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    Re: Zero-Altitude Shot
    From: Paul Hirose
    Date: 2019 Sep 11, 09:49 -0700

    Among these 10 examples of my Bygrave sight reduction rules are all four
      possible true/false combinations of (X < 90) and (altitude < 0). Three
    of the examples are below the horizon. All are worked by slide rule.
    
    http://fer3.com/arc/m2.aspx/Bygrave-sight-reduction-slide-rule-Hirose-dec-2017-g40895
    

       
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