Astronomy and astrology...ancient semantics

Abstract:

The modern usage of the words astronomy and astrology is traced back to distinctions, largely ignored in recent scholarship. Three interpretations of celestial phenomena (in a geometrical, a substantialist and a prognostic form) coexisted during the Hellenistic period. From Plato to Isidore of Seville, semantic changes are evidenced and their later development is sketched.

"‘Astronomy’ or ‘Astrology’: A brief history of an apparent confusion" by A.Losev