单词 | radius vector |
释义 | radius vectornoun 1 Mathematics A line of variable length drawn from a fixed origin to a curve.When Archimedes defines a spiral, he gives fundamental properties connecting the length of the radius vector with the angles through which it has revolved....
1.1 Astronomy A line of variable length joining a satellite or other celestial object to its primary.In the second law, Kepler used the idea of radius vector, and stated that the radius vector from the sun to a planet sweeps out equal areas in equal intervals of time....
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