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== External links == * {{APOD |date=13 June 2010 |title=Composite photograph of the 2009/2010 retrograde motion of Mars}} * [http://alienworlds.southwales.ac.uk/retrogradeOrbits.html Animated explanation of the mechanics of a retrograde orbit of a planet] {{Webarchive|url=https://web.archive.org/web/20131005143328/http://alienworlds.southwales.ac.uk/retrogradeOrbits.html |date=2013-10-05 }}, [[University of South Wales]] * [https://web.archive.org/web/20130416070621/http://mars.jpl.nasa.gov/allaboutmars/nightsky/nightsky04/ NASA: Mars retrograde motion] * [https://www.youtube.com/watch?v=nPprOO2u1gk Double sunrises, 3DS Max Animation] β illustrating the case of Mercury (the animation of an imaginary apparent retrograde motion of the Sun as seen from Earth begins at 1:35) * [http://shadowandsubstance.com/#mars2018 Mars Looping β The Retrograde Motion of Mars β 2018] {{Portal bar|Astronomy|Stars|Spaceflight|Outer space|Solar System}} [[Category:Astrodynamics]] [[Category:Dynamics of the Solar System]]
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