This post (scroll down) from the Archaeology Daily News site is noteworthy in that it brings out more clearly that the knowledge behind the Antikythera Mechanism is shown to be Babylonian in origin. It has long been known (far outside ancient astronaut paleobabble sources) that the Greeks inherited and utilized Babylonian astronomical material. It is well documented in Greek sources (see Tamsyn Barton’s chapter on this in her book Ancient Astrology). Where did the Babylonians get it?  Drum roll, please . . . the naked eye.  All of this is obtainable from naked eye astronomy — conducted of course for many generations, and then extrapolated via mathematics. Nothing supernatural or extraterrestrial here. Just a lot of human dedication and patience.