At rest, however, in the middle of everything is the sun.

The earth together with its surrounding waters must in fact have such a shape as its shadow reveals, for it eclipses the moon with the arc of a perfect circle.

Moreover, since the sun remains stationary, whatever appears as a motion of the sun is really due rather to the motion of the earth.

At rest, however, in the middle of everything is the sun.

We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface.

Not only the phenomena of the others followed from this, but also it so bound together both the order and magnitude of all the planets and the spheres and the heaven itself, that in no single part could one thing be altered without confusion among the other parts and in all the universe.

Finally we shall place the Sun himself at the center of the Universe.