【Shi Jou】評論

為什麼所有的行星似乎並沒有在同一個方向移動？（A）太陽不動。（B）所有行星側身移動。（C）地球是運動的。（D）所有行星向後移動。

【Scorpiogirl】評論

It is easy to understand why the Greeks found geocentric cosmology so appealing. Night after night, we see celestial objects moving across the sky from east to west. Wouldn’t it be natural to assume that the Earth lies motionless at the center of the universe and that the Sun, the moon, planets, and stars revolve around it? In the 4th century B.C., Plato postulated a world system with the stationary Earth as its hub and a huge outer space that carried the planets and stars in its daily revolution. But his two-sphere configuration could not account for a particular motion of certain planets. A...