As we stand in church and look up we see the image of Christ in glory, the Pantocrator, in the dome or another prominent place. This is in fact the central detail in the icon of the Ascension: Christ, enthroned upon the cherubim, taken up from the disciples. Placing this icon in the domes of our churches is a graphic reminder that “This same Jesus, who was taken up from you into heaven, will so come in like manner as you saw Him go into heaven” (Acts 1:11).

Eparchy of NEwton, The Liturgical Year – The Pentecostarion