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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]
ThesaurusLegend:  Synonyms Related Words Antonyms
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


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Then Anthony Cook, the landmark's official astronomical observer, dialed in the tracking coelostat despite a lingering marine layer that threatened to obscure the view.
 
 
 
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