Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is
inclination orbits are rarely placed in retrogradeorbit. This is partly due to the extra velocity (and propellant) required to launch into orbit against
The Moon orbits Earth in the prograde direction and completes one revolution relative to the Vernal Equinox and the stars in about 27.32 days (a tropical
convention, the inclination of a Prograde orbit is specified as an angle less than 90°. Retrogradeorbit: An orbit counter to the direction of rotation of
in diameter, in a resonant, co-orbital motion with Jupiter. It is an unusual minor planet in that its orbit is retrograde, which is opposite to the direction