siderostat

POS

Noun

TANDA HUBUNG

sid=er=o=stat

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CIDE DICTIONARY

siderostat, n. [L. sidus, sideris, a star + Gr. standing, fixed, fr. to place.].

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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OXFORD DICTIONARY

siderostat, n. an instrument used for keeping the image of a celestial body in a fixed position.

Etymology

L sidus sideris star, after heliostat