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heliostat (plural heliostats)
- 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, and is almost always stationary relative to the heliostat, so the light is reflected in a fixed direction.
device to continuously reflect sunlight toward a predetermined target, almost always in some fixed direction, despite the sun's motions in the sky