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Reducing Sights Using Pub 249 , Continued - 14220_291
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Latitude by Local Apparent Noon (LAN), Continued - 14220_293
Latitude by Local Apparent Noon (LAN) Time  of Meridian Passage The  purpose  of  knowing  ahead  of  time  the  exact  time  of  meridian passage  (the  Sun  directly  overhead)  of  the  Sun  is  to  allow  the  observer and  recorder  to  arrive  on  the  bridge  a  few  minutes  early.  A  latitude  line from  LAN  is  very  useful.  It  is  often  used  along  with  two  morning sunlines  to  establish  a  noon  celestial  running  fix.  We  will  again  be using  a  strip  form  to  complete  our  sight  reduction.  First,  we  will  find the  time  of  meridian  passage,  then  we  will  work  the  LAN  solution.  For our  example  problem,  we  will  use  the  following  data:  Date:  30  March 84,  DR  Lat:  36°36.1'N,  DR  Long:  19°  22.3'W. OPNAV  3130/35 ACTION Completed Strip LAN Form DR Long Enter  the  DR  longitude. 19°  22.3'W STD Meridian Enter  the  standard  meridian. 15 d long (arc) Find  the  difference  between  STD  Mer  and 22.3' DR Long. d long (time) Convert  arc  to  time  using  the  arc  to  time +  17  Min page  in  the  Nautical  Almanac. LMT Mer Pass From  the  daily  pages  in  the  Nautical 1204 Almanac  for  the  given  date,  enter  the  time of  meridian  passage  (bottom  right  of  page). ZT  LAN  (1st  est.) IF... THEN... 1221 west of the Add  d  long  (time) standard  meridian to  LMT  Mer  Pass. east  of  the standard  meridian Subtract  d  long (time)  from  LMT Mer Pass. Rev.DR  Long STD  Meridian d long (arc) d long (time) LMT  Mer  Pass ZT  LAN  (2nd  est) Enter  revised  DR. Enter  the  standard  meridian. Find  the  difference  between  STD  Mer  and DR Long. Convert  arc  to  time. Enter  LMT  for  Mer  Pass. Add  time  to  LMT  Mer  Pass. 19° 22.3'W 15 40.0' +19 1204 1223 9-36

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