Note 636 — SECOND PART. The Astronomy of Dante. (continued 4)
Reading edition
“Orbis” and “sphæra” are used indifferently by Alfraganus to indicate the celestial spheres: thus, in ch. xii. he says “Orbes, qui stellarum omnes motus complectantur, numero esse octo,” and on the next page, “unamquamque harum sphærarum octo.”