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line-of-sight velocity

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The component of a celestial body's velocity along the line of sight of the observer. It is usually given in relation to the sun to avoid complications arising from the earth's orbital motion. Line-of-sight velocity is normally calculated from the Doppler effect on the body's spectrum, a redshift indicating a receding body (taken as a positive velocity) and a blueshift indicating an approaching body (taken as negative).

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