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Eric Weisstein's World of Astronomy: Easter
Explanation of why "[t]he commonly stated rule that Easter is the first Sunday after the first full moon after the vernal equinox is not quite correct. Easter is actually the first Sunday strictly after the 'Paschal full moon' ... [which] may differ from the date of the actual full moon by up to two days." Includes table of Easter dates. The author is a scientist with advanced degrees in physics and planetary science.
http://scienceworld.wolfram.com/astronomy/Easter.html

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