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    Re: [Fwd: lunars hard to shoot?]
    From: Michael Wescott
    Date: 2000 Sep 11, 2:23 PM

    > > In practice, this is practical on ships and even small boats. Joshua Slocum
    > > (the first around alone sailor) seems to have preferred Lunars to keeping his
    > > Chronometer on time. The drawbacks are in the difficulties involved with taking
    > > three "simultaneous" sights (two altitudes and the angle between them) and in
    > > the calculations involved to reduce the sights.
    >
    > Actually, you don't need to shoot the altitudes. They are only used to provide
    > corrections for reducing the angle between. You can use calculated altitudes and
    > work back to the apparent altitudes, which then provides you with corrections you
    > need to reduce the sight.
    
    You need at least two altitudes for a position.
    
    
    --
            Mike Wescott
            wescott{at}conterra.com
    

       
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