Astronomy Answers
From the Astronomical Dictionary


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the VSOP model

From the VSOP model (Variations S├ęculaires des Orbites Plan├ętaires) of P. Bretagnon and G. Francou, the positions of the planets can be calculated very accurately for a few thousand years into the past and into the future. This model is available for free. See http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1988A%26A...202..309B&db_key=AST&data_type=HTML.