The Mechanics of Laplace - Translated With Notes and Additions #246081

I. A Bony appears to us to be in motion when it changes its situation relative to a system of bodies which we suppose to be at rest: but as all bodies, even those which seem to be in a state of the most absolute rest, may be In motion; we conceive a space, bound less, immoveable, and penetrable to matter. It 18 to the parts oi this real or idea] space that we by imagination refer the situation of bodies and we conceive them to be 111. Motion when they answer successively to different: parts of space.