Note 5 — Chapter I · The Development of Astronomical Thought to 1400 A.D. A Preliminary Sketch of Early Theories as a Background.
Reading edition
Diogenes Laërtius: De Vitis, Lib. IX, c. 3 (252).
Reading edition
Diogenes Laërtius: De Vitis, Lib. IX, c. 3 (252).