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radial motion

noun, Astronomy
the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in the wavelength of light emitted by the star.
Also called radial velocity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for radial motion
  • The simplest explanation for such radial motion is that a companion tugs at the star.
  • Interface must lock the coils azimuthally, maintain the coils co-axial, and allow relative radial motion with low friction.

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