“Ancient astrology was rather different from the modern
horoscope. Its more learned practitioners enjoyed intellectual respectability, and there was a substantial overlap between astrology and philosophy. People would consult astrologers on anything, from the time and manner in which they were going to die to who was likely to win in the chariot-races that afternoon.
The chronology of the origins and development of astrology are impossible to establish, and were debated even in the ancient world. Suffice it to say here that the Western tradition was one of many traditions: Indian, Chinese, Middle Eastern. It was Ptolemy, the Hellenistic geographer and astrologer, who first laid the technical foundations of Western astrology in his Tetrabiblos
(‘Four Books’). But the rise in the prominence of astrology was closely tied to the Roman imperial regime. It greatly benefited emperors to have their sovereignty ‘written in the stars’.”