Kepler Newton and Einstein

How well do Newton’s and Einstein’s theories explain Kepler’s observations of planetary orbits? Do Newton’s laws of motion apply in Newton’s gravitation? Are Kepler’s Newton’s and Einstein’s laws universal? Does Einstein's theory replace Newton's theory?
Newton’s laws of motion and gravitation admit fictional centrifugal forces in angular motions and, with such fictional forces, Newton’s law of gravitation acting radially predicts all types of conical orbits including Kepler’s laws. The idea...