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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 TOPICSAlso on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History