The retrograde motion of Mars

Mars retrograde 2016

About every 26 months, Earth comes up from behind and overtakes Mars. While we’re passing by the Red Planet during the next few months, it will look to us as though Mars is moving ’up and down’. Then, as we move farther along our curved orbit and see the planet from a different angle, this phenomenon will disappear and we will once again see Mars move in a straight line. This apparent erratic movement is called ’retrograde motion’

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