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Page Title: Reducing Sights Using Pub 249 , Continued
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Reducing Sights Using Pub 249, Continued OPNAV  3130/32 ACTION Completed Strip H.O.249 Air Alm Form GHA(h) Enter  the  GHA  hour  value  of  Aries  from 282° 35.1' the  Air  Almanac  to  the  nearest  10  minutes. (See  fig.  9-18). Increment   (m/s) Enter  the  minutes  and  seconds  value  from 1° 35.5' the  interpolation  tables  of  the  Air  Almanac. Total  GHA Add  GHA(h)  and  Increments  (m/s). 284° 10.6' +  -  360  (if  needed) a  Long  (+E,  -W) Enter  the  assumed  DR  longitude  to  arrive  at 17°  10.6'W an  even  degree  of  LHA,  add  east  and subtract  west. LHA a LAT Hc Ho a LHA=  Total  GHA  +  (v/v  or  SHA  for  stars and  planets)  +E  or  -W  DR  Long. Enter  the  assumed  latitude. Enter  Pub  249  volume  I,  with  the  whole degree  of  LHA  for  REGULUS,  record  Hc and  Zn  (last  block).  (See  fig.  9-19.) Drop  down  Ho  from  above. Find  the  difference  between  Hc  and  Ho (remember  to  use  Ho  MO  To).  In  this example,  Ho  is  more  than  Hc,  so  it’s named  T  for  towards. 267° 00.0' 37°N 40° 23.0' 40° 26.4' T  3.4' Zn Enter  the  Zn  (true  bearing). 264° As  you  can  see,  using  Pub  249  to  determine  a  celestial  LOP  is  a  quick process  compared  to  using  Pub  229.  Keep  in  mind  that  some  amount  of accuracy  is  lost. 9-35

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