Do you know how they come up with the date for easter?
good friday falls on the first friday after or on the first full moon of the spring equinox (first day of spring) so if you know when the first full moon of spring is good friday falls on the 1st friday after it of which easter follows on the sunday trust me this is true if you don’t believe me try working out easter for next year if you use this method you will be spot on, i hope this helps you!