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Azimuth of the Sun, Continued - 14220_260
Azimuth of the Sun, Continued Gathering  Data Now  that  we  have  three  good  observations,  we  need  only  to  find  the  DR position  for  each  obvservation  to  have  the  data  we  need  to  find  the azimuth  of  the  Sun.  We  will  work  an  example  problem  using  OPNAV strip  form  AZIMUTH  BY  PUB  229.  For  brevity,  we’ll  work  on  one observation  only.  In  actual  practice,  it’s  faster  to  work  out  all  three  at the  same  time  by  placing  the  strip  form  on  the  left  and  working  the three  observations  in  the  next  three  columns.  The  purpose  of  taking  at least  three  observations  is  to  allow  us  to  find  errors  when  taking observations  and  averaging  gyro  error.  This  process  normally  provides the  best  results  in  determining  total  gyro  error. Besides  the  data  from  the  observation,  you’ll  need  the  Nautical  Almanac and  Pub  229  to  solve  the  problem. From  the  strip  form  and  publication  we  will  find  out  exactly  what  the gyro  bearing  should  read,  then  we  will  compare  that  value  to  the  actual gyro  bearing  from  the  observation.  The  result  will  be  our  gyro  error. Example Problem For  our  example  problem,  we  will  assume  that  we  have  gathered  the following  data: Date: 19 Nov 84 DR Lat.: 33° 37' N DR Long.: 112° 39' E ZT: 15h 42m 22s Gyro Brg: 231.6° On  the  following  pages,  you  will  find  the  page  laid  out  with  the  blank strip  form  on  the  left,  the  action  steps  in  the  middle,  and  the  result  on the right. 9-3

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