Gary, There are three movments involved in the Heliocentric version, two in a geostatic one. in both case the objects will arive at the same place in space at the same time, the only difference is the origin of the movments.The differencs are made up in speed and direction that is all. Allen Gary Shelton <garylshelton@xxxxxxxxxxx> wrote: [Allen wrote:] The only difference is the "origin" of the motion not the relative speeds or directions. In geocentric mechanics all movement is by the sun and moon. In a-centric is due to the combination of the moons w-e orbit earth?s spin Counter clockwise spin and earth/ moon counter clockwise orbit around the sun. It is this "observational equivalence" that has allowed the A-centrist to get away with it. Again the only difference is the origin of the movement not the relative speeds or positions. [Gary writes:] Allen, I may not entirely understand what you are saying. The grammar in your third sentence above is a bit vague. However, if you are saying that the acentric explanation for the eastward shadow movement involves a 2300 mph counterclockwise tangential speed of the moon overcoming a 1000 mph counterclockwise rotation speed of the earth, then you are absolutely mistaken. See the link I gave you in my last post. The acentric explanation involves only the tangential motion of the moon versus the still sun. The geocentric explanation involves...well, no one knows what that involves exactly, because we don't have an explanation as of yet. Sincerely, Gary Shelton GaryLShelton@xxxxxxxxxxx