Quantcast Variation - 14221_58

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Earth’s  Magnetic  Field - 14221_57
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How  to  Determine  Local  Variation - 14221_59
Variation Information As  stated  in  the  topic  on  magnetism,  Earth  has  magnetic  properties  and can  be  thought  of  as  having  a  powerful  magnetic  bar  near  its  center. The  lines  of  force  appear  as  illustrated  in  figure  2-3. Facts Figure  2-3.  Chart  No.  42  showing  lines  of  variation. Earth’s  magnetic  properties  are  not  uniformly  distributed. Earth’s  magnetic  poles  are  not  at  the  same  position  as  the  geographic poles. Magnetic  lines  of  force  are  called  magnetic  meridians. The  variation  for  any  area  on Earth  is  always  equal  to  the difference  between  the  value  of true  north  and  magnetic  north. Example: True  north 000° Mag.  north 358° Variation  = 2° East 2-4 Figure  2-4.  Variation  equals  the angular  difference  between  true  north and  magnetic  north.

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