Easter has a different date every year
because it’s based on the moon phases.
In 325 CE, Constantine I led a council
of Christian bishops who decided that
Easter must always be a Sunday to
honor the resurrection of Jesus. They
also said it would immediately follow,
but not land on, the first full moon
after the Spring Equinox, which is why
the date can fall anywhere between
March 22 and April 25.