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    Re: No Two-Body Fix Problems
    From: John Karl
    Date: 2009 Nov 5, 18:51 -0800

    Peter,  OK, good.
    I should also mention that there's no need to use the other solutions
    to the inverse cosines in Eq. 7.5a&b (i.e., like 180-A) because those
    solutions just switch (A+B) and (A-B) when substituted into cos(A-B)
    in Eq. 7.5d (maybe this isn't obvious).  But that doesn't matter since
    we're computing both solutions anyhow.
    And I agree that the equations should be perfectly well behaved in all
    practical cases.  They only blow up at 90d declinations, 90d
    altitudes, or zero D12 -- cases that will never occur in practice.
    Also the equations will give the correct result for osculating LOPs.
    In that case B=0, and the two solution for (A+B) and (A-B) will give
    the same answer.
    So these equations should be straight forward to implement in computer
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