Easter is set as the first Sunday after the first full moon occurring on or after the vernal equinox. From that point forward, the Easter date depends on the ecclesiastical approximation of March 21 for the vernal equinox. Easter is delayed by one week if the full moon is on Sunday, which decreases the chances of it falling on the same day as the Jewish Passover.
True for the Western catholic churches (catholic being the broad "catholic", not the Roman Catholic Church, although that is part of the catholic churches).
For the Eastern catholic church's, which use a Julian calendar rather than the Gregorian calendar, the formula is the same, however the vernal equinox is different, as is the definition of the full moon. This often pushes Easter in the Eastern churches later in the year than the Western churches.
This year, Easter is the same date in both the Eastern and Western churches. Happy Easter to ALL my Christian friends, and I hope my Jewish friends enjoyed Passover this past week.
And I'm sorry Ralph, but the new kicking rule being a foul at all, and especially it being a dead ball foul may be the dumbest rule passed in years. Any other "illegal formation" can be corrected up until the time the ball becomes live, and doesn't kill the play. Why should this particular type of illegal formation be any different?