Ptolemy was born around 100 AD and lived in Alexandria as a geographer and astronomer, where he died around 178. With his Tetrabiblos, which means "book in four parts," Ptolemy bequeathed a timeless document of astrology to present and future generations. He reassembled the verifiable facts of experience from a causal perspective, creating a comprehensive textbook. Many of the terms and rules still valid today were derived from the Tetrabiblos. Through his clear definitions, astrology was systematically organized for the first time. Additionally, he captured all streams of astrological knowledge and shaped them into a synthesis. He is credited with establishing the zodiac as well as the interpretation of the planets. The Tetrabiblos served as the "Bible of astrologers" for 1500 years. A work of timeless relevance.