1. The sphere of the heavens is rounded and its center is the earth,
equally shut in on every side. This sphere, they say, has neither
beginning nor end, for the reason that being rounded like a circle it
is not easily perceived where it begins or where it ends.
2. The philosophers have brought in the theory of seven heavens of
the universe, that is, globes with planets moving harmoniously, and
they assert that by their circles all things are bound together, and
they think that these, being connected, and, as it were, fitted to
one another, move backward and are borne with definite motions in
contrary directions.