Why is Easter so early this year?

Have you noticed how early Easter is this year? Have you been wondering why the date is not fixed, as it is with Christmas? The American Bible Society has the answer for the curious.

Easter is a moveable feast, so to speak, because it is not fixed in relation to the civil calendar and every year when the winter thaw begins, there is uncertainty as to its exact date. Easter is observed on the first Sunday after the first full moon on or after the Spring Equinox (March 20 or 21, depending on the Earth’s position). Easter is calculated according to lunar and solar calendars and is on a different date each year.