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tangential motion

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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.
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Origin of tangential motion

First recorded in 1760–70
Also called tangential velocity.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018