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.
随便看	dig a pit for digastric digastric muscle dig deep digenean digerati digest digester digestibility digestible digestif digestion digestive digestive biscuit digestive gland digestively digestivo digger digger hat digger's hat digger wasp diggings digging stick dight digibox

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