The answer
The answer to this question is that both events, the birth of our Lord (Psalm 110:3) and His Resurrection (John 20:1), took place early in the morning. So the liturgy starts at night and should end very early in the morning as it is done in St. Mark Cathedral in Cairo. Regarding the feast of Theophany, it is done at night because Nicodemus visited the Lord by night and spoke about the Mystery of Baptism (John 3:2) and there is a tradition that says that the Lord was baptized early in the morning.Answered by His Eminence Metropolitan Youssef (opens in a new tab)