22:3911:1248 min11:120 min20 Nov
Jersey City01:10 → 23:3911:1848 min11:180 min20 Nov
Port of Spain02:10 → 00:3911:2848 min11:280 min20 Nov
London06:10 → 04:3911:2248 min11:220 min20 Nov
Durban08:10 → 06:3911:1848 min11:180 min20 Nov
Dubai09:51 → 08:2011:2148 min11:210 min20 Nov
Delhi11:40 → 10:0911:4348 min11:430 min20 Nov
Kolkata11:40 → 10:0910:586 min10:580 min20 Nov
Singapore13:10 → 11:3911:260 min11:2613 min21 Nov
Sydney16:10 → 14:3911:170 min11:1748 min21 Nov
Suva18:05 → 16:3411:230 min11:2348 min21 Nov
Profile · tradition
pac-rp@2026.1 · smarta
Rule
gopashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa