Tetrabiblos

Common card · No. 451173

Tetrabiblos (Greek: Τετράβιβλος, lit. 'Four books'), also known as Apotelesmatiká (Greek: Ἀποτελεσματικά, lit. 'On the effects') and in Latin as Quadripartitum (lit. 'Four Parts'), is a text on the philosophy and practice of astrology, written by the Alexandrian scholar Claudius Ptolemy in Koine Greek during the 2nd century CE (c. 90 CE – 168 CE). Ptolemy's Almagest was an authoritative text on astronomy for more than a thousand years, and the Tetrabiblos, its companion volume, was equally influential in astrology, the study of the effects of astronomical cycles on earthly matters. But whilst the Almagest as an astronomical authority was superseded by acceptance of the heliocentric model of the Solar System, the Tetrabiblos remains an important theoretical work for astrology. Besides outlining the techniques of astrological practice, Ptolemy's philosophical defense of the subject as a natural, beneficial study helped secure theological tolerance towards astrology in Western Europe during...

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