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

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

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens.

To know the mighty works of God, to comprehend His wisdom and majesty and power; to appreciate, in degree, the wonderful workings of His laws, surely all this must be a pleasing and acceptable mode of worship to the Most High, to whom ignorance cannot be more grateful than knowledge.

Astronomy is written for astronomers

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.