Definitions for "Retrograde motion"
The apparent backward motion of a planet when it appears, as observed from Earth, to reverse its natural direction of travel and move backward in the zodiac.
When a planet reverses its usual direction of travel (west to east) for a few weeks.  When the planet is traveling in the reverse direction (east to west) it is said to be retrograding.  After a few weeks the planet reverses again and resumes its normal course.
Westward or backward drift of a planet resulting from the forward motion of the earth as it passes the planet.
Keywords:  satellite
Keywords:  solar, rotation, opposite, way, system
a rotation that is the opposite way from the rotation of most of the Solar System.