Ptolemy's Tetrabiblos, | Or Quadripartite

He viewed astrology as a practical science similar to medicine—conjectural rather than absolute—because individual results could be modified by factors like race, upbringing, and geographical location. Historical Legacy

For over a thousand years, the Tetrabiblos held an authority in the astrological world comparable to that of a bible. Ptolemy's Tetrabiblos, Or Quadripartite

Unlike his predecessors, Ptolemy attempted to ground astrology in the of his time. He used Aristotle’s concept of the four elements and the four humors to explain how the "emanations" of the planets physically affected the Earth's atmosphere and, by extension, human bodies. He viewed astrology as a practical science similar