Heliostat
From LoveToKnow 1911
HELIOSTAT (from Gr. '4Acos, the sun, o rar6s, fixed, set up), an instrument which will reflect the rays of the sun in a fixed direction notwithstanding the motion of the sun.
heliostat: a scientific instrument which holds an image of the sun stationary, allowing extended observation (e.g. for solar spectrometry).
Heliostat
A Heliostat is a device that tracks the movement of the sun. It is typically used to orient a mirror, throughout the day, to redirect sunlight along a fixed axis towards a stationary target or receiver....
and Fahrenheit
Fahrenheit ...
heliostats (NASA Thesaurus) Instruments consisting of mirrors moved by clockwork for reflecting the sun's rays in a fixed direction.
[46] If these systems use single or dual-axis tracking to improve performance, they may be referred to as Heliostat Concentrator Photovoltaics (HCPV).
A careful examination of the text makes it clear, however, that Copernicus really had come to believe in the heliocentric system--rather, heliostatic, since he placed the Sun at some distance from the centre--as a true picture of the universe.
The telescope is called a heliostat because the mirror itself follows the Sun, so the reflected beam remains stationary within the shaft.
The Solar Tower Atmospheric Cerenkov Effect Experiment (STACEE) will use as its primary collection mirror the large field of 220 solar heliostat mirrors at the National Solar Thermal Test Facility (NSTTF) of Sandia National Laboratories.
largest telescopes, the mass and cost of an equatorial mount is prohibitive. The simple structure of an alt-azimuth mount is much better suited to such large heavy instruments.
See also
*Telescope
*Telescope mount
*Equatorial mount
*Heliostat ...
 See also: Light, Day, Earth, Solar, Second
  
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