c. 29 “Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of the heavens will be shaken. 30 Then the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. 31 And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other. I believe this be both a reference to Christ coming in Judgment against apostate Israel, and well as Christ ascension depicting Christ of taking the reigns of His Kingdom and dominion. The Lord coming on clouds is used throught the OT in reference to both judgment of nations and His ascension, and we must ignore that we need to interpret scripture with scripture to understand the full meaning of this.