Tetrabiblos

More about the book

Ptolemaeus, born around 100 AD and living in Alexandria until his death around 178, left behind a timeless document of astrology with his work Tetrabiblos, meaning "Book in Four Parts." He restructured observable facts under causal perspectives, creating a comprehensive textbook. Many terms and rules still in use today are derived from Tetrabiblos. For the first time, astrology was systematized through clear definitions, and Ptolemaeus synthesized all strands of astrological knowledge. He established the foundations of the zodiac and the interpretation of planets. For 1500 years, Tetrabiblos served as the "Bible of Astrologers," a work of enduring significance. Ptolemaeus succeeded in creating a unified, human-centered interpretative framework from the complexities of contemporary astrological rules, a feat unmatched by subsequent astrologers. Those who followed him consistently referenced his work, making the "four golden books" essential reading for astrologers even at the end of the 20th century.