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heliometer


heliometer


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Heliometer  \He`li*om"e*ter\,  n.  [Helio-  +  -meter:  cf  F. 
  h['e]liom[`e]tre.]  (Astron.) 
  An  instrument  devised  originally  for  measuring  the  diameter 
  of  the  sun;  now  employed  for  delicate  measurements  of  the 
  distance  and  relative  direction  of  two  stars  too  far  apart  to 
  be  easily  measured  in  the  field  of  view  of  an  ordinary 
  telescope.