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Easy answer is that this is a Jewish "Leap Year" - it gets a little complicated after that.
In order to keep up with the time difference between the Jewish calendar year and the actual solar (rotation of the earth around the sun) year, there is an extra month added 7 times in each 19 year cycle. The first month on the Jewish calendar (biblical - not civil) is Adar, which is the month during which Passover occurs. On leap year, a second Adar is added. Some celebrate Passover during Adar 1 - but it is most common to celebrate in Adar 2.
Since the "normal" calendar we're used to doesn't have this extra month, Easter is calculated in the same way it always is - which several folks have explained in their answers.
I'd also add that Easter actually usually coincides with the Feast of First Fruits rather than Passover - although the term Passover is used as sort of an "umbrella" to refer to all of the first 3 spring feasts, because of their close proximity to one another (clear as mud - huh??)
Here's a link to a more detailed explanation (although it's not specifically dealing with the Passover - the explanation still applies):
http://www.chabad.org/library/article_cd...
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