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Reference Lines on Earth, Continued - 14221_26
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The Nautical Chart - 14221_28
Reference Lines on Earth, Continued Meridians  of Longitude Meridians  of  longitude  are  the  great  circles.  They  all  pass  through  the center  of  Earth.  The  prime  meridian  or  0°  of  longitude  is  the  starting point  for  all  longitude  measurements.  Longitude  is  measured  in  same manner  as  latitude  except  that  it  is  measured  east  or  west  throughout 180°.  The  prime  meridian  is  also  known  as  the  Greenwich  meridian.  It is  so  named  because  is  passes  directly  through  Greenwich,  England. Latitude  and  longitude  comprise  the  terrestrial  or  geographic  coordinate system.  Figure  1-9  illustrates  how  a  position  is  located  on  a  chart.  We will  discuss  the  mechanics  of  plotting  a  position  on  a  nautical  chart  later in this chapter. Before  we  can  do  that  we  have  to  learn  more  about  the charts  we  use. Figure  1-9.  Locating  a  position  on  a  nautical  chart. 1-11

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