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.

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Words nearby radial motion

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Compare redshift, tangential motion.

Also called radial velocity.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019