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    Re: Navigation Weekend: summary and thanks
    From: Frank Reed
    Date: 2008 Jun 22, 22:23 -0400

    Ken, you wrote:
    " I did not mean to imply that Bowditch's equations (as presented by Joel)
    would not work at the time of the equinoxes. Its just that I could think of
    one case where if both altitudes were zero (sunrise and sunset) it could not
    work. This is the well known emergency procedure of finding latitude by
    length of day, which gets less accurate as the equinoxes are approached. "
    
    Aha. Yes, I see what you mean now. Fundamentally, it fails for that pair of
    sights (alt=0, azm=90 at sunrise, alt=0, azm=270 at sunset) because those
    sights yield parallel LOPs, both running north-south.
    
     -FER
    
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