SIDEROSTAT
\sˈa͡ɪdəɹˌɒstat], \sˈaɪdəɹˌɒstat], \s_ˈaɪ_d_ə_ɹ_ˌɒ_s_t_a_t]\
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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.
By Oddity Software