Therefore, the earth, which cannot be the center, cannot be devoid of all motion. Indeed, it is even necessary that the earth be moved in such way that it could be moved infinitely less. Therefore, just as the earth is not the center of the world, so the sphere of fixed stars is not its circumference—although when we compare the earth with the sky, the former seems to be nearer to the center, and the latter nearer to the circumference. Therefore, the earth is not the center either of the eighth sphere or of any other sphere. Moreover, the appearance of the six constellations above the horizon does not establish that the earth is at the center of the eighth sphere. For even if the earth were at a distance from the center but were on the axis passing through the [sphere's] poles, so that one side [of the earth] were raised toward the one pole and the other side were lowered toward the other pole, then it is evident that only half the sphere would be visible to men, who would be as distant from the poles as the horizon is extended. Moreover, it is no less false that the center of the world is within the earth than that it is outside the earth; nor does the earth or any other sphere even have a center.
Nicolaus Cusanus Nicholas of Cusa 所以汉译 库萨的尼古拉