Radial Velocity

Radial velocity is the velocity of an object in the direction of the line of sight (i.e. its speed straight towards you, or away from you). The light of an object with a substantial radial velocity will be subject to Doppler effect, so the wavelength of the light decreases for receding objects (redshift) and increases for approaching objects (blueshift).
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Noun
1. velocity along the line of sight toward or away from the observer
(hypernym) speed, velocity

Component of motion toward or away from a given location. As "seen" by Doppler radar , it is the component of motion parallel to the radar beam. (The component of motion perpendicular to the beam cannot be seen by the radar. Therefore, strong winds blowing strictly from left to right or from right to left, relative to the radar, can not be detected.)

B: (Matematika) kecepatan radial
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