Imagine being on the equator (and that the Earth is a perfect sphere). Also imagine that the Earth is spinning just fast enough so that gravity is canceled out by the centripetal (or centrifugal, that's not important here) force. I have a wait of zero... no problem, right? Now what if I say that the Earth is stationary (and so am I) and that the universe is rotating around us? This is perfectly correct, isn't it? And wouldn't that mean that my weight should in fact not be zero since there is no rotation to cancel it? Thanks!