 1613 - Letter to Benedetto Castelli discussing the rotation of the sun and Galileo 's support of the Copernican system . Using Biblical inerrancy as a basis , Galileo writes that Joshua 's command for the sun to stand still in Joshua 10 : 13 proves the " impossibility of the Aristotelian and Ptolemaic world system , and on the other hand agrees very well with the Copernican one . " He went on to write that " the sun gives not only light ( as it obviously does ) but also motion to all the planets that revolve around it " by its rotation . 
