Astronomy. A real or apparent motion of an oscillating kind. libration of the moon: an apparent irregularity of the moon's motion which makes it…
单词 | θ648 |
释义 | the world > the universe > planet > primary planet > moon > movement of moon > [noun] > libration (4) libration1670 Astronomy. A real or apparent motion of an oscillating kind. libration of the moon: an apparent irregularity of the moon's motion which makes it… evection1704 Astronomy. The libration of the moon, which causes a small variation in the part of the surface that is visible from the earth at any time. Cf. libr… reflection1704 Astronomy (a) An inequality in the expression for the moon's ecliptic longitude; the variation (variation, n. 7a) of the moon; (now historical)… variation1704 Astronomy. The libration of the moon; = libration, n. 2. |
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