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From Wikipedia, the free encyclopedia. Diurnal motion (Latin diurnus â²dailyâ², from dies â²dayâ²) is an astronomical term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles.
Retrograde motion is motion in the direction opposite to the movement of something else and 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 that is contrary to the rotation of the primary, that is, the object that forms the system's hub.