The Ascension of Jesus to Heaven happened 40 days after the resurrection, in the presence of eleven of his apostles.
The Ascension implies Jesus' humanity being taken into Heaven. The Feast of the Ascension, celebrated on the 40th day of Easter (always a Thursday), is one of the chief feasts of the Christian year. The feast dates from the 4th century.
The Ascension is one of the five major milestones in the gospel narrative of the life of Jesus, the others being Baptism, Transfiguration, Crucifixion, and Resurrection.
By the 6th century the iconography of the Ascension in Christian art had been established and by the 9th century Ascension scenes were being depicted on domes of churches. Many ascension scenes have two parts, an upper (Heavenly) part and a lower (earthly) part.
The rising Jesus is often shown blessing with his right hand - directed towards the earthly group below him this meaning he is blessing the entire Church.