Well, nothing is as difficult as modelling the 3-body problem numerically. Let alone, if you want to model the whole solar system. I see only the two planets, where are Jupiter and Saturn? Did you use a good timestep for your numerical integration? Did you use a correct numerical integrator? etc. etc.

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善數, 不用籌策 (shàn shù, bù yòng chóu cè)
He who is good at counting, uses no counting tools
“A good scientist has freed himself of concepts and keeps his mind open to what is”
道德經, 二十七 (dào dé jīng, 27)