from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A heliostat that may be used with stars as well as the sun
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. A heliostat regulated to sidereal time. See cut under heliostat.
Sorry, no etymologies found.
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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