Ruling · Vaiśākhī (Baisakhi) · 2028

Thursday 13 April

Determinatein Ujjain, under the Rashtriya Panchang method. Clear of every threshold by 503 minutes.

Decide it for

23°11′ N 75°47′ E · Asia/Kolkata · GeoNames 1253914

The two days

A tick is five ghaṭīs, two hours. The day is sunrise to the next sunrise.

Day of Thursday 13 April

Taken. The transit falls in this day.

06:08 sunrisenext sunrise 06:07
Sun enters Meṣa 21:44:14
05:4409:4413:4417:4421:4401:4405:44

Falls in this day

Day of Friday 14 April

The transit does not fall in this day. Not taken.

06:07 sunrisenext sunrise 06:06
05:4309:4313:4317:4321:4301:4305:43

Does not fall in this day

The day, the window the rule readsThe instant the Sun enters Meṣa

How it was decided

  1. 01

    Aṅga

    The Sun enters Meṣa at 21:44 on Thu 13 Apr.

    2028-04-13T16:14:14Z · nirayana, lahiri-iae1985

  2. 02

    Kāla

    The day runs from sunrise to the next sunrise: from 06:08 on the 13th, and from 06:07 on the 14th.

    day: sunrise-to-sunrise · sunrise: upper limb, 31′ + 16′

  3. 03

    Rule

    The festival is kept on the day of the transit, the day counted from sunrise. The transit falls on the 13th, not the 14th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106

  4. 04

    Tie-break

    An instant falls in one day and no other. No tie-break is needed.

    day counted from sunrise → only-day · margin 30178 s

  5. 05

    Ruling

    Vaiśākhī, Ujjain, 2028: Thursday 13 April.

    confidence: determinate

Say it like this

In Ujjain, Vaiśākhī (Baisakhi) 2028 falls on Thursday 13 April. The Sun enters Meṣa at 21:44 on Thu 13 Apr, and the rule counts the day from sunrise. By the Tamil rule for the first day of a solar month, which gives a transit after sunset to the next day, it is 14 April.

ahargana.org/ujjain/festivals/2028/vaishakhi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 13 Apr
Ahargaṇa, classicalDisc centre, no refractionThu 13 Apr
compat-drikpanchangComparison profileThu 13 Apr
Counted from midnightCRC 1955, p. 106Thu 13 Apr
Past sunset, the next day (the Tamil rule)CRC 1955, p. 244Fri 14 Apr
No institution has a recorded ruling for Ujjain.

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

The rule, as data

/rules/vaishakhi · ruleset 2026.3-draft

Sign entered
Meṣa
Zodiac
Nirayana
Ayanāṃśa
lahiri-iae1985
Day counted from
Sunrise
Tie-break
None: an instant
Reference
CRC 1955, p. 106

“Mesadi — Cadaka puja (Bengal), Bahag Bihu (Assam), Cheiraoba (Manipur), Visu (T. C. State), Vaisakhi (on the samkramana day commencing from sunrise).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106. “The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106. The other names in the row (Cadaka puja, Bahag Bihu, Cheiraoba, Visu) are regional observances and wait with the regional rows.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSun enters MeṣaSunrise 13thCoveredSunrise 14thCoveredRuled
Los Angeles09:1406:24falls06:23no13 Apr
Chicago11:1406:13falls06:11no13 Apr
Jersey City12:1406:20falls06:18no13 Apr
Port of Spain12:1405:56falls05:56no13 Apr
London17:1406:09falls06:06no13 Apr
Durban18:1406:14falls06:15no13 Apr
Dubai20:1405:58falls05:57no13 Apr
Delhi21:4405:58falls05:57no13 Apr
Kolkata21:4405:18falls05:17no13 Apr
Singapore00:1407:01falls07:01no13 Apr
Sydney02:1406:17falls06:17no13 Apr
Suva04:1406:16falls06:16no13 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vaishakhi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s