Retrograde motion of Mars - Photographing Mars at the same time every night, it appears to be moving in a peculiar way with respect to the distant stars, sometimes seemingly moving backwards. This is called retrograde motion and proves that the Earth is N

Retrograde motion of Mars - Photographing Mars at the same time every night, it appears to be moving in a peculiar way with respect to the distant stars, sometimes seemingly moving backwards. This is called retrograde motion and proves that the Earth is N