In this paper, we will prove, based on reasoning as well as mathematical evidence and experimental obser- vations, why Newton gravity moves at the speed of light and is not instantaneous as previously thought. The misunderstanding that Newton gravity is instantaneous has constrained our progress in understanding gravity to its full extent. We will show that all of Newton’s gravitational phenomena contain the Planck length and the speed of gravity; this speed of gravity is identical to the speed of light. A series of gravitational phenomena that are considered to be non-Newtonian and most often explained by theory of general relativity actually contain no information about the speed of gravity. However, all observable gravity phenomena can be predicted from the Planck length and the speed of gravity alone, and we can easily extract both of them from gravitational phenomena with no knowledge of any physics constants. In addition, we can also measure the speed of light from electromagnetic phenomena and then extract the Planck length from any of Newton’s gravitational phenomena with no knowledge of G or h.