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The Celestial LOP - 14221_272
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Using the Sextant - 14221_274
The Celestial LOP Determining the Figure  9-8  illustrates  the  method  used  in  establishing  a  single  LOP  by LOP,  continued observing  a  star.  An  assumed  position  (AP)  is  selected  according  to certain  requirements  of  convenience  in  calculating  (described  later). Observation  of  a  star  provides  sextant  altitude  (hs).  Sextant  altitude  is then  corrected  to  obtain  observed  altitude  (Ho).  The  star’s  altitude  from the  assumed  position,  called  the  computed  altitude  (Hc),  and  its  azimuth angle  are  determined  from  tables  by  a  procedure  you  will  soon  learn. The  azimuth  angle  is  then  converted  to  azimuth.  After  selecting  an  AP, draw  the  azimuth  through  the  AP.  Along  the  azimuth,  measure  off  the altitude  intercept  (difference  between  the  observed  altitude  and  the computed  altitude).  At  the  end  of  this  measurement,  draw  a perpendicular  line,  which  is  the  LOP.  You  must  know  whether  altitude intercept  (a)  should  be  measured  from  AP  toward  the  body  or  from  AP measured  away  from  the  body.  It  is  helpful  to  remember  the  initials Ho  MO  To,  if  Ho  is  more  toward.  This  means  that  if  Ho  is  greater  than Hc  measure  altitude  intercept  (a)  from  AP  toward  the  body.  If  Hc  is greater  than  Ho  measure  altitude  intercept  (b)  from  AP  away  from  the body. Figure  9-8.  Determining  a  LOP. 9-17

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