If everything in the universe accelerated equally, truly nothing would be accelerating at all. We would all float away endlessly. Thus, we are given to the fact that everything on the earth is not universally accelerated. Only the lower earth and the celestial bodies receive the force directly. All other bodies on earth are then given the acceleration by, for example, the ground, or air. This leads us to some strange phenomenon, such as atmolayer thinning and clouds. Both of these events are actually due to Celestial Gravitation.