The Library · Hellenistic tradition
A chapter of Tetrabiblos by Claudius Ptolemy, c. 150 CE.
The cornerstone of Western astrology. Ptolemy's four-book treatise codifies the doctrine of planets, signs, houses, and aspects from the Greco-Roman tradition.
The full chapter text renders in the interactive Library reader, with the engine's cited rules linked to the passages they derive from.
The whole book · The rule book · The Library