[ see-luh-stat ]
/ ˈsi ləˌstæt /
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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.
QUIZ YOURSELF ON "WAS" VS. "WERE"!
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Origin of coelostat
1895–1900; coelo- (for Latin caeli-, combining form of caelum sky) + -stat
Words nearby coelostat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences 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