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Page Title: Amplitude of the Sun, Continued
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Amplitude of the Sun, Continued Finding Amplitude  of the Sun Using the  Celestial Horizion, continued With  the  amplitude  properly  labeled,  we  can  now  follow  another  set  of rules  to  determine  the  azimuth. Rules: 1.  Rising  Sun  with  north  declination,  subtract  the  amplitude  from  090° 2.  Rising  Sun  with  south  declination,  add  the  amplitude  to  090° 3.  Setting  Sun  with  north  declination,  add  the  amplitude  to  270° 4.  Setting  Sun  with  south  declination,  subtract  the  amplitude  from  270° By  following  the  rules  above,  our  amplitude  can  now  be  converted  to  an azimuth  as  follows: W31.2°N  +  270°  =  301.2° Our  true  bearing  to  the  Sun  was  300°.  Gyro  error  can  be  determined  as follows: 301.2°    (azimuth) 300.0°  (gyro  bearing) 1.2  °E  (gyro  error) We  find  the  name  of  the  error  by  using  our  memory  aid Gyro  least  -  error  EAST,  Gyro  best  -  error  WEST. Finding If  the  body  is  observed  when  its  center  is  on  the  visible  horizon,  a Amplitude  Using   correction  from  table  28  of  Bowditch,  Volume  II,  is  applied  to  the  value the  Visible Horizion taken  from  Bowditch’s  table  27.  Refer  to  table  28  for  step-by-step instructions. 9-15

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