Note 18 — Chapter I · Earliest Stages of Astronomy.
Reading edition
Aratus says of the moon, in a passage quoted by Geminus, p. 33:
Αἴει δ’ ἄλλοθεν ἄλλα παρακλίνουσα μετωπὰ Εἴρῃ, ὁποσταίη μήνος περιτέλλεται ἡὼς As still her shifting visage changing turns, By her we count the monthly round of morns.