>>19105989>How did Galileo see a glowing dot and go "thats another planet"? "Planet" is from a Greek word meaning "wanderer." The ancients noticed that all the stars in the skies followed set circular patterns around a single point in the sky, which is right about where Polaris (the North Star) is found. The planets however follow totally different paths, and sometimes not even in a straight line. Here is an example of Mars' retrograde motion, which occurs when the Earth's revolution around the Sun overtakes Mars.
>Protip: Flat Earth has no explanation for this movement. 