that enclose the body on its six sides. The directions constituted by the body’s own surfaces do not constitute a place for the body itself at all. The surfaces of the body enclosing it, however, constitute its place, such as the surfaces of the air surrounding a person. Likewise, the surfaces of the celestial sphere enclosing the surfaces of the air constitute a place for the air. Some of these spheres enclose others and constitute their places.

As for the surface of the outermost sphere, it has been demonstrated that no body exists beyond it. Were that the case, there would necessarily be beyond [this body another body, and so on without end. Thus, the surface of the outermost body in] the world is not a place at all, since no body can exist there, whereas a body can exist in anything that is a place. Thus,