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tangential motion

noun, Astronomy.
1.
the component of the linear motion of a star with respect to the sun, measured along a line perpendicular to its line of sight and expressed in miles or kilometers per second.
Also called tangential velocity.
Origin of tangential motion
1760-1770
First recorded in 1760-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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