Philosopher who divided the "Laws" of Plato into 12 books; for he himself is said to have added the 13th. And he was a pupil of Socrates and of Plato himself, occupied with the study of the heavens. Living in the time of Philip of Macedon, he wrote the following: "On the distance of the sun and moon"; "On gods"; "On time"; "On myths"; "On freedom"; "On anger"; "On reciprocation"; "On the Opuntian Lokrians"; "On pleasure"; "On passion"; "On friends and friendship"; "On writing"; "On Plato"; "On eclipse(s) of the moon"; "On the size of the sun and moon and earth"; "On lightning"; "On the planets"; "Arithmetic"; "On prolific numbers"; "Optics"; "Enoptics"; "Kykliaka"; "Means"; etc.