The Equinox, (equal night), is the beginning of the Easter season. The first Sunday following the first full moon after the equinox is Easter. The celebration of new and abundant life. The lily represents the new life and the rabbit, abundant life.
For some cultures, the start of spring is considered a time of rebirth and renewal. And some religious holidays are timed to be celebrated after the spring equinox, including Easter and Passover
Happy Spring Equinox