estrial 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 tegrations verg a span of ± 5 x 1010 yr the total epsed ti for all tegrations is ore than 5 yr， g several dedicated pcs and workstations one of the fundantal ncsions of our long-ter tegrations is that sor syste pary otion sees to be stableters of the hill stability ntioned above， at least over a ti-span of ± 4 gyr actually，our nurical tegrations the syste was far ore stable than what is defed by

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