| 单词 | perturbation |
| 释义 | perturbation A departure by a celestial body from the trajectory or orbit it would follow if it moved only under the influence of a single central force. According to Kepler's law, for example, a single planet orbiting the sun would move in an elliptical orbit. In fact, planets are perturbed from elliptical orbits by the gravitational forces exerted on them by other planets. Similarly, the moon's orbit round the earth is perturbed by the gravitational effect of the sun and the trajectories of comets are perturbed when they pass close to planets |
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