Mercury retrograde, explained WITHOUT astrologyby Vox 2 years ago
The science buried under the pseudoscience.
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Mars photography by Tunç Tezel: http://www.twanight.org/newtwan/galleries.asp?Sort=Photographer&Value=Tunc%20Tezel&page=1
Mars visualization from Nooch 86: https://www.youtube.com/watch?v=TK9ozJYELR8
Solar system orbits via Michael Van Daniker, Andrew Lund, and the Astronomy Workshop of Douglas Hamilton at U. Maryland http://janus.astro.umd.edu/SolarSystems/
Ptolemaic system vsualizer via Nebraka Astronomy Applet Project: http://astro.unl.edu/naap/ssm/animations/ptolemaic.html
Retrograde motion visualizer via MHeducation: http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::800::600::/sites/dl/free/0072482621/78780/Retro_Nav.swf::Retrograde%20Motion
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