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    Re: Lunar distance sights
    From: Alexandre Eremenko
    Date: 2013 Apr 22, 17:54 -0400

    Dear Randall,
    
    1. Your results are within the conditions of the longitude prize
    of queen Anna. The prize condition was to determine the longitude
    to 1/2 degree.
    
    2. Published statistics of Lunar accuracy is scarce;
    I collected some on my web page
    
    http://www.math.purdue.edu/~eremenko/Navigation/Accuracy/accuracy.html
    http://www.math.purdue.edu/~eremenko/Navigation/Accuracy/mylunars
    And other files in the same directory, including Cook's observations in
    Point Venus.
    
    I would say that the best results available for statistics
    (taken in ideal conditons, from land) are somewhat
    better than the statistics you quote, but not by much.
    
    Alex.
    
    > There have been postings about what level of lunar distance accuraccy can
    > be achieved, but I would like to know what level of accuraccy is usable?
    > Better is "better" of course, but at what point is a sight usable?  Of my
    > last 14 lunar sights the average is 0.7' error in lunar distance.   The
    > best were 2 sights at 0.1' and the worst 1.3'.   The average for 7
    > moon-planet sight was 0.7' and for 6 moon sun sight it was 0.5.   Are
    > these good results?  The 30 minutes of longitude error for 1' of lunar
    > distance makes me look disdainfully at my efforts that are not less than a
    > minute.  What's the grading standard gentlemen?
    >
    >
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