Manfred Tinebor
Heliostats
A heliostat (from helios, the Greek word for sun, and stat, as in stationary) is a device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space. Here the target is a solar receiving tower.