heliostat ( synonym found)
Definition of heliostat:

(n) : a device, consisting of a mirror turned by clockwork, to reflect the light of the sun in some fixed direction; now used with some measuring device to continuously monitor the sun's output
Definition of heliostat:

(n) : a device, consisting of a mirror turned by clockwork, to reflect the light of the sun in some fixed direction; now used with some measuring device to continuously monitor the sun's output
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