The first mover, the outermost, or tenth sphere of the ancients, which in its daily motion carried all of the fixed stars. It is purely a Ptolemaic concept, exploded in theory by the Copernican concept of a solar system revolving about the Sun instead of the Earth. From the standpoint of Astrology, which deals with the effect of those apparent motions around the Earth by virtue of the Earth's own motion, the concept is as valid today as it was in Ptolemy's time.
ASTROLABE ENCYCLOPEDIA
