单词 | Kepler's laws |
释义 | Kepler's laws [`kep·lǝrz `lȯz] ASTRONOMY Three laws, determined by Johannes Kepler, that describe the motions of planets in their orbits: the orbits of the planets are ellipses with the sun at a common focus; the line joining a planet and the sun sweeps over equal areas during equal intervals of time; the squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun. |
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