"For among these, the first and chief consideration is the size of the sphere of the fixed stars, which is immense, and the next is the size of the earth, which is as a point in comparison with the hea…"

"The universe is a spherical whole, and of all possible forms, the sphere is the most perfect."

"The universe is a harmonious system, and all its parts are in perfect accord."

"For the motion of the earth is a fact, and the apparent change of position of the fixed stars is due to the earth's motion and not to any motion of the stars themselves."

"For it is not the magnitude of the stars, but the magnitude of their distance from us, that causes them to appear small."