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词条 siderostat
释义
siderostat
instrument
any of a class of astronomical instruments consisting of a flat mirror that is turned slowly by a motor to reflect a given region of the sky continuously into a fixed telescope. In the traditional siderostat, the mirror is rotated by a lever arm connected to a motor that turns at a rate of one revolution every 24 hours. This so-called Foucault siderostat provides a fixed but rotating image. In recent years the Foucault siderostat has been largely supplanted by the heliostat (q.v.), which is a polar siderostat, and by the coelostat (q.v.).
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更新时间:2025/4/10 15:11:44