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heliostat

[hee-lee-uh-stat] /ˈhi li əˌstæt/
noun
1.
an instrument consisting of a mirror moved by clockwork, for reflecting the sun's rays in a fixed direction.
Origin
1740-1750
1740-50; < Neo-Latin heliostata. See helio-, -stat
Related forms
heliostatic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for helio-static

heliostat

/ˈhiːlɪəʊˌstæt/
noun
1.
an astronomical instrument used to reflect the light of the sun in a constant direction
Derived Forms
heliostatic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for helio-static

heliostat

instrument used in solar telescopes to orient and focus sunlight along a fixed direction. A typical heliostat consists of a flat plane mirror and a curved parabolic mirror. The plane mirror is mounted along an axis parallel (i.e., equatorial) to the Earth and rotated slowly by a motor to reflect light from the Sun. The parabolic mirror focuses the reflected rays into the telescope along a fixed direction while the Sun traverses the sky. Therefore, as the telescope's field of view rotates, different celestial objects move quickly into view

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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8
8
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