Coelostat meaning

sēləstat
An optical system, used with a fixed telescope, consisting of two mirrors with a moving mirror mounted on an axis parallel to the earth's axis of rotation and driven by clockwork so as to reflect the same portion of the sky continuously or to track the sun.
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(astronomy) A device that rotates a telescope so as to keep its orientation constant with relation to the stars.
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Origin of coelostat

  • Related to Latin coelestis (“sky”), corrupted form of caelestis.

    From Wiktionary