Relative Movement
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Relative Movement
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Motion of one object or body measured relative to another. Usually called
apparent motion when applied to the change of position of a celestial
body as observed from the earth. Also called relative motion.
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The expression is usually used in connection with problems involving
motion of one craft or vehicle relative to another, the direction of such
motion being called direction of relative movement and the speed of such motion
being called speed of relative movement or relative speed. Distance relative
to a specified reference point, usually one in motion, is called relative
distance.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use