The point to note is that thrones were set up for the Ancient of days to take His seat before the judgment began. To make matters even clearer, the thrones were said to have wheels (Daniel 7:9), making it clear that they are mobile thrones which can move and which apparently did move.This movement was from the Holy to the Most Holy portion of the heavenly sanctuary. Recall, also, that Jesus Christ, signified as the Son of man, was brought to the Ancient of days for the judgment to begin.