For over a thousand years, the Tetrabiblos held an authority in the astrological world comparable to that of a bible.
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 Ptolemy's Tetrabiblos, Or Quadripartite
Ptolemy systematically organized the astrological knowledge of his time into four distinct sections: For over a thousand years, the Tetrabiblos held
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. For over a thousand years