Originally Posted By: Bill S.

going from A to B, it must be at B at the same time that it leaves A.

Now suppose that between A and B it passes through the Earth’s atmosphere which slows it down slightly, so it


If it slows down on the way then it can no longer be at A and B at the same time.

Or are you saying, when it starts out it 'thinks' it's already at B because it doesn't see the Earth in the way. Then somebody puts Earth in its path, so suddenly it has to not be at B anymore.