Why do the planets have no apparent effect on Earth, but an effect on the Sun and Moon?
All the planets are pulling one another. I can assure you they do have an effect on the Earth. In the short term, the Earth never follows exactly the same path round the Sun each orbit, but is displaced by a small amount from its mean orbit by the pull of the planets. In the long term, the shape and orientation of the Earth’s orbit is affected and, over the centuries, it gradually twists round and its eccentricity changes as a result of the pull of the other planets.
