Fig5 The density of gravitational waves caused by the revolution of the sun is different in different spatial locations. Therefore, in my theory, the eccentricity is a very important factor. The smaller the eccentricity, the closer the orbit is to a circle, the more susceptible the orbit is to external interference, and the more likely it is to precess. Venus is an example. In my theory, the greater the angle between the planet's orbit and the vertical plane of the sun's speed (the red line in the figure), the more likely the planet's orbit to precess. My theory is based on the influence of gravitational waves on gravity. A simple analogy is that the gravitational field is like the ocean, the sun is like a ship, and the gravitational waves are like waves caused by the ship. However, GR does not consider the angle between the orbital surfaces at all, and the eccentricity (1-e*e) is not the main influencing factor.