The Ascension of the Lord took place 40 days after Easter, which this year, is celebrated on Ascension Thursday, May 9. In most dioceses in the Unites States, though, the celebration of this solemnity and holy day of obligation is transferred to the following Sunday, May 12.
The Ascension of the Lord is detailed in the Scriptures and in our creeds. Every Sunday, we profess it in the Nicene Creed:
“(Jesus) ascended into heaven, and is seated at the right hand of the Father. He will come again in glory to judge the living and the dead and his kingdom will have no end.”
Jesus’ ascension concluded his work on earth to bring about our redemption that he began on Good Friday. The Ascension of the Lord is followed 10 days later by the feast of Pentecost.