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    Re: sextants on aeroplanes
    From: Gary LaPook
    Date: 2008 Dec 13, 08:16 -0800

    Thanks.
    
    gl
    
    On Dec 13, 1:58�am, Anabasi...@aol.com wrote:
    > Snip
    >
    > Sextants �and quadrants allow a greater
    > range of measurement which might be useful �for lunar distance
    > measurements, horizontal sextant angles for coast wise �navigation and in
    > the rare case of a body within 30� of the zenith with an �obstructed
    > horizon below it but a clear horizon in the opposite direction �in which
    > case the navigator could turn his back to the star and use the �opposing
    > horizon for the sight. (I don't know if this was ever actually �done in
    > real life.)
    >
    > --------------------------------------------------
    >
    > This has been done in practice at sea. �I have done it several times �in the
    > tropics when the sun is high. �Typically because at the regular �azimuth there
    > is a thunderstorm that obscures or muddles the true horizon �but there is a
    > perfectly good horizon 180 degrees out. �Shoot a backsight, �and you are good
    > to go; as long as you remember how to do it. �It is also �in the US Coast Guard
    > tests, but mostly as Hs to Ho reductions.
    >
    > Jeremy
    > **************Make your life easier with all your friends, email, and
    > favorite sites in one place. �Try it now.
    > (http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolco...)
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