Ever wonder why some years Easter is in April and sometimes — like this year — late March? Why isn't it a fixed date, like most other holidays? Well, it's a bit complicated.

First off, the simple answer: Easter falls on the first Sunday after the first full moon that occurs on or after the vernal equinox.

Okay, maybe that's not so simple. Let's break down each of those things a bit further and get into some history.

The vernal equinox is the first day of spring, usually March 21, that's easy enough. And we all know what a full moon is. Now let's get into why those factors were chosen.

The Bible says that Jesus was resurrected around the time of the Jewish Passover, which was celebrated on the first full moon after the vernal equinox. Some Christians began celebrating Easter directly on Passover, while others waited for the following Sunday, because that's the day of the week the Resurrection occurred. But in 325 A.D. at the Council of Nicaea, Emperor Constantine sought to unify the date, choosing the Sunday after the full moon.

While Christmas is always December 25, the date of Easter affects numerous other Christian holidays throughout the year. Palm Sunday, Good Friday, Ascension Day and Pentecost all depend on when Easter falls.

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