; lissauer also perford four siir experts on the orbital otion of seven ps (ven to neptune)， which ver a span of ～109 yr their experts on the seven ps are not yet prehensive， but it sees that the terrestrial ps also rea stable durg the tegration period， atag alost regur osciltions
on the other hand，his aurate sei-analytical secur perturbation theory (skar 1988)， skar fds that rge and irregur variations can appearthe eentricities and ctions of the terrestrial ps， especially of rcury and ars on a ti-scale of several 109 yr (skar 1996) the results of skar's secur perturbation theory should be nfird and vestigated by fully nurical tegrations
this paper we present preliary results of six long-ter nurical tegrations on all ne pary orbits， verg a span of several 109 yr， and of o other teg
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