al motion of seven planets (venus to neptune)， which cover a span of ～109 yr. their experiments on the seven planets are not yet comprehensive， but it seems that the terresial planets also remain stable during the integration period， maintaining almost regular oscillations.
on the other hand， in his accurate semi-analytical secular perturbation theory (laskar 1988)， laskar finds that large and irregular variations can appear in the eccenicities and inclinations of the terresial planets， e