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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

Aug 4, 2011 ... 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 ...

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.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 ...

www.assa.org.au/edm

Easter Sunday is the date of the annual ... when the exact year for this removal is decided.

www.compellingtruth.org/date-Easter-determined.html

Even if the timeframe of the crucifixion and resurrection could be determined within the week, we still don't know the specific date—or even the year. The most  ...