Adam Clarke on Daniel 7:9

The thrones were cast down - דמיו might be translated erected, so the Vulgate, positi sunt, and so all the versions; but that ours is a proper translation, is sufficiently evident from Dan 3:6, Dan 3:16, Dan 3:20; Dan 6:17, etc.; where the original word can be used in no other sense than that of throwing or casting down. There is a reference here to preparations made for a general assize, or to the convocation of the sanhedrin, where the father of the consistory sat with his assessors on each side in the form of a semicircle, and the people stood before them.

The Ancient of days - God Almighty; and this is the only place in the sacred writings where God the Father is represented in a human form.