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 alsoheliostat Comparecoelostat
[C19: fromsidero-, from Latinsidus a star + -stat, on the model of heliostat]
ˌsideroˈstaticadj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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