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siderostat 定星鏡 定星鏡 Siderostat \Sid"er*o*stat\, n. [L. sidus, sideris, a star Gr.
??? standing, fixed, fr. ???? to place.] (Astron.) 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}. [1913 Webster]
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