"Therefore, it is hardly a matter of surprise that there is much similarity between Indian knowledge, and knowledge that has been attributed to the early Greeks based on late Arabic texts: for example, the astronomical model attributed to “Ptolemy” is remarkably similar to Indian astronomical models, "Aristotle's" theory of action by contact, using aether (sky —àkàsa) is as similar to the Nyaya theory as his syllogisms are to Nyàya syllogisms, etc."