He is not here: for He is risen! - Matthew 28:6
Every Christian knows that Jesus was crucified in Jerusalem at the time of the Passover, and in this way became the perfect Passover sacrifice, "the Lamb of God which taketh away the sin of the world" (John 1:29). Since the early centuries of the church, Christians have honored the death and resurrection of Jesus in the celebration of Easter. And while the observance of Easter has changed over the centuries, it is based on the Hebrew Passover.
* Hebrew Roots *
We read in the Book of Exodus how the LORD used Moses lead the Israelites out of Egypt. In Exodus 12, the LORD sent the final plague, smiting the firstborn of all Egypt. The Israelites were saved by sacrificing a lamb and covering their doorframes with its blood, so that the LORD would "pass over" the house and not smite the firstborn of Israel. And the LORD commanded that the Israelites remember the Passover in a seven day feast....
And this day shall be unto you a memorial; and ye shall keep it a feast to the LORD throughout your generations; ye shall keep it a feast by an ordinance for ever. - Exodus 12:14.
Please finish this fascinating article at Classical Astronomy.