coelostat

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coelostat

(ˈsiːləˌstæt)
n
(Astronomy) an astronomical instrument consisting of a plane mirror mounted parallel to the earth's axis and rotated about this axis once every two days so that light from a celestial body, esp the sun, is reflected onto a second mirror, which reflects the beam into a telescope. Compare siderostat
[C19 coelo-, from Latin caelum heaven, sky + -stat]
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Noun1.coelostat - optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror
optical device - a device for producing or controlling light