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Azimuth of the Sun, Continued - 14221_265
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Azimuth by Polaris - 14221_267
Azimuth of the Sun, Continued Tab  Z Exact  Z  (-360) Exact  Zn Drop  the  value  from  Tab  Z. Apply  the  Total  Corr  to  Tab  Z  (-  0.10). On  each  page  of  Pub  229  are  small  notes  that state: 129.1 129.0 231.0 In N. Lat. if LHA is Greater than 180 then Zn= Z if LHA is Less than 180 then Zn= 360-Z In S. Lat. if LHA is Greater than 180 then Zn= 180-Z if LHA is Less than 180 then Zn= 180+Z Gyro  Bearing Gyro  Error Our  Lat  is  N.  and  LHA  is  less  than  180, therefore  Zn=360  -  129  or  231°. Enter  the  gyro  bearing  from  the  observation. Find  the  difference  between  Exact  Zn  and  the gyro  bearing  and  name  the  error.  If  the  gyro bearing  is  less  than  the  Exact  Zn,  the  error  is easterly,  if  more  than  Exact  Zn,  it’s  westerly. Use  this  memory  aid: 231.6 0.6  West Gyro  least  -  error  east,  Gyro  best  -  error  west. We  have  now  used  the  Sun  to  find  the  error  on  our  gyrocompass.  As  stated before,  a  greater  degree  of  accuracy  can  be  obtained  by  making  several observations  and  then  working  the  solutions  and  averaging  the  results.  This may  seem  a  bit  tedious,  however,  you  may  work  all  observations  at  once. This  is  easily  accomplished  by  entering  data  in  the  strip  form  in  stages. Try  this  method.  First  enter  GMT  DR  Lat,  DR  Long,  GHA,  Dec,  and  d#. Next  find  Incements  (m/s),  LHA,  and  True  Dec.  Now  find  your  leftover values  for  Dee  Inc,  Lat  Inc,  and  LHA  Inc  and  enter  Pub  229. Once  you  have  completed  the  solutions  for  all  obsvervations,  you  can  average the  results.  Here’s  an  example: Error  1  =  .6  W  Error  2  =  .5  W  Error  3  =  .7  W  for  a  total  of  1.8  ÷  3  =  .6  W 9-10

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