90
“In all these orbits motion different shalt see; in these ’tis swift, in those ’tis slow; now fly they farthest from the firmament, then sweep they nearest earth that lurks below; even so willed the Sire Omnipotent, who made the Fire and Air, the Wind and Snow: These lie more inward, as thou shalt be shown, and Earth with Ocean for their centre own.