Proper Motion Definition

noun
A gradual change in the position of a star or other object on the celestial sphere that is the result of the object's intrinsic motion through space rather than mere apparent motion as observed from Earth.
American Heritage

Other Word Forms of Proper Motion

Noun

Singular:
proper motion
Plural:
proper motions

Proper Motion Sentence Examples

  • His most interesting paper is "On the Proper Motion of the Solar System," and was published in the Phil.

  • If these suppositions have a basis of reality, the proper motion of Algol should be disturbed by a small, but measurable undulation, corresponding to the projection of its orbit upon the sky; and although certainty on the point cannot be attained for some years to come, Lewis Boss regarded the evidence available in 1895 as tending to confirm Dr Chandler's theory.6 Proceedings Amer.

  • He made a great number of observations of stars with proper motion.

  • No correction for any defect in it has been found necessary; moreover, no rotation of the base relative to the directions of the stars without proper motion has been detected.

  • In many other double stars the two components have very nearly the same proper motion.

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Words Starting With

PPRPRO

Words Ending With

NONION

Unscrambles

proper motion

Words Starting With P and Ending With N

Starts With P & Ends With NStarts With PR & Ends With NStarts With P & Ends With ON

Word Length

13 Letter Words13 Letter Words Starting With P13 Letter Words Ending With N