The stars appear to be moving in circles. In actuality, it is the Earth that is doing the moving. The Earth revolves about its axis, making one complete revolution per second. With the camera being on a rotating platform, the relatively stationary stars are given the appearance of moving in a circle.
Star watchers in the northern hemisphere know they can point their cameras at the north star during the night time hours and capture the apparent motion of stars along circular arcs as shown here.
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