We are taught all this [the motion of the earth on its axis and around the sun] by the order of succession, in which those phenomena (various planetary happenings) follow each other, and by the harmony of the world, if we will only, as the saying goes, look at the matter with both eyes.

Book 1, Ch. 9 as quoted by Edwin Arthur Burtt in The Metaphysical Foundations of Modern Physical Science (1925) - De revolutionibus orbium coelestium (1543)