| 单词 | radial velocity |
| 释义 | > as lemmasradial velocity radial velocity n. velocity in a radial direction; (Astronomy) the velocity of a star or other celestial object along the line of sight of an observer. ΘΚΠ the world > the universe > star > stellar motion > [noun] > velocity radial velocity1870 space velocity1909 1870 Rep. U.S. Commissioners Paris Universal Expos. 1867 118 The cylindrical section of the interior of the wheel should be enlarged relatively to that of the circumference, to correspond to the diminution of radial velocity which takes place toward the openings for discharge. 1876 Proc. Amer. Philos. Soc. 1874–5 14 657 The combined influences of Jupiter and Earth over the asteroidal belt..; the tendency of their mean radial velocities..and the limiting satellite velocities, to equality; [etc.]. 1933 A. S. Eddington Expanding Universe i. 9 If a spiral nebula is not too faint it is possible to measure its radial velocity in the line of sight by measuring the shift of the lines in its spectrum. 1995 K. Croswell Alchemy of Heavens (1996) iv. 37 To obtain the radial velocity, an astronomer need not know anything about the star's distance. < as lemmas |
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