The fact that the Earth is moving suggest that these objects should never appear in the same position. We observed both Saturn and Jupiter in our planetary studies. What they did not understand was that the planets were not moving stars, but objects reflecting light from the stars. Planets are constantly being discovered around stars throughout our visible galaxy orbiting around newly discovered stars. It has been theorized that most stars do have bodies of mass orbiting around them.
Many factors determine the brightness of objects seen in space.
The closest and biggest object in the night sky was the moon. Ptolemy assumed that the Earth was at the center of the universe, with all object in space revolving in circular orbits around it as Aristotle theorized. He also understood these objects to be orbiting at a constant rate. However, due to some discrepancies regarding the movement of the planets, he modified this understanding somewhat. In order to make sense of the planetary movements, Ptolemy moved the Earth from the center of the universe, and proposed that the planets had orbits within their orbits, called epicycles.