Definition of radial velocity
1
: the component of velocity of a particle in the direction of its radius vector
2
or radial motion
: the velocity of relative approach or recession of an observer and a celestial body or other sources of radiation in the line connecting the two : speed in the line of sight
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“Radial velocity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radial%20velocity. Accessed 7 Mar. 2021.
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