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Chapter 9 Celestial Observations and Sight Reduction Methods
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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Azimuth of the Sun, Continued - 14221_259
Methods For Finding Gyrocompass Error Introduction There  are  three  celestial  methods  used  by  QMs  for  finding  gyrocompass error.   They   are: Azimuth  of  the  Sun Azimuth  of  Polaris Amplitude  of  the  Sun In  each  case,  you  are  required  to  gather  data  for  use  in  computation. This  data  may  be  in  the  form  of  sights  from  the  sextant,  time  in  GMT, DR  Lat.  and  Long.,  and  so  forth.  For  each  celestial  method,  we  will begin  with  gathering  the  necessary  data  and  then  working  the  solutions. Azimuth of the You  must  know  the  following  values  to  determine  gyrocompass  errror Sun by azimuth: Gathering Data Time  of  the  actual  observation Date  of  the  observation DR  position  at  the  time  of  observation Azimuth  (gyro  bearing  of  the  Sun) Rule:  Due  to  the  elevation  of  the  Sun,  azimuths  should  be  taken  in mid-morning  or  mid-afternoon. Use  the  following  table  to  gather  the  data  to  work  the  azimuth  solution. You  must  have  a  recorder  present  to  mark  and  record  the  exact  time  of the  observation Step Action 1. Obtain  a  time  tick  from  WRN-6  or  chronometer  with  a stopwatch. 2. Break  out  and  place  the  azimuth  circle  on  the  gyro  repeater closest  to  the  Sun. 3. Align  the  Sun  in  the  reflecting  mirror  in  a  manner  so  that  the rays  reflect  back  through  the  prism  housing  and  onto  the compass  card. 4. When  each  spirit  level  is  leveled,  mark  the  time  and  record  the reflected  gyro  bearing  from  the  compass  card  to  the  nearest 0.1°.    Note:  This  is  a  difficult  procedure  in  heavy  seas; however,  if  the  azimuth  circle  is  not  level,  errors  will  occur. 5. Repeat  steps  4  and  5  a  minimum  of  three  times. 9-2

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