Logicus to David Wilson David thanks for this useful advice re the request quote tag but I do not understand your analysis here and it seems to me you may have confused the de Soto citation case with the Jovian moons citation case Another dog s breakfast maybe The good reason to doubt the de Soto free fall claim was Grant s claim that he predicted uniform acceleration in a homogeneous medium The good reason to suspect the Jovian moons case was simply that it is nonsense They only support epicyclical astronomy in general whether geocentric or heliocentric Elementary my dear Wilson However I do note from your quotations provided elsewhere in Talk Galileo Galilei that Drake did indeed make this silly logical error one of the many that render his conclusions about Galileo utterly unreliable