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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 siderostat
 定星鏡

From: Webster's Revised Unabridged Dictionary (1913)

 Sid·er·o·stat n.  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.
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