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astrolabe

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astrolabe


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Astrolabe  \As"tro*labe\  ([a^]s"tr[-o]*l[=a]b),  n.  [OE. 
  astrolabie  astrilabe  OF  astrelabe  F.  astrolabe,  LL 
  astrolabium  fr  Gr  'astrola`bon;  'a`stron  star  +  ?,  ?,  to 
  take.] 
  1.  (Astron.)  An  instrument  for  observing  or  showing  the 
  positions  of  the  stars.  It  is  now  disused. 
 
  Note:  Among  the  ancients,  it  was  essentially  the  armillary 
  sphere.  A  graduated  circle  with  sights,  for  taking 
  altitudes  at  sea,  was  called  an  astrolabe  in  the  18th 
  century.  It  is  now  superseded  by  the  quadrant  and 
  sextant. 
 
  2.  A  stereographic  projection  of  the  sphere  on  the  plane  of  a 
  great  circle,  as  the  equator,  or  a  meridian;  a 
  planisphere.  --Whewell. 
 
  From  WordNet  r  1.6  [wn]: 
 
  astrolabe 
  n  :  an  early  form  of  sextant 




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