Since, then, there is no objection to the mobility of the Earth, I think it must now be considered whether several motions are appropriate for it, so that it can be regarded as one of the wandering stars. For the fact that it is not the centre of all revolutions is made clear by the apparent irregular motion of the wandering stars, and their variable distances from the Earth, which cannot be understood in a circle having the same centre as the Earth.

Finally we shall place the Sun himself at the center of the Universe. All this is suggested by the system of procession of events and the harmony of the whole Universe, if only we face the facts, as they say, "with eyes wide open."

The Universe, wrought for us by a supremely good and orderly Creator.

In so many and such important ways, then, do the planets bear witness to the earth's mobility.

Of all things visible, the highest is the heaven of the fixed stars.

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

First of all, we must note that the universe is spherical.