heliostat
/ˈhiːlioʊˌstæt/
noun
- A device with a mirror that moves to reflect sunlight in a fixed direction, used in solar power plants and scientific instruments.
- The solar power plant uses thousands of heliostats to focus sunlight onto a central tower.
- Engineers adjusted the heliostat to direct sunlight into the laboratory window.
- A heliostat can track the sun across the sky to keep a beam of light aimed at a single spot.