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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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