libration libration  /laɪb ˈreɪ ʃən/

Definition(s):

  • (n) (astronomy) a real or apparent slow oscillation of a moon or satellite

Usage(s):

  • In June 1982 they instituted a series of computer commands and gentle rocket bursts that swung the spacecraft out of its libration-point orbit into eccentric earth orbits.
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periphery periphery
/pə ˈrɪ fə ri /