Luke 24: 51 by Koch

This is an ascension cross symbol. Note the clouds, the cross lifted from
 the earth and the scripture Koch includes is the same as one of three used
on Ascension Sunday.

“And it came to pass, while he blessed them, he was parted from them, and carried up into heaven.” Luke 24:51 King James Version

Rudolf Koch's "Life of Jesus"

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       The Feast of the Ascension of Our Lord and Savior Jesus Christ, also known as Holy Thursday, Ascension Day, or Ascension Thursday, commemorates the Christian belief of the bodily Ascension of Jesus into heaven. It is one of the ecumenical feasts (i.e., universally celebrated) of Christian churches, ranking with the feasts of the Passion, of Easter, and Pentecost. Ascension Day is traditionally celebrated on a Thursday, the fortieth day of Easter (following the accounts given in Mark 16:19, Luke 24:51, Acts 1:2 ), although some Christian denominations have moved the observance to the following Sunday.