velocity in a radial direction; (Astronomy) the velocity of a star or other celestial object along the line of sight of an observer.
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| 单词 | θ768 |
| 释义 | the world > the universe > star > stellar motion > [noun] > velocity (2) radial velocity1870 velocity in a radial direction; (Astronomy) the velocity of a star or other celestial object along the line of sight of an observer. space velocity1909 the velocity in space relative to the sun of a star or other object outside the solar system, equal to the vector sum of the proper motion of the… |
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