What is Mercury Retrograde? Myths on Astrology Retrograding

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Retrograde motion is motion in the direction opposite to the movement of something else, and is the contrary of direct or prograde motion. This motion can be the orbit of one body about another body or about some other point, or the rotation of a single body about its axis, or other phenomena such as precession or nutation of the axis. In reference to celestial systems, retrograde motion usually means motion which is contrary to the rotation of the primary, that is, the object which forms the system's hub. When a galaxy or a planetary system forms, its material takes the shape of a disk. Most of the material orbits and rotates in one direction. This uniformity of motion is due to the collapse of a gas cloud.[1] The nature of the collapse is explained by the principle called conservation of angular momentum. In 2010 the discovery of several hot jupiters with backward orbits called into question the theories about the formation of planetary systems.[2] This can be explained by noting that stars and their planets do not form in isolation but in star clusters and when the protoplanetary disk from one star collides or steals material from another star's disk this can result in retrograde motion of a disk and the resulting planets.[3][4]
[edit] Orbital parameters