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To slew a telescope is to move (rotate) it in order to aim it. In the case of a space telescope, it may mean rotating the entire craft. The word is used as a verb and also as a noun, meaning an instance of such movement. A slew angle is the angular distance covered by a slew, and a slew time is the length of time taken to carry it out. A slew speed (in angle per second) may be cited for an observation or sequence of observations, or may be cited as a capability of a telescope.