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siderostat

[sid-er-uh-stat] /ˈsɪd ər əˌstæt/
noun
1.
a telescopic device for reflecting the light of a star in a constant direction, the chief component of which is a plane mirror turned by a clock mechanism to correct for the rotation of the earth.
Origin of siderostat
1875-1880
1875-80; sidero-2 + -stat
Related forms
siderostatic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for siderostat

siderostat

/ˈsaɪdərəʊˌstæt/
noun
1.
an astronomical instrument consisting essentially of a plane mirror driven about two axes so that light from a celestial body, esp the sun, is reflected along a constant direction for a long period of time See also heliostat Compare coelostat
Derived Forms
siderostatic, adjective
Word Origin
C19: from sidero-, from Latin sidus a star + -stat, on the model of heliostat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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