Note 641 — SECOND PART. The Astronomy of Dante. (continued 4)

Ristoro also defines apogee and perigee (“auge” and “opposito d’auge”) as effects of movements on an epicycle, and says that the deferent is “declined” from the ecliptic (“declinato della via del sole,”) part being north and part south, but he does not say whether its perigee is north or south. Comp. del Mondo. I. xii. xiv., and III. vii.