Ruling · Gaurī Tṛtīyā (Gangaur) · 1921

Sunday 10 April

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 17 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 10 April

Taken. The only midday Tṛtīyā reaches.

madhyāhna begins 11:37  12:25 madhyāhna ends
Tṛtīyā begins 11:20:53
10:4911:1311:3712:0112:2512:4913:13

48 of 48 minutes covered

Midday of Monday 11 April

Tṛtīyā is absent from madhyāhna. Not taken.

madhyāhna begins 11:37  12:25 madhyāhna ends
10:4911:1311:3712:0112:2512:4913:13

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Tṛtīyā runs from 11:20 on Sun 10 Apr to 10:09 on Mon 11 Apr.

    1921-04-10T07:55:09Z → 1921-04-11T06:43:48Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:37–12:25 on the 10th, 11:37–12:25 on the 11th.

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

  3. 03

    Rule

    Tṛtīyā must be present during madhyāhna. It covers 48 of 48 minutes on the 10th and 0 of 48 on the 11th.

    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: unstated → only-day · margin 1016 s

  5. 05

    Ruling

    Gaurī Tṛtīyā, Tehran, 1921: Sunday 10 April.

    confidence: determinate

Say it like this

In Tehran, Gaurī Tṛtīyā (Gangaur) 1921 falls on Sunday 10 April. Tṛtīyā runs from 11:20 on Sun 10 Apr to 10:09 on Mon 11 Apr and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1921/gauri-tritiya · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 10 Apr
Ahargaṇa, classicalDisc centre, no refractionSun 10 Apr
compat-drikpanchangComparison profileSun 10 Apr
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/gauri-tritiya · ruleset 2026.3-draft

Month
Caitra, amānta
Pakṣa · aṅga
Śukla · Tṛtīyā
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 102

“S 3 Dolotsava, Gauri trtiya, Andolana trtiya, Saubhagya sayana vrata (paraviddha), Sarhul (Bihar).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceTṛtīyāMadhyāhna 10thCoveredMadhyāhna 11thCoveredRuled
Los Angeles23:55 → 22:4411:3148 min11:300 min10 Apr
Chicago02:55 → 01:4412:2848 min12:280 min10 Apr
Jersey City02:55 → 01:4411:3448 min11:340 min10 Apr
Port of Spain03:55 → 02:4411:4448 min11:430 min10 Apr
London08:55 → 07:4412:3848 min12:380 min10 Apr
Durban09:55 → 08:4411:3348 min11:330 min10 Apr
Dubai11:55 → 10:4411:5648 min11:560 min10 Apr
Delhi13:25 → 12:1411:590 min11:5915 min11 Apr
Kolkata13:25 → 12:1411:140 min11:1448 min11 Apr
Singapore14:55 → 13:4411:420 min11:4248 min11 Apr
Sydney17:55 → 16:4411:320 min11:3248 min11 Apr
Suva19:55 → 18:4411:440 min11:4348 min11 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
gauri-tritiya@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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