Whether you celebrate the Ascension on Thursday or on Sunday, here is a good meditation on the subject.
From the lessons for the office of matins for the Solemnity of the Ascension:
1st on the Lord’s Ascension.
After the blessed and glorious Resurrection of our Lord Jesus Christ, wherein the Divine Power raised up in three days the true Temple of God Which the iniquity of the Jews had destroyed (John ii. 19), God was pleased to ordain, by His Most Sacred Will, and in His Providence for our instruction and the profit of our souls, a season of forty days which season, dearly beloved brethren, doth end on this day. During that season the bodily Presence of the Lord still lingered on earth, that the reality of the fact of His having risen again from the dead might be armed with all needful proofs.