Ancient astrology developed in Egypt and the surrounding Mediterranean area after the Alexandrian conquest and through the Roman period from the Hellenistic period (300 B.C.E. to about 600 C.E.). It is the primary source for all later Western astrology. To ancient astrologers, the planets represented the will of the gods and their direct influence upon human affairs.

How exactly the planets manifest themselves also depends on the aspects (or angles) that they form with each other in the sky as seen from Earth. A number of prominent astrologers have created Project Hindsight, an organization that has taken on the task of translating the ancient texts of this period and reconstructing the astrology of the Hellenistic era bringing a new richness to modern Western Astrology with ancient astrology techniques.