This is a poorly-written way of saying that the stars of the “fixed sphere” move at the same trajectory, while the “wandering stars” (planets) don’t.
This is also stupid and suggests that they don’t quite understand what “trajectory” means. The stars near the poles have vastly different apparent trajectories (from the geocentric view) than the ones near the equator; the former appear to orbit the earth more slowly and in a tighter circle than the “faster” equatorial ones. I think that they meant “same relative position”. (Of course, they don’t do that either - they’re orbiting the galaxy at different speeds and positions, but they’re so far apart that it takes thousands of years to measure the difference without modern tools.)
If it helps, remember: in geocentrism, the earth doesn’t spin. Day and night are because the sun orbits the earth.