The Ascension of Jesus (anglicized from the Vulgate Latin Acts 1:9-11 section title: Ascensio Iesu) is the Christian teaching found in the New Testament that the resurrected Jesus was taken up to Heaven in his resurrected body, in the presence of eleven of his apostles, occurring 40 days after the resurrection. In the biblical narrative, an angel tells the watching disciples that Jesus’ second coming will take place in the same manner as his ascension.
The canonical gospels include two brief descriptions of the ascension of Jesus in Luke 24:50-53 and Mark 16:19. A more detailed account of Jesus’ bodily Ascension into the clouds is then given in the Acts of the Apostles (1:9-11).
The ascension of Jesus is professed in the Nicene Creed and in the Apostles’ Creed. 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 back at least to the later 4th century, as is widely attested. 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.
Source: wikipedia.org | The Holy Bible
In 2017 Ascension of Jesus in USA falls on May 25.