VSOP87 is a planetary theory built by P. Bretagnon and G. Francou in the Bureau des Longitudes. With this theory, they produced data files, which have been used in JEphem to compute the coordinates of the planets, from Mercury to Neptune. ...
6: The VSOP87 theory uses an old, outmoded astronomical coordinate system. Today we use the new ICRF3 (International Celestial Reference Frame) as the newest standard for celestial coordinates since 2019-Jan-01-Tue, so VSOP87 positions will differ slightly from positions computed by other ...
Bureau des Longitudes, CNRS URA 707 77, Avenue Denfert-Rochereau 75014, Paris, France Tel : (33) 1 40 51 22 69 (33) 1 40 51 22 60 Fax : (33) 1 46 33 28 34 E-mail : pierre@bdl.fr francou@bdl.fr Contents: The main version of VSOP87 is similar to the previous theory VSOP...