The magnitude of G is the same as the magnitude of the force between two masses of 1 kilogram each, I meter apart: 0.0000000000667. Where does 0.0000000000667 come from? G is an acclerlation rate. The experiments in my text from Henry Cavendish and Philip von Jolly. Both experients seem to only show a displacement rather than the time the displacment occurs. Wouldn't they have to know in the experiment the time the displacement occurs to get the constant G? If they didn't test for the time, how did they get it from the experiment?