Astrology, then, was religious in its origin and in its principles. It was religious also in its close relation to the Oriental religions, especially those of the Syrian Baals and of Mithra; finally, it was religious in the effects that it produced. I do not mean the effects expected from a constellation in any particular instance: as for example the power to evoke the gods that were subject to their domination.[31] But I have in mind the general influence those doctrines exercised upon Roman paganism.
When the Olympian gods were incorporated among the stars, when Saturn and Jupiter became planets and { 175} the celestial virgin a sign of the zodiac, they assumed a character very different from the one they had originally possessed. It has been shown[32] how, in Syria, the idea of an infinite repetition of cycles of years according to which the celestial revolutions took place, led to the conception of divine eternity, how the theory of a fatal domination of the stars over the earth brought about that of the omnipotence of the "lord of the heavens," and how the introduction of a universal religion was the necessary result of the belief that the stars exerted an influence upon the peoples of every climate. The logic of all these consequences of the principles of astrology was plain to the Latin as well as to the Semitic races, and caused a rapid transformation of the ancient idolatry. As in Syria, the sun, which the astrologers called the leader of the planetary choir, "who is established as king and leader of the whole world,"[33] necessarily became the highest power of the Roman pantheon.
Astrology also modified theology, by introducing into this pantheon a great number of new gods, some of whom were singularly abstract. Thereafter man worshiped the constellations of the firmament, particularly the twelve signs of the zodiac, every one of which had its mythologic legend; the sky (_Caelus_) itself, because it was considered the first cause, and was sometimes confused with the supreme being; the four elements, the antithesis and perpetual transmutations of which produced all tangible phenomena, and which were often symbolized by a group of animals ready to devour each other;[34] finally, time and its subdivisions.[35]