View source for Relative Movement

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'''Relative Movement'''
 
</dt><BR/>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><BR/>''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 [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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