![When you plot the position of Mars in the sky, you’ll notice that in general it moves from West to East. But when we are closest to Mars, it seems to go backwards for a bit before continuing. This is called retrograde motion, and this challenged early models of the Solar system which had Earth at the centre. The animation shows why Mars appears to go backwards for a bit. [more] [code]](http://25.media.tumblr.com/tumblr_lld3ozwD5f1qfg7o3o1_400.gif)
When you plot the position of Mars in the sky, you’ll notice that in general it moves from West to East. But when we are closest to Mars, it seems to go backwards for a bit before continuing. This is called retrograde motion, and this challenged early models of the Solar system which had Earth at the centre. The animation shows why Mars appears to go backwards for a bit. [more] [code]
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