Nicolaus Copernicus Mobility Quotations

Therefore, having obtained the opportunity from these sources, I too began to consider the mobility of the earth.

In the first book I shall describe all the positions of the spheres, along with the motions which I attribute to the Earth, so that the book will contain as it were the general structure of the universe. In the remaining books I relate the motions of the remaining stars, and all the spheres, to the mobility of the Earth, so that it can be thence established how far the motions and appearances of the remaining stars and spheres can be saved, if they are referred to the motions of the Earth.

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