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Page Title: Latitude by Local Apparent Noon (LAN), Continued
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Latitude by Local Apparent Noon (LAN), Continued - 14220_293
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Latitude by Local Apparent Noon (LAN), Continued - 14220_295
Latitude by Local Apparent Noon (LAN), Continued Numerous Sights The  method  of  taking  numerous  sights  is  a  modification  of  the maximum  altitude  method.  It  is  useful  under  conditions  where  heavy seas,  clouds,  and  the  like  may  make  steady  observation  impossible. Well  before  watch  time  of  LAN,  the  observer  begins  taking  a  series  of altitudes.  Their  number  depends  on  the  difficulties  of  the  situation  and the  possible  error  in  computed  time  of  transit.  He/she  reads  off  the altitudes  to  a  recording  assistant,  turning  the  tangent  screw  slightly  after each  observation  to  make  sure  that  the  next  altitude  is  an  independent sight.  Observations  are  discontinued  when  the  altitude  definitely  shows signs  of  decreasing. Under  favorable  conditions,  even  a  series  of  skillfully  taken  observations may  show  an  occasional  erratic  deviation  from  the  normal  gradual  rise and  fall.  After  sights  showing  a  radical  difference  from  the  preceding  or succeeding  series  are  discarded,  however,  the  hang  should  become evident,  and  it  should  be  possible  to  judge  the  maximum  altitude.  The figure  selected  will  probably  be  less  than  the  altitude  shown  in  one observation  and  more  than  that  below  it.  The  result  should  give  latitude with  an  error  no  more  than  1'.  This  reading  is  considerably  more accurate  than  could  be  obtained  by  a  single  sight  under  the  conditions described. Finding Latitude As  you  now  know,  you  must  first  obtain  a  sight  of  the  Sun  when  it’s  at maximum  altitude  and  the  time  of  observation.  With  this  and  a  DR position,  we  can  reduce  the  sight  to  find  latitude;  now  we  can  work  the second  part  of  our  strip  form. 9-38

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