This day commemorates the Baptism of Jesus in the Jordan River by St. John the Baptist. On this occasion, Jesus entered into His ministry and acquired His first disciples; St. John proclaimed Christ the Lamb of God, whose way he had prepared; and the Triune nature of the Godhead was manifested. Click here to learn more on ewtn.com.
Solemnities, Feasts, and Memorials are days which are celebrated in commemoration of the sacred mysteries and events recorded in the history of our redemption, in memory of the Virgin Mother of Christ, or of His apostles, martyrs, and saints.
About the image: The Baptism of Christ, by Guido Reni (1575-1642).