1. Proclus Diadochus: Commentary of the Timaeus, IV, III, 8. 29.
2. Hesiod: The Works and Days, 609 and 663, transi. R. Lattimore, Ann Arbor 1959.
3. O. Neugebauer: The Exact Sciences in Antiquity, 2nd ed., New York 1962, p. 83.
4. Old Testament, Psalms, XXXI, 15, King James’ translation.
5. ibid., Ecclesiastes, III, 1–2.