celestial mechanics

noun
the branch of astronomy that deals with the application of the laws of dynamics and Newton's law of gravitation to the motions of heavenly bodies.

Origin:
1815–25

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Collins
World English Dictionary
celestial mechanics
 
n
the study of the motion of celestial bodies under the influence of gravitational fields

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
celestial mechanics  
The science of the motion of celestial bodies under the influence of gravitational forces. See more at Kepler's laws of planetary motion, relativity.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
So, celestial mechanics has given us this one time only possibility.
Astronomers usually specialize in a branch of astronomy such as astrophysics, celestial mechanics, or radio astronomy.
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