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Page Title: Chapter 9 Celestial Observations and Sight Reduction Methods
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Chapter 9 Celestial Observations and Sight Reduction Methods Introduction In  this  chapter  you  will  learn  the  methods  that  are  necessary  to  complete a  day’s  work  in  navigation.  These  include  several  ways  of  finding gyrocompass  error,  reducing  sunlines  and  moonlines,  finding  latitude  by LAN  or  Polaris,  and  reducing  sights  of  stars  and  planets. We’ve  already  covered  the  basics  of  celestial  navigation  in  chapter  6. You  may  want  to  occassionally  refer  back  to  that  material  to  have  a clearer  understanding  of  this  material.  We  will  discuss  the  procedure aspect  of  performing  and  reducing  celestial  observations  only.  As  you become  more  familiar  with  this  subject,  you  are  advised  to  increase  your knowledge  by  studying  references  such  as  Dutton’s  Navigation  and Piloting  and  Bowditch  Pub  No.  9. Objectives The  material  in  this  chapter  will  enable  the  student  to: Determine  gyrocompass  error  by  azimuth  of  the  Sun  and  Polaris,  and amplitude  of  the  Sun. Reduce  sights  taken  on  the  Sun,  Moon,  stars,  and  planets  using  H.O. 229,  Sight  Reduction  Tables  for  Marine  Navigation,  and  the  Nautical Almanac. Reduce  sights  taken  on  the  stars  using  H.O.  249,  Sight  Reduction Tables  for  Air  Navigation  and  the  Air  Almanac. Determining  latitude  by  local  apparent  noon. Plot  celestial  LOPs  based  on  assumed  positions. Azimuth  of  the  Sun Topic Page 9-2 Azimuth  by  Polaris 9-11 Amplitude  of  the  Sun 9-12 Celestial  LOP 9-16 Using  the  Sextant 9-18 Altitude  Corrections Reducing  Sunlines  Using  Pub  229 Plotting  LOPs 9-19 9-24 9-28 Advancing   LOPs 9-29 Reducing  Sights  using  Pub  249 9-32 Latitude  by  LAN 9-36 9-1

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