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Definition of
proper motion
- 1 dictionary result
Oz - The Wizard of Moving
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proper motion
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–noun
Astronomy
.
the angular motion of a star relative to a suitably defined frame of reference, expressed in seconds of arc per year.
Compare
tangential motion
.
Origin:
1595–1605
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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