Epiphany (from Koine Greek ἐπιφάνεια "appearance", "manifestation") is a Christian feast day which celebrates the revelation of God made Man in the person of Jesus Christ. It falls on January 6 or on a Sunday close to that date. January 6 in the Julian Calendar, which is followed by some Eastern Churches, corresponds at present to January 19 in the Gregorian Calendar, which is the official civil calendar in most countries. On this day, Western Christians commemorate principally the visitation of the Biblical Magi to the child Jesus, i.e., his manifestation to the Gentiles; Eastern Christians commemorate the baptism of Jesus in the Jordan River, seen as his manifestation to the world as the Son of God. It is also called Theophany, especially by Eastern Christians.
http://en.wikipedia.org/wiki/Epiphany_(holiday )