• synonyms


[ see-luh-stat ]
/ ˈsi ləˌstæt /

noun Astronomy.

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.

Nearby words

coeliac disease, coelom, coelomate, coelomic, coeloscope, coelostat, coelurosaur, coemption, coen, coen-, coenacle
Compare siderostat.

Origin of coelostat

1895–1900; coelo- (for Latin caeli-, combining form of caelum sky) + -stat Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for coelostat

  • It will be laid comfortably flat on the ground, and the rays of light reflected into it by a coelostat.

    Astronomical Discovery|Herbert Hall Turner

British Dictionary definitions for coelostat


/ (ˈsiːləˌstæt) /


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 telescopeCompare siderostat

Word Origin for coelostat

C19 coelo-, from Latin caelum heaven, sky + -stat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012