Although it is possible to see Uranus with the unaided eye in good viewing conditions, it was never recognized by ancient peoples as a planet because it was so dim and moved so slowly.

尽管可能在一个好天气里可以看肉眼看到天王星，但是因为其亮度过暗和绕行缓慢，古代监测者并没有发现它是行星。