Xanthoptica
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NvN
edit[1] nice, thanks. Pete.Hurd (talk) 17:51, 17 March 2008 (UTC)
Retrograde motion in Copernican model of solar system
editJust to let you know, I have requested a citation for your addition to the article on Copernican heliocentrism that the explanation of retrograde motion was an important attraction of heliocentrism. Rjm at sleepers (talk) 07:25, 14 October 2009 (UTC)