Ruling · Anaṅga Trayodaśī · 2015

Wednesday 1 April

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 7 min 29 s.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

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

Midday of Wednesday 1 April

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 11:59  12:47 madhyāhna ends
Trayodaśī begins 12:39:03
11:1111:3511:5912:2312:4713:1113:35

7 of 48 minutes covered, the last 7

Midday of Thursday 2 April

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:58  12:46 madhyāhna ends
11:1011:3411:5812:2212:4613:1013:34

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Trayodaśī runs from 12:39 on Wed 1 Apr to 15:17 on Thu 2 Apr.

    2015-04-01T04:39:04Z → 2015-04-02T07:16:41Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:59–12:47 on the 1st, 11:58–12:46 on the 2nd.

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

  3. 03

    Rule

    Trayodaśī must be present during madhyāhna. It covers 7 of 48 minutes on the 1st and 48 of 48 on the 2nd.

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

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 449 s

  5. 05

    Ruling

    Anaṅga Trayodaśī, Baoding, 2015: Wednesday 1 April.

    confidence: determinate

Say it like this

In Baoding, Anaṅga Trayodaśī 2015 falls on Wednesday 1 April. Trayodaśī runs from 12:39 on Wed 1 Apr to 15:17 on Thu 2 Apr and covers 7 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken.

ahargana.org/baoding/festivals/2015/ananga-trayodashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 1 Apr
Ahargaṇa, classicalDisc centre, no refractionWed 1 Apr
compat-drikpanchangComparison profileWed 1 Apr
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/ananga-trayodashi · ruleset 2026.3-draft

Month
Caitra, amānta
Pakṣa · aṅga
Śukla · Trayodaśī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 102

“S 13 Ananga trayodasi (purvaviddha), Mahavira jayanti (Jain).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceTrayodaśīMadhyāhna 1stCoveredMadhyāhna 2ndCoveredRuled
Los Angeles21:39 → 00:1712:3348 min12:330 min1 Apr
Chicago23:39 → 02:1712:3148 min12:310 min1 Apr
Jersey City00:39 → 03:1712:3748 min12:360 min1 Apr
Port of Spain00:39 → 03:1711:4648 min11:460 min1 Apr
London05:39 → 08:1712:4148 min12:410 min1 Apr
Durban06:39 → 09:1711:3648 min11:350 min1 Apr
Dubai08:39 → 11:1711:5948 min11:590 min1 Apr
Delhi10:09 → 12:4712:0148 min12:0146 min1 Apr
Kolkata10:09 → 12:4711:1748 min11:1648 min1 Apr
Singapore12:39 → 15:1712:4548 min12:4448 min1 Apr
Sydney15:39 → 18:1712:350 min12:3548 min2 Apr
Suva16:39 → 19:1711:460 min11:4648 min2 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
ananga-trayodashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa