VSOP
VSOP
The semi-analytic planetary theory VSOP was developed and is maintained by the scientists at the Bureau des Longitudes in Paris, France. The first version, VSOP82, computed only the orbital elements at any moment. An updated version, VSOP87, besides providing improved accuracy, computed the positions of the planets directly, as well as their orbital elements, at any moment.The above text is a snippet from Wikipedia: VSOP (planets)
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