Exhibit 1: Philosophiae Naturalis Principia Mathematica, 5 July 1687:
Thus,
F @ apogee = (6.67 x 10^-11 m^3 kg^-1 s^-2)(5.97 x 10^24)(7.36 x 10^22)kg/405948km;
F @ perigee = (6.67 x 10^-11 m^3 kg^-1 s^-2)(5.97 x 10^24)(7.36 x 10^22)kg/359861km
Somebody else can do the math...