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coelostat

[see-luh-stat] /ˈsi ləˌstæt/
noun, Astronomy
1.
an apparatus consisting of a mirror driven by clockwork, used to enable a fixed telescope to keep the same area of sky in its field of view by compensating for the apparent rotation of the celestial sphere.
Compare siderostat.
Origin of coelostat
1895-1900
1895-1900; coelo- (for Latin caeli-, combining form of caelum sky) + -stat
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for coelostat

coelostat

/ˈsiːləˌstæt/
noun
1.
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
Word Origin
C19 coelo-, from Latin caelum heaven, sky + -stat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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