Epiphany (Koine Greek: ἐπιφάνεια, epiphaneia, "manifestation", "striking appearance"^[1]) or Theophany^[2] (Ancient Greek (ἡ) Θεοφάνεια, Τheophaneia meaning "vision of God"^[3]), which traditionally falls on 6 January, is a Christian feast day that celebrates the revelation of God the Son as a human being in Jesus Christ. Western Christians commemorate principally (but not solely) the visitation of the Biblical Magi to the Baby Jesus, and thus Jesus' physical 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.^[4]

Eastern Churches following the Julian Calendar observe the Theophany feast on what for most countries is 19 January^[5] because of the 13-day difference today between that calendar and the generally used Gregorian calendar.^[6]