siderostatic

siderostat

[sid-er-uh-stat]
noun
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:
1875–80; sidero-2 + -stat

siderostatic, adjective
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siderostat (ˈsaɪdərəʊˌstæt)
 
n
See also heliostat Compare coelostat 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
 
[C19: from sidero-, from Latin sidus a star + -stat, on the model of heliostat]
 
sidero'static
 
adj

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