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. </dd>
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. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use