In the previous chapters, we covered the History of Astrology up to the Hellenistic period, following the iter that led to the birth of Astrology as it’s nowadays known and practiced. A great deal of this “elaboration” is mostly Claudius Ptolemy’s merit. Ptolemy (c. AD 90 – c. AD 168), author of the famous opus Tetrabiblos (‘four books’), was a Greco-Egyptian writer of Alexandria, known as a mathematician, astronomer, geographer, and also astrologer. He lived in the city of Alexandria in the Roman province of Egypt, wrote in Greek, and held Roman citizenship. He viewed Astrology as a theoretical science, by means of which it’s possible to explain the interconnections between celestial and terrestrial phenomena and to trace the cause-effect relationships between the stars and the earth.
Ptolemy’s theoretical approach to astrology was in sharp contrast to the approaches of his Astrologic peers: he wrote about basic physical principles from which all phenomena can be derived, the four humors, heat, cold, moist, dry, the favorable or unfavorable aspects, the angular relationships or aspects like conjunction, sextile, square, trine, opposition.