Ruling · Jitāṣṭamī (Jitiya) · 1980

Wednesday 1 October

Boundaryin Tehran, under the Rashtriya Panchang method. Both evenings qualify and the rule does not say which to take. Say “contested”.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

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

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Tuesday 30 September

Qualifies with 17 of 97 minutes. Not taken.

17:49 sunsetpradoṣa ends 19:27
Aṣṭamī begins 19:09:35
17:2517:4918:1318:3719:0119:2519:49

17 of 97 minutes covered, the last 17

Evening of Wednesday 1 October

Taken. Both evenings qualify; the rule is silent, and this one is covered longer.

17:48 sunsetpradoṣa ends 19:26
Aṣṭamī ends 18:37:50
17:2417:4818:1218:3619:0019:2419:48

50 of 98 minutes covered, the first 50

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

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 19:10 on Tue 30 Sep to 18:38 on Wed 1 Oct.

    1980-09-30T15:39:35Z → 1980-10-01T15:07:51Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:49–19:27 on the 30th, 17:48–19:26 on the 1st.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Aṣṭamī must be present during pradoṣa. It covers 17 of 97 minutes on the 30th and 50 of 98 on the 1st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Both evenings qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 1028 s

  5. 05

    Ruling

    Jitāṣṭamī, Tehran, 1980: Wednesday 1 October.

    confidence: boundary (tie-break-unstated)

Say it like this

In Tehran, Jitāṣṭamī (Jitiya) 1980 falls on Wednesday 1 October. Aṣṭamī runs from 19:10 on Tue 30 Sep to 18:38 on Wed 1 Oct and covers 50 of 98 minutes of pradoṣa that evening. It also reaches the previous evening for 17 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/tehran/festivals/1980/jitashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 1 Oct
Ahargaṇa, classicalDisc centre, no refractionWed 1 Oct
compat-drikpanchangComparison profileTue 30 Sep
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/jitashtami · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Kṛṣṇa · Aṣṭamī
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“K 8 Mahalaksmi vrata samapana (current at moonrise), Jitastami (pradosa), Jimutavahana puja” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīSunset 30thCoveredSunset 1stCoveredRuled
Los Angeles08:40 → 08:0818:3897 min18:360 min30 Sep
Chicago10:40 → 10:0818:3398 min18:320 min30 Sep
Jersey City11:40 → 11:0818:3998 min18:380 min30 Sep
Port of Spain11:40 → 11:0817:5796 min17:560 min30 Sep
London16:40 → 16:0818:4099 min18:380 min30 Sep
Durban17:40 → 17:0817:5693 min17:570 min30 Sep
Dubai19:40 → 19:0818:063 min18:0562 min1 Oct
Delhi21:10 → 20:3818:080 min18:0797 min1 Oct
Kolkata21:10 → 20:3817:250 min17:2497 min1 Oct
Singapore23:10 → 22:3818:270 min18:2795 min1 Oct
Sydney01:40 → 01:0817:570 min17:5793 min1 Oct
Suva03:40 → 03:0818:030 min18:0494 min1 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
jitashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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