The council decided in favor of celebrating the resurrection on the first Sunday after the first full moon following the vernal equinox , independently of the Bible 's Hebrew Calendar ( see also Quartodecimanism ) , and authorized the Bishop of Alexandria ( presumably using the Alexandrian calendar ) to announce annually the exact date to his fellow bishops . The council decided in favor of celebrating Easter on the first Sunday after the first full moon following the vernal equinox , independent of the Hebrew Calendar ( see also Quartodecimanism and Easter controversy ) . It authorized the Bishop of Alexandria ( presumably using the Alexandrian calendar ) to announce annually the exact date to his fellow bishops .