5. Glossary
Keplerian; Keplerian
Relating to the motion obtained in the two-body problem.
Osculateur; osculating
Relating to the orbit that would be followed under Keplerian assumptions.
Precession; precession
Rotation of the orbital plane in relation to the polar axis (nodal precession) or of the orbit in its plane (apsidal precession).
Disturbance; disturbance
A force other than central attraction that deviates from the Keplerian trajectory.
Harmoniques sphériques ; spherical harmonics
Gravitational potential development terms as a power of distance.
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Website
Jet Propulsion Laboratory (JPL) ephemeris ftp://ssd.jpl.nasa.gov/pub/eph/planets/
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