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    Re: Brown's Nautical Almanac c.1900
    From: Dave Walden
    Date: 2007 May 03, 08:43 -0700

    "completely useless"
    
    I'm not sure.
    
    If SD is given (it surely must be!), don't we know:
    
    HP=asin(Rearth/Rmoon*sin(SD))
    
    if SD is given to .1', shouldn't HP be good to better than 2 parts in
    600 (0.3%)?
    
    
    
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