Why Does Easter's Date Change?

Because the death, burial and resurrection of Jesus Christ happened after Passover, they wanted Easter to always be celebrated following Passover. Because the Jewish holiday calendar is based on solar and lunar cycles, each feast day is movable, with dates shifting from year to year.

What determines when Easter is each year?

The simple standard definition of Easter is that it is the first Sunday after the full Moon that occurs on or after the spring equinox. If the full Moon falls on a Sunday then Easter is the next Sunday.

Does Easter's date change every year?

This means its date on the Gregorian calendar can vary every year. The date of Easter Sunday falls on the first Sunday after the first full moon following the vernal equinox in March.