| 单词 | mean moon |
| 释义 | > as lemmasmean moon mean moon n. Astronomy a hypothetical moon conceived as moving uniformly through the sky with the same orbital period as the actual moon. ΘΚΠ the world > the universe > planet > primary planet > moon > [noun] > mean mean moon1845 1845 Brit. Almanac of Soc. for Diffusion Useful Knowl. 1845 20 At the fifth new moon the Calendar moon is nearly 3 hours behind the mean moon. 1877 Encycl. Brit. VII. 615/1 This calendar moon is not the moon of the heavens, nor the mean moon of the astronomers. 1970 S. Chapman & R. S. Lindzen Atmospheric Tides ii. l70 By analogy with the mean solar time, a mean lunar time is introduced, determined by the motion of a fictitious mean moon, which is imagined to move uniformly round the earth. 2010 C. Wilson Hill–Brown Theory Moon’s Motion ii. 15 Certain constants of the theory—the orbital eccentricities of the Moon and the Sun,..the ratio of the Sun's and Moon's mean motions, the ratio of the mean Moon-Earth and Sun-Earth distances. < as lemmas |
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