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单词	siderostat
释义	siderostat /ˈsɪd(ə)rə(ʊ)stat / /ˈsʌɪd(ə)rə(ʊ)stat/ noun Astronomy An instrument used for keeping the image of a celestial object in a fixed position.The six mirrors, or siderostats, are mounted at regular intervals along a Y-shaped set of tubes.... The six imaging siderostats can be mounted on any one of the concrete piers apparent along the arms of the Y, providing the maximum baseline of 437 meters. One array consists of four stationary astrometric siderostats with baselines between 18 m and 35 m, while the other contains six movable imaging siderostats with baselines up to 435 m.
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