Easter and the moonDon't take this computer generated translation for serious :-)
"On the council of Nicäa (325 n. Chr.) was specified that Easter always falls on Sunday after the first spring full moon.
Since the duration of a yearly is not multiple of the duration of a moon circulation around the earth, Easter to a mobile celebration between that becomes 22. March and 25. April of each yearly.
Further church holidays are derived from the Ostersonntag. Like that ashtray Wednesday is 46 days before Ostersonntag. Christi Ascension Day is 39 days, Pfingstsonntag 49 days and Fronleichnam 60 days after Ostersonntag. These rules apply until today! To attention is however: The full moon calculation for Easter is based on a church full moon calculation and not on the astronomical full moon calculation!"
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original german site: http://www.joergmueller.de/ostern.html
For further Information please follow this link: www.wikipedia.org