The centripetal force of the circular motion of celestial bodies is provided by gravity, and the motion of celestial bodies is solved according to Newton's second law, that is, GMM/R 2 = Ma, where a = V 2/R = W 2r = (2pi/t) 2r. This set of formulas can be called "celestial body" formula. It can be called "human" formula by using the gravitational force of celestial surface objects equal to universal gravitation, that is, GMM/R 2 = mg. Together, it is the so-called "heaven and earth" formula.