Deformation of the Planetary Orbits Caused by the Time Dependent   Gravitational Potential in the Universe
  In the paper are studied the deformations of the planetary orbits caused by the time dependent gravitational potential in the universe. It is shown that the orbits are not axially symmetric and the time dependent potential does not cause perihelion precession. It is found a simple formula for the change of the orbit period caused by the time dependent gravitational potential and it is tested for two binary pulsars. 
Kostadin Trencevski