Today marks the day Jesus Christ ascended back to the Father in Heaven. He ascended under His own power, as God the Son. In many dioceses, the celebration of the Ascension is moved to Sunday. Then, the next Sunday is Pentecost, the day the Holy Spirit, sent by God the Son, came upon and gave life to His Church in the Apostles and Mary.
Then he led them [out] as far as Bethany, raised his hands, and blessed
them. 51 As He blessed them He parted from them and was taken up to
Heaven. 52 They did Him homage and then returned to Jerusalem with
53and they were continually in the temple praising God. (Luke 24)
19 So then the Lord Jesus, after He spoke to them, was taken up into Heaven and took His seat at the right hand of God.
20 But they went forth and preached everywhere,
while the Lord worked with them and confirmed the word through
accompanying signs.] (Mark 16)
6 When they had gathered together they asked Him, "Lord, are you at this time going to restore the kingdom to Israel?” 7 He answered them, “It is not for you to know the times or seasons that the Father has established by his own authority. 8
But you will receive power when the holy Spirit comes upon you, and you
will be my witnesses in Jerusalem, throughout Judea and Samaria, and to
the ends of the earth.” 9 When He had said this, as they were looking
on, He was lifted up, and a cloud took Him from their sight. 10 While
they were looking intently at the sky as He was going, suddenly two men
dressed in white garments stood beside them. 11 They said, "Men of
Galilee, why are you standing there looking at the sky? This Jesus who
has been taken up from you into Heaven will return in the same way as
you have seen Him going into Heaven." 12 Then they returned to Jerusalem from the mount called Olivet, which is near Jerusalem, a sabbath day’s journey away.