The angular velocity of the revolution of the planets around the sun increases and this can be explained using Kepler’s second law. It is observed that as the planet gets closer to the sun, the planets move faster because the gravitational pull from the sun get stronger.
Also, the moment of inertia about the axis decreases for all the planets. Angular velocity increases to conserve angular momentum. Moment of inertia of the earth about an axis through the sun keeps on changing due to change in its distance from the sun