Century Dictionary and Cyclopedia
- n. A heliostat regulated to sidereal time. See cut under heliostat.
GNU Webster's 1913
- 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.
“Sir Howard Grubb, moreover, set up, in 1882, a kind of siderostat at the Crawford Observatory, Cork.”
“The largest siderostat in the world is the Paris 50-inch refractor, which formed the chief attraction of the Palais d'Optique at the Exhibition of 1900.”
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things that check or hold in place
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