The motion trajectories of planets are divided into static trajectories and dynamic trajectories. It was proposed that planets revolve around the center of mass of stars and other planets. It suggests that the center of mass of a planet, or the center of mass of an entire galaxy, is not a closed curve in the plane of the galaxy, but a solid spiral curve around that closed curve. It was proposed that the planet and its orbiting moons were a whole. It was proposed that the orbit of the planets around the star is a closed, irregular spiral curve around the center of mass of the planets and moons, around the center of mass of the stars and other planets. Similarly, the orbit of the satellite around the planet is also a circle of irregular spiral curves. The curve in the closed irregular galactic plane is static, and is the projection of the threaded center of the dynamic spiral curve onto the galactic plane. The closed irregular spiral curve is dynamic. It was proposed that the trajectory of the planets around the star was not an elliptic curve in the galactic plane, but a three-dimensional spiral curve around this irregular flat curve that resembled an ellipse. It turns out that Kepler's third law describes the dynamics of planets. In other words, Kepler's second law, which is a static description of planets, follows the area law. Kepler's third law, which describes the dynamics of planets, also follows the area law and is in perfect agreement with Newton's law of gravitation.