Astronomy Answers: From the Astronomical Dictionary

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 //