The EPIPHANY . . . is the manifestation of Christ to the peoples of the earth. The winter solstice was kept on Jan. 6 at some places during the first centuries of the Christian Era. In opposition to pagan festivals, Christians chose this day to celebrate the various manifestations, or “epiphanies,” of Jesus’ divinity. These showings of his divinity included his birth, the coming of the Magi, his baptism, and the Wedding at Cana where he miraculously changed water into wine. The day was called “The Feast of Lights.”

The coming of the Magi is celebrated on the Feast of the Epiphany, Jan. 6, in the BCP. The Baptism of our Lord is celebrated on the First Sunday after the Epiphany.

• “The Gentiles shall come to your light, and kings to the brightness of your rising” – (Isaiah 60:3).
• “Indeed He says, ‘It is too small a thing that You should be My Servant to raise up the tribes of Jacob, and to restore the preserved ones of Israel; I will also give You as a light to the Gentiles,
  that You should be My salvation to the ends of the earth.’” – (Isaiah 49:6b).
• “For from the rising of the sun, even to its going down, my name shall be great among the Gentiles; in every place incense shall be offered to My name, and a pure offering; for My name shall be great among the nations,” says the Lord of hosts. – (Malachi 1:11).

Click here to learn more about the third season in the church calendar year, The Season after The Epiphany.

Source: https://www.episcopalchurch.org/glossary/epiphany-the/