heliostat A movable flat mirror used to reflect sunlight into a stationary solar telescope. If the telescope is aligned with Earth's axis, only one mirror is needed. A heliostat is similar to a coelostat, but has a simpler design and (unlike the coelostat) makes the image of the Sun rotate as the Sun moves along the sky. Related category SOLAR TOPICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |