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coelostat
[see-luh-stat]
noun
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.
coelostat
/ ˈːəˌæ /
noun
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
51Թ History and Origins
Origin of coelostat1
51Թ History and Origins
Origin of coelostat1
Example Sentences
The corona was photographed by Professor Barnard, at Wadesborough, North Carolina, with a 61-1/2-foot horizontal "coelostat."
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