Ruling · Rathayātrā · 1980

Sunday 13 July

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 69 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 13 July

Taken. The only midday Dvitīyā reaches.

madhyāhna begins 12:46  13:34 madhyāhna ends
11:5812:2212:4613:1013:3413:5814:22

48 of 48 minutes covered

Midday of Monday 14 July

Dvitīyā is absent from madhyāhna. Not taken.

madhyāhna begins 12:46  13:34 madhyāhna ends
11:5812:2212:4613:1013:3413:5814:22

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Dvitīyā runs from 11:09 on Sun 13 Jul to 11:37 on Mon 14 Jul.

    1980-07-13T06:38:35Z → 1980-07-14T07:07:09Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:46–13:34 on the 13th, 12:46–13:34 on the 14th.

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

  3. 03

    Rule

    Dvitīyā must be present during madhyāhna. It covers 48 of 48 minutes on the 13th and 0 of 48 on the 14th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: paraviddha → only-day · margin 4127 s

  5. 05

    Ruling

    Rathayātrā, Tehran, 1980: Sunday 13 July.

    confidence: determinate

Say it like this

In Tehran, Rathayātrā 1980 falls on Sunday 13 July. Dvitīyā runs from 11:09 on Sun 13 Jul to 11:37 on Mon 14 Jul and covers all of madhyāhna that midday.

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

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 13 Jul
Ahargaṇa, classicalDisc centre, no refractionSun 13 Jul
compat-drikpanchangComparison profileSun 13 Jul
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/rathayatra · ruleset 2026.3-draft

Month
Āṣāḍha, amānta
Pakṣa · aṅga
Śukla · Dvitīyā
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 102

“S 2 Rathayatra (paraviddha, special when combined with naksatra 'Pusya')” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102. The row calls the day special with Puṣya nakṣatra; the nakṣatra is not tested.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvitīyāMadhyāhna 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles23:39 → 00:0712:3548 min12:350 min13 Jul
Chicago01:39 → 02:0712:3248 min12:320 min13 Jul
Jersey City02:39 → 03:0712:3848 min12:380 min13 Jul
Port of Spain02:39 → 03:0711:4848 min11:480 min13 Jul
London07:39 → 08:0712:4248 min12:420 min13 Jul
Durban08:39 → 09:0711:3848 min11:380 min13 Jul
Dubai10:39 → 11:0712:0048 min12:000 min13 Jul
Delhi12:09 → 12:3712:0342 min12:0334 min14 Jul
Kolkata12:09 → 12:3711:180 min11:1848 min14 Jul
Singapore14:09 → 14:3712:160 min12:1648 min14 Jul
Sydney16:39 → 17:0711:370 min11:3748 min14 Jul
Suva18:39 → 19:0711:480 min11:4848 min14 Jul
Profile · tradition
pac-rp@2026.1 · smarta
Rule
rathayatra@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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