| 单词 | crommelin's comet |
| 释义 | Crommelin's cometCrommelin's comet(kroh -mĕ-linz) An inconspicuous comet with a period of 27.7 years, first observed in 1818. Its apparition in March 1984 was observed internationally: the results were used to test techniques to be used in the observation of Halley's comet, perihelion Feb. 1986, the observing conditions for the two comets being very similar. |
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