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siderealmore about sidereal

sidereal

 

  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Month  \Month\,  n.  [OE.  month,  moneth,  AS  m[=o]n?,  m[=o]na?; 
  akin  to  m[=o]na  moon,  and  to  D.  maand  month,  G.  monat,  OHG. 
  m[=a]n[=o]d,  Icel.  m[=a]nu?r,  m[=a]na?r,  Goth.  m[=e]n[=o]?s. 
  [root]272.  See  {Moon}.] 
  One  of  the  twelve  portions  into  which  the  year  is  divided; 
  the  twelfth  part  of  a  year,  corresponding  nearly  to  the 
  length  of  a  synodic  revolution  of  the  moon,  --  whence  the 
  name  In  popular  use  a  period  of  four  weeks  is  often  called 
  a  month. 
 
  Note:  In  the  common  law,  a  month  is  a  lunar  month,  or 
  twenty-eight  days,  unless  otherwise  expressed. 
  --Blackstone.  In  the  United  States  the  rule  of  the 
  common  law  is  generally  changed,  and  a  month  is 
  declared  to  mean  a  calendar  month.  --Cooley's 
  Blackstone. 
 
  {A  month  mind}. 
  a  A  strong  or  abnormal  desire.  [Obs.]  --Shak. 
  b  A  celebration  made  in  remembrance  of  a  deceased  person  a 
  month  after  death.  --Strype. 
 
  {Calendar  months},  the  months  as  adjusted  in  the  common  or 
  Gregorian  calendar;  April,  June,  September,  and  November, 
  containing  30  days,  and  the  rest  31,  except  February, 
  which  in  common  years,  has  28,  and  in  leap  years  29. 
 
  {Lunar  month},  the  period  of  one  revolution  of  the  moon, 
  particularly  a  synodical  revolution;  but  several  kinds  are 
  distinguished,  as  the  {synodical  month},  or  period  from 
  one  new  moon  to  the  next  in  mean  length  29  d.  12  h.  44  m. 
  2.87  s.;  the  {nodical  month},  or  time  of  revolution  from 
  one  node  to  the  same  again  in  length  27  d.  5  h.  5  m.  36 
  s.;  the  {sidereal},  or  time  of  revolution  from  a  star  to 
  the  same  again  equal  to  27  d.  7  h.  43  m.  11.5  s.;  the 
  {anomalistic},  or  time  of  revolution  from  perigee  to 
  perigee  again  in  length  27  d.  13  h.  18  m.  37.4  s.;  and 
  the  {tropical},  or  time  of  passing  from  any  point  of  the 
  ecliptic  to  the  same  again  equal  to  27  d.  7  h.  43  m.  4.7 
  s. 
 
  {Solar  month},  the  time  in  which  the  sun  passes  through  one 
  sign  of  the  zodiac,  in  mean  length  30  d.  10  h.  29  m.  4.1 
  s. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Sidereal  \Si*de"re*al\,  a.  [L.  sidereus,  from  sidus,  sideris  a 
  constellation,  a  star.  Cf  {Sideral},  {Consider},  {Desire}.] 
  1.  Relating  to  the  stars;  starry;  astral;  as  sidereal 
  astronomy. 
 
  2.  (Astron.)  Measuring  by  the  apparent  motion  of  the  stars; 
  designated,  marked  out  or  accompanied,  by  a  return  to  the 
  same  position  in  respect  to  the  stars;  as  the  sidereal 
  revolution  of  a  planet;  a  sidereal  day 
 
  {Sidereal  clock},  {day},  {month},  {year}.  See  under  {Clock}, 
  {Day},  etc 
 
  {Sideral  time},  time  as  reckoned  by  sideral  days,  or  taking 
  the  sidereal  day  as  the  unit,  the  time  elapsed  since  a 
  transit  of  the  vernal  equinox,  reckoned  in  parts  of  a 
  sidereal  day  This  is  strictly,  apparent  sidereal  time, 
  mean  sidereal  time  being  reckoned  from  the  transit,  not  of 
  the  true,  but  of  the  mean  equinoctial  point. 
 
  From  WordNet  r  1.6  [wn]: 
 
  sidereal 
  adj  1:  of  or  relating  to  the  stars  or  constellations;  "sidereal 
  bodies";  "the  sidereal  system" 
  2:  (of  divisions  of  time)  determined  by  daily  motion  of  the 
  stars;  "sidereal  time"  [ant:  {civil}]




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