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Easter falls on the Sunday after the Paschal full moon, which changes yearly.
The date of the Paschal full moon does not correspond directly to any astronomical event, but is determined by ecclesiastical tables.

en.wikipedia.org/wiki/Computus

Computus (Latin for "computation") is a calculation that determines the calendar date of Easter. ..... historical arguments and methods by which the present dates of Easter Sunday were decided in the late 16th century by the Catholic Church.

www.timeanddate.com/calendar/determining-easter-date.html

This soon led to Christians celebrating Easter on different dates. At the end of the 2nd century, some churches celebrated Easter on the day of the Passover, ...

www.catholic.com/qa/how-is-easter-sunday-determined-palm-sunday-ash-wednesday

Aug 4, 2011 ... They decided that Easter would be celebrated on the first Sunday after ... To find Ash Wednesday, you start with the date of Easter Sunday, ...

www.catholic.com/index.php/qa/how-is-the-date-for-easter-determined

Easter falls on the first Sunday following the first full moon after the vernal equinox. If the first full moon occurs on the equinox, Easter is the following Sunday.

www.gotquestions.org/date-easter-determined.html

This method of determining the date of Easter often results in Easter being before Passover and/or displaced far from Passover. Easter can potentially be ...

www.independent.co.uk/news/uk/this-britain/the-big-question-how-is-the-date-of-easter-determined-and-why-is-it-so-early-this-year-798980.html

Mar 21, 2008 ... Why does the date of Easter vary by more than a month? Because the ancient Egyptians and Hebrews used different calendars. The Egyptians ...

www.thoughtco.com/how-date-of-easter-is-calculated-542413

Apr 5, 2017 ... Easter occurs on a different date each year. How is the date of Easter determined for Western Christians and for Eastern Orthodox?

www.thoughtco.com/date-of-easter-change-every-year-700670

Apr 25, 2017 ... What follows is an attempt to clear up at least some of the confusion about how the date of Easter is determined and why it changes each year.

www.theguardian.com/notesandqueries/query/0,5753,-28458,00.html

The Council decided to keep Easter on a Sunday, the same Sunday throughout the world. To fix incontrovertibly the date for Easter, and to make it determinable ...