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An instrument in which a mirror is automatically moved so that it reflects sunlight in a constant direction. It is used with a pyrheliometer to make continuous measurements of solar radiation.


(Astronomy) an astronomical instrument used to reflect the light of the sun in a constant direction
ˌhelioˈstatic adj


(ˈhi li əˌstæt)

an instrument consisting of a mirror moved by clockwork, for reflecting the sun's rays in a fixed direction.
[1740–50; < New Latin heliostata. See helio-, -stat]
he`li•o•stat′ic, adj.


[ˈhiːlɪəʊstæt] Nheliostato m
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References in periodicals archive ?
A siderostat is a variation on the heliostat, a flat mirror that reflects sunlight in a constant direction as Earth rotates.
Each heliostat is oriented by a solar tracking system and reflects the sunlight precisely to the absorber.
The final publication of his career on wind gust distribution analysis related to solar farm heliostat design was published shortly after his death.
TuNur's output, generated by roughly 825,000 heliostat flat plate mirrors, will produce power at six times the output of the world's current largest solar project.
New Heliostat Design Improves Performance and Lowers Cost
Most recently, Sommers has worked as a senior automation engineer, including designing a large scale, dense wireless mesh network for a 100k autonomous heliostat, at Abengoa Solar.
Critical to each heliostat is a self-contained power supply that provides reliable power to each motor, while also supporting wireless connectivity throughout the network, delivering the critical data needed to support synchronous movement of all.
The plant was of interest owing to its size --it consisted of a field of 63 heliostat mirrors that automatically tracked the motion of the sun, reflecting incident radiation onto a huge parabolic reflector.
Here, daylight shines in through a massive glass atrium, and is enhanced by the use of a heliostat.
The heliostat array can account for up to 60 percent of the capital costs of a solar thermal facility; so if possible, facilities should be designed to make full use of the light falling on the mirrors.
The shading saves cooling energy, while the heliostat directs sunlight for heating and lighting into or away from the building and the adjoining park when it is most needed.
These systems are usually formed by an external collecting tool like a heliostat and a duct.