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declination

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declination


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Declination  \Dec`li*na"tion\,  n.  [L.  declinatio  a  bending  aside, 
  an  avoiding:  cf  F.  d['e]clination  a  decadence.  See 
  {Declension}.] 
  1.  The  act  or  state  of  bending  downward;  inclination;  as 
  declination  of  the  head. 
 
  2.  The  act  or  state  of  falling  off  or  declining  from 
  excellence  or  perfection;  deterioration;  decay;  decline 
  ``The  declination  of  monarchy.''  --Bacon. 
 
  Summer  .  .  .  is  not  looked  on  as  a  time  Of 
  declination  or  decay.  --Waller. 
 
  3.  The  act  of  deviating  or  turning  aside;  oblique  motion; 
  obliquity;  withdrawal. 
 
  The  declination  of  atoms  in  their  descent. 
  --Bentley. 
 
  Every  declination  and  violation  of  the  rules 
  --South. 
 
  4.  The  act  or  state  of  declining  or  refusing;  withdrawal; 
  refusal;  averseness. 
 
  The  queen's  declination  from  marriage.  --Stow. 
 
  5.  (Astron.)  The  angular  distance  of  any  object  from  the 
  celestial  equator,  either  northward  or  southward. 
 
  6.  (Dialing)  The  arc  of  the  horizon,  contained  between  the 
  vertical  plane  and  the  prime  vertical  circle,  if  reckoned 
  from  the  east  or  west,  or  between  the  meridian  and  the 
  plane,  reckoned  from  the  north  or  south. 
 
  7.  (Gram.)  The  act  of  inflecting  a  word  declension.  See 
  {Decline},  v.  t.,  4. 
 
  {Angle  of  declination},  the  angle  made  by  a  descending  line 
  or  plane,  with  a  horizontal  plane. 
 
  {Circle  of  declination},  a  circle  parallel  to  the  celestial 
  equator. 
 
  {Declination  compass}  (Physics),  a  compass  arranged  for 
  finding  the  declination  of  the  magnetic  needle. 
 
  {Declination  of  the  compass}  or  {needle},  the  horizontal 
  angle  which  the  magnetic  needle  makes  with  the  true 
  north-and-south  line 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Refraction  \Re*frac"tion\  (r?*fr?k"sh?n),  n.  [F.  r['e]fraction.] 
  1.  The  act  of  refracting,  or  the  state  of  being  refracted. 
 
  2.  The  change  in  the  direction  of  ray  of  light,  heat,  or  the 
  like  when  it  enters  obliquely  a  medium  of  a  different 
  density  from  that  through  which  it  has  previously  moved 
 
  Refraction  out  of  the  rarer  medium  into  the  denser, 
  is  made  towards  the  perpendicular.  --Sir  I. 
  Newton. 
 
  3.  (Astron.) 
  a  The  change  in  the  direction  of  a  ray  of  light,  and 
  consequently,  in  the  apparent  position  of  a  heavenly 
  body  from  which  it  emanates,  arising  from  its  passage 
  through  the  earth's  atmosphere;  --  hence  distinguished 
  as  atmospheric  refraction,  or  astronomical  refraction. 
  b  The  correction  which  is  to  be  deducted  from  the 
  apparent  altitude  of  a  heavenly  body  on  account  of 
  atmospheric  refraction,  in  order  to  obtain  the  true 
  altitude. 
 
  {Angle  of  refraction}  (Opt.),  the  angle  which  a  refracted  ray 
  makes  with  the  perpendicular  to  the  surface  separating  the 
  two  media  traversed  by  the  ray. 
 
  {Conical  refraction}  (Opt.),  the  refraction  of  a  ray  of  light 
  into  an  infinite  number  of  rays,  forming  a  hollow  cone. 
  This  occurs  when  a  ray  of  light  is  passed  through  crystals 
  of  some  substances,  under  certain  circumstances.  Conical 
  refraction  is  of  two  kinds;  external  conical  refraction, 
  in  which  the  ray  issues  from  the  crystal  in  the  form  of  a 
  cone,  the  vertex  of  which  is  at  the  point  of  emergence; 
  and  internal  conical  refraction,  in  which  the  ray  is 
  changed  into  the  form  of  a  cone  on  entering  the  crystal, 
  from  which  it  issues  in  the  form  of  a  hollow  cylinder. 
  This  singular  phenomenon  was  first  discovered  by  Sir  W.  R. 
  Hamilton  by  mathematical  reasoning  alone,  unaided  by 
  experiment. 
 
  {Differential  refraction}  (Astron.),  the  change  of  the 
  apparent  place  of  one  object  relative  to  a  second  object 
  near  it  due  to  refraction;  also  the  correction  required 
  to  be  made  to  the  observed  relative  places  of  the  two 
  bodies. 
 
  {Double  refraction}  (Opt.),  the  refraction  of  light  in  two 
  directions,  which  produces  two  distinct  images.  The  power 
  of  double  refraction  is  possessed  by  all  crystals  except 
  those  of  the  isometric  system.  A  uniaxial  crystal  is  said 
  to  be  optically  positive  (like  quartz),  or  optically 
  negative  (like  calcite),  or  to  have  positive,  or  negative, 
  double  refraction,  according  as  the  optic  axis  is  the  axis 
  of  least  or  greatest  elasticity  for  light;  a  biaxial 
  crystal  is  similarly  designated  when  the  same  relation 
  holds  for  the  acute  bisectrix. 
 
  {Index  of  refraction}.  See  under  {Index}. 
 
  {Refraction  circle}  (Opt.),  an  instrument  provided  with  a 
  graduated  circle  for  the  measurement  of  refraction. 
 
  {Refraction  of  latitude},  {longitude},  {declination},  {right 
  ascension},  etc.,  the  change  in  the  apparent  latitude, 
  longitude,  etc.,  of  a  heavenly  body,  due  to  the  effect  of 
  atmospheric  refraction. 
 
  {Terrestrial  refraction},  the  change  in  the  apparent  altitude 
  of  a  distant  point  on  or  near  the  earth's  surface,  as  the 
  top  of  a  mountain,  arising  from  the  passage  of  light  from 
  it  to  the  eye  through  atmospheric  strata  of  varying 
  density. 
 
  From  WordNet  r  1.6  [wn]: 
 
  declination 
  n  1:  (astronomy)  the  angular  distance  to  a  point  on  a  celestial 
  object  measured  north  or  south  from  the  celestial 
  equator;  expressed  in  degrees;  used  with  right  ascension 
  to  specify  positions  on  the  celestial  sphere  [syn:  {celestial 
  latitude},  {DEC}] 
  2:  the  polite  declining  of  an  invitation  [syn:  {refusal},  {regrets}] 




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