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apsides

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apsides


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Apsides  \Ap"si*des\,  n.  pl 
  See  {Apsis}. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Apsis  \Ap"sis\  ([a^]p"s[i^]s),  n.;  pl  {Apsides} 
  ([a^]p"s[i^]*d[=e]z).  See  {Apse}.  [L.  apsis,  absis,  Gr 
  "apsi`s,  "apsi^dos,  a  tying,  fastening,  the  hoop  of  a  wheel, 
  the  wheel,  a  bow,  arch,  vault,  fr  "a`ptein  to  fasten.] 
  1.  (Astron.)  One  of  the  two  points  of  an  orbit,  as  of  a 
  planet  or  satellite,  which  are  at  the  greatest  and  least 
  distance  from  the  central  body,  corresponding  to  the 
  aphelion  and  perihelion  of  a  planet,  or  to  the  apogee  and 
  perigee  of  the  moon.  The  more  distant  is  called  the  higher 
  apsis;  the  other  the  lower  apsis;  and  the  line  joining 
  them  the  line  of  apsides. 
 
  2.  (Math.)  In  a  curve  referred  to  polar  co["o]rdinates,  any 
  point  for  which  the  radius  vector  is  a  maximum  or  minimum. 
 
  3.  (Arch.)  Same  as  {Apse}. 




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