Easter doesn't really follow a Liturgical calendar, never really has, as it's not really the "day" that "he has risen".
Passover is probably a bit closer in actual dates (first full moon following the vernal equinox), and the vernal (Spring) equinox is "the closest" as that IS the original holiday for the "Sun has Risen" festivals (that had nothing to do with Jesus).
"Christian" "Catholic" Easter is based /planned on /around the Vernal (Spring) equinox and Passover, but tries not to have it on the same exact day. So it changes every year. ...But always tries to have it on a Sunday.
According to the Bible, Jesus death and resurrection occurred "around the time" of the Jewish Passover, which was celebrated on the first full moon following the vernal equinox.
This soon led to Christians celebrating Easter on different dates. At the end of the 2nd century, some churches celebrated Easter on the day of the Passover, while others celebrated it on the following Sunday.
This link leads to explanations of some of the more fun stuff:
The pagan roots of Easter | Heather McDougall | Comment is free | The Guardian
This link has some fun Scientific experiments about the equinoxes:
Witchvox Article
"Try this sometime with your children or a young niece, nephew or cousin: on the day of the Vernal or Autumnal Equinox, just a few moments before the exact moment of the equinox, go outside with a raw egg. Find a reasonably level place on the sidewalk or driveway. For a few moments just before and just after the equinox, you can balance the egg upright (wider end down) by simply setting it down on the ground. No kidding! It will stand up all by itself. Kids love this, and most adults are amazed and delighted, too."
At any rate, It IS a holiday and I hope you all had a truly great one
T
And for those looking for more....
This guy has alot to say...and makes a great argument!
Christ?s Resurrection Was Not on Sunday
Theirs is next Sunday. Their liturgical calendar is different from ours. Visit Greece and you can celebrate Easter twice!!