When Newton calculated his gravitational constant G, he got it upside down. There are two reciprocal constants of gravity that represent cause and effect of force and motion. Newton’s imagined a downward force of gravity that caused the effect of downward gravitational velocity in falling bodies. Even though he spent his whole life feeling gravity pushing his body upward, Newton refused to believe that this real gravitational motion was the cause and not the effect of the upward force that he measured with his accelerometer.