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equator

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equator


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Equator  \E*qua"tor\,  n.  [L.  aequator  one  who  equalizes:  cf  F. 
  ['e]quateur  equator.  See  {Equate}.] 
  1.  (Geog.)  The  imaginary  great  circle  on  the  earth's  surface, 
  everywhere  equally  distant  from  the  two  poles,  and 
  dividing  the  earth's  surface  into  two  hemispheres. 
 
  2.  (Astron.)  The  great  circle  of  the  celestial  sphere, 
  coincident  with  the  plane  of  the  earth's  equator;  --  so 
  called  because  when  the  sun  is  in  it  the  days  and  nights 
  are  of  equal  length;  hence  called  also  the  {equinoctial}, 
  and  on  maps,  globes,  etc.,  the  {equinoctial  line}. 
 
  {Equator}  {of  the  sun  or  of  a  planet}  (Astron.),  the  great 
  circle  whose  plane  passes  through  through  the  center  of 
  the  body,  and  is  perpendicular  to  its  axis  of  revolution. 
 
 
  {Magnetic  equator}.  See  {Aclinic}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  equator 
  n  1:  an  imaginary  line  around  the  Earth  forming  the  great  circle 
  that  is  equidistant  from  the  north  and  south  poles;  "the 
  equator  is  the  boundary  between  the  northern  and 
  southern  hemispheres" 
  2:  a  circle  dividing  a  sphere  or  other  surface  into  two  usually 
  equal  and  symmetrical  parts 




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