Heliostat

[Sarah]

An instrument consisting of a mirror moved by clockwork, bywhich a sunbeam is made apparently stationary, by being steadilydirected to one spot during the whole of its diurnal period; also, ageodetic heliotrope.

[Gregory]

A mirror that reflects solar rays onto a central receiver. A heliostat automatically adjusts its position to track daily or seasonal changes in the suns position. The arrangement of heliostats around a central receiver is also called a solar collector field.

[Tanya Shivari]

An apparatus containing a movable or driven mirror, used to reflect sunlight in a fixed direction.