siderostat

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siderostat

(ˈsaɪdərəʊˌstæt)
n
(Astronomy) an astronomical instrument consisting essentially of a plane mirror driven about two axes so that light from a celestial body, esp the sun, is reflected along a constant direction for a long period of time. See also heliostat Compare coelostat
[C19: from sidero-, from Latin sidus a star + -stat, on the model of heliostat]
ˌsideroˈstatic adj
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