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    Re: Silicon Sea: Leg 82 results
    From: Brian Whatcott
    Date: 2001 Dec 16, 9:15 AM

    At 01:07 AM 12/16/01, Paul Hirose's working began:
    
    >Silicon Sea Leg 82 answers. Solution by 10-inch slide rule and
    >mid-latitude sailing. For the Sun lines I used the U.S. Naval
    >Observatory Web page, not having a current almanac. However, I
    >interpolated the coordinates between exact hours to simulate the
    >almanac as closely as possible.
    >
    >Compute course to landfall at Hawaii:
    >
    >19 30 N  destination lat.
    >11 30 N  fix 2001 July 11 0340
    >-----
    >  8 00    DLat (lat. diff.) = 480 min
    >
    >154 45 W  dest. lon.
    >132 30 W  fix 2001 Jul 11 0340
    >------
    >  22 15  DLo = 1335 min
    >
    >15.5  Lm (mid lat) = mean of dest. & fix lats
    >
    >1289  p (departure) = DLo cos Lm
    >
    >  290  C (course) = 360 - arctan(p / DLat)
    >  -11  correction for variation & deviation
    >----
    >  279  CC (compass course)
    >
    >1368 nm  Distance = p / (sin C)
    >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    I found this note was an exceptionally helpful hand-up for a beginner.
    Thanks
    
    Brian W
    
    Brian Whatcott
       Altus OK                      Eureka!
    

       
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