siderostat (n.) An apparatus consisting essentially of a mirror moved
by clockwork so as to throw the rays of the sun or a star in a fixed
direction; -- a more general term for heliostat.
Chambers DictionaryChamber's 20th Century Dictionary📕
siderostat sid′e-rō-stat, n. a heliostat
adapted to sidereal time.—adj.Siderostat′ic. [L. sidus,
sideris a star, Gr. statos, standing.]
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