1. 
   coelostat
   [n] - optical device used to follow the path of a celestial body and reflect its light into a telescope
   Found op http://www.webdictionary.co.uk/definition.php?query=coelostat
   
   
2. 
   coelostat
   noun optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=coelostat
   
   
3. 
   coelostat
   device consisting of a flat mirror that is turned slowly by a motor to reflect the Sun continuously into a fixed telescope. The mirror is mounted to ... [1 related articles]
   Found op http://www.britannica.com/eb/a-z/c/105
   
   
4. 
   coelostat
   The coelstat at Mt. Wilson Observatory, California A device that uses two movable mirrors to reflect sunlight along a particular path – for instance, down a fixed telescope tube – so that the image at the other end of the telescope doesn't appear to move or rotate when the Sun moves...
   Found op http://www.daviddarling.info/encyclopedia/C/coelostat.html
   
   
5. 
   coelostat
   1) Optical device
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/coelostat/1
   
   

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