http://www.crystalinks.com/galileo.html
http://csep10.phys.utk.edu/astr161/lect/retrograde/copernican.html
http://plato.stanford.edu/entries/copernicus/
http://www.lairweb.org.nz/leonardo/
Quantum Years 100 Scientist Who Changed the World, Jon Balchin, 2003 pp.36-39, 46-47
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