libration
11libration — librational, adj. /luy bray sheuhn/, n. Astron. a real or apparent oscillatory motion, esp. of the moon. [1595 1605; < L libration (s. of libratio) a balancing. See LIBRATE, ION] * * * ▪ astronomy in astronomy, an oscillation, apparent or… …
12libration — noun Etymology: Latin libration , libratio, from librare to balance, from libra scales Date: 1667 an oscillation in the apparent aspect of a secondary body (as a planet or a satellite) as seen from the primary object around which it revolves •… …
13libration — (li bra sion) s. f. 1° Terme de physique. Balancement régulier, tel que celui d un pendule, ou d un plomb suspendu à une corde. 2° Terme d astronomie. Balancement apparent de la lune autour de son axe. 3° Fig. Balancement, équilibre.… …
14Libration of the moon — Libration Li*bra tion (l[ i]*br[=a] sh[u^]n), n. [L. libratio: cf. F. libration.] 1. The act or state of librating. Jer. Taylor. [1913 Webster] 2. (Astron.) A real or apparent libratory motion, like that of a balance before coming to rest. [1913… …
15Libration point — Li*bra tion point (l[ i]*br[=a] sh[u^]n point ), n. any one of five points in the plane of a system of two large astronomical bodies orbiting each other, as the Earth moon system, where the gravitational pull of the two bodies on an object are… …
16libration of the moon — the combination of four libration effects that causes parts of the side of the moon turned to the earth to be alternately visible and invisible so that as much as 59 percent of the moon s entire surface can be observed from the earth * * *… …
17LIBRATION — s. f. T. d Astronomie. Balancement apparent de la lune autour de son axe, mouvement par lequel elle nous cache et nous découvre alternativement une partie de sa surface …
18LIBRATION — n. f. T. d’Astronomie Balancement apparent d’un astre autour de son axe. Il se dit, en termes de Physique, d’un Balancement régulier, tel que celui d’un pendule …
19libration — noun /laɪˈbɹeɪ.ʃən/ a) The act of librating. b) The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than …
20LIBRATION — the name given to certain apparent movements in the moon as if it swayed like a balance both in latitude and longitude in its revolution round the earth …
