A quick render of an animation of the retrograde motion of Mars. I captured screenshots of the opposition in 2018 (chosen because there was a minimum of other planetary crossings in the field of view) rendered in the excellent (free) program Stellarium and then used the amazing (free) 3D modeling and rendering software Blender to composite the separate frames into an animation. It's captured in standard HD (1280x720) so it should be viewable on the YouTube site with much better resolution than the above.
Really, just testing the method here --- now I know how I can use these packages for many other illustrations and movies I'd like to do.
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