Somehow I had never heard of the Pentagram of Venus before reading about it in an excellent Azimuth post by John Baez:[br][url]http://johncarlosbaez.wordpress.com/2014/01/04/the-pentagram-of-venus/[/url][br][br]Of course I wanted to make it in GeoGebra, and of course I wanted to generalize it. The view checkboxes let you switch your reference frame, the settings let you quickly compare Venus-Earth and Earth-Mars, or switch to aany possibility in the Settings. Necessary planetary info can be found at:[br][url]http://www.telescope.org/nuffield/pas/solar/solar7.html[/url]

More GeoGebra at [url]mathhombre.blogspot.com[/url].

[b]THE PLANETS[/b][br]Planet Distance Mass Time for 1 [br] from of Planet Orbit [br] Sun (x10 ^22 kg) of Sun[br] (million km) (days) [br] [br]Mercury 58 33.0 88.0 [br][br]Venus 108 487 224.7 [br][br]Earth 150 598 365.2 [br][br]Mars 228 64.2 687.0 [br][br]Jupiter 778 190,000 4332 [br][br]Saturn 1,429 56,900 10760 [br] [br]Uranus 2,871 8,690 30700 [br][br]Neptune 4,504 10,280 60200 [br][br]Pluto 5,913 1.49 90600