planets differ little between the initial and final part of each numerical integration， which spans several gyr. the solid lines denoting the present orbits of the planets lie almost within the swarm of dots even in the final part of integrations (b) and (d). this indicates that throughout the entire integration period the almost regular variations of planetary orbital motion remain nearly the same as they are at present.
vertical view of the four inner planetary orbits (from the z -axis direction) at the initial and final parts of the integrationsn±1. the axes units are au. the xy -plane is set to the invariant plane of solar system total angul
对火星轨道变化问题的最后解释(23/49)