Ruling · Gaurī Tṛtīyā (Gangaur) · 2021

Thursday 15 April

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

Decide it for

ThāneDelhiKolkataSingaporeSydneyJersey City

19°12′ N 72°58′ E · Asia/Kolkata · GeoNames 1254661

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Wednesday 14 April

Qualifies with 14 of 48 minutes. Not taken.

madhyāhna begins 12:15  13:03 madhyāhna ends
Tṛtīyā begins 12:48:07
11:2711:5112:1512:3913:0313:2713:51

14 of 48 minutes covered, the last 14

Midday of Thursday 15 April

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

madhyāhna begins 12:14  13:02 madhyāhna ends
11:2611:5012:1412:3813:0213:2613:50

48 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 12:48 on Wed 14 Apr to 15:28 on Thu 15 Apr.

    2021-04-14T07:18:08Z → 2021-04-15T09:57:31Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:15–13:03 on the 14th, 12:14–13:02 on the 15th.

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

  3. 03

    Rule

    Tṛtīyā must be present during madhyāhna. It covers 14 of 48 minutes on the 14th and 48 of 48 on the 15th.

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

  4. 04

    Tie-break

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

    priority: unstated → greater-coverage · margin 866 s

  5. 05

    Ruling

    Gaurī Tṛtīyā, Thāne, 2021: Thursday 15 April.

    confidence: boundary (tie-break-unstated)

Say it like this

In Thāne, Gaurī Tṛtīyā (Gangaur) 2021 falls on Thursday 15 April. Tṛtīyā runs from 12:48 on Wed 14 Apr to 15:28 on Thu 15 Apr and covers all of madhyāhna that midday. It also reaches the previous midday for 14 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/thane/festivals/2021/gauri-tritiya · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 15 Apr
Ahargaṇa, classicalDisc centre, no refractionThu 15 Apr
compat-drikpanchangComparison profileThu 15 Apr
No institution has a recorded ruling for Thāne.

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 14thCoveredMadhyāhna 15thCoveredRuled
Los Angeles00:18 → 02:5812:2948 min12:290 min14 Apr
Chicago02:18 → 04:5812:2748 min12:270 min14 Apr
Jersey City03:18 → 05:5812:3348 min12:330 min14 Apr
Port of Spain03:18 → 05:5811:4248 min11:420 min14 Apr
London08:18 → 10:5812:3748 min12:370 min14 Apr
Durban09:18 → 11:5811:3248 min11:3226 min14 Apr
Dubai11:18 → 13:5811:5548 min11:5548 min14 Apr
Delhi12:48 → 15:2811:580 min11:5748 min15 Apr
Kolkata12:48 → 15:2811:130 min11:1348 min15 Apr
Singapore15:18 → 17:5812:410 min12:4148 min15 Apr
Sydney17:18 → 19:5811:310 min11:3148 min15 Apr
Suva19:18 → 21:5811:430 min11:4248 min15 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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