librational motion

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Tether satellite — A tether satellite is a satellite connected to another by a thin cable called a tether. The space tether idea had its origin in the late 1800s. The idea became more popular in the 1960s, and subsequently NASA examined the feasibility of the idea… … Wikipedia
libration — 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… … Universalium

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