velocity along the line of sight toward or away from the observer
motion of a star toward or away from the earth.
Radial velocity is the velocity of an object in the direction of the line of sight. In astronomy, radial velocity most commonly refers to the spectroscopic radial velocity. The spectroscopic radial velocity is the radial component of the velocity of the source at emission and the observer at observation, as determined by spectroscopy. Astrometric radial velocity is the radial velocity as determined by astrometric observations.
The numerical value of radial velocity in Chaldean Numerology is: 6
The numerical value of radial velocity in Pythagorean Numerology is: 3
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"radial velocity." Definitions.net. STANDS4 LLC, 2017. Web. 13 Dec. 2017. <http://www.definitions.net/definition/radial velocity>.