
Reflection: The Solemnity of the Ascension of the Lord commemorates the fortieth day after the Resurrection when Jesus ascended body and soul into Heaven and took His seat at the right hand of His Father. Traditionally, the location of the Ascension is believed to be less than a mile east of the Old City of Jerusalem, and that spot is marked by the Chapel of the Ascension, which is said to contain a miraculous imprint of the footprints of Christ before He ascended. The event of the Ascension is found in the Gospels and Acts (Mark 16:19–20; Luke 24:50–53; Acts 1:6–12). It is also alluded to in various other passages (John 6:62; Ephesians 4:7–10; 1 Timothy 3:16; 1 Peter 3:21–22).
Only Jesus and His Blessed Mother have entered into the glories of Heaven, body and soul. Jesus’ Ascension implies that He did so by His own authority and power. The Blessed Virgin Mary’s Assumption implies that she entered Heaven, body and soul, by God’s power, and not her own.
The Ascension marks the completion of Jesus’ earthly mission. He first united His divine nature with human nature through the Incarnation at the moment of the Annunciation. Saint Thomas Aquinas teaches that from that moment on, Jesus, the Son of God, experienced three types of knowledge. First, being God, He had beatific knowledge, that is, a direct knowledge of His essence, the Father’s essence, and the Holy Spirit’s essence. Second, He had the perfection of infused knowledge, that is, a bestowal of all truths given to the angels in Heaven, especially those truths necessary for the completion of His divine mission. Third, He began to acquire learned knowledge, or experiential knowledge. This was the form of knowledge attained through His human nature from the senses and His human reason.
Source (an excerpt): https://mycatholic.life/saints/saints-of-the-liturgical-year/the-ascension-of-the-lord/