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    Re: Question to Frank
    From: Frank Reed
    Date: 2005 Apr 16, 01:52 EDT

    Alex you asked:
    "In your lunars reducing  calculator, which limb of Jupiter is counted, or
    center?"
    
    Center. That's  what's recommended in some of the old navigation manuals, and
    that's how I do  it. I try to place the center of Jupiter's disk right on the
    Moon's limb. (nice  couple of days for Moon-Jupiter sights in the Midwest,
    huh?)
    
    And:
    "BTW, I cannot find any reference to the size of its disc  in the almanac,
    but my impression is that it is very  non-negligible."
    
    Right now it's about three-quarters of a minute of arc.  Yes, it's big. The
    first month I was on this list (Dec '03), I started a thread  with a title of
    something like "Jupiter is Big" discussing lunars with the  largest planet. I
    find I get exceptionally good results with Jupiter, and I  think it has a lot
    to do with that sharp little disk we see through the  sextant's telescope.
    
    -FER
    http://www.HistoricalAtlas.com/lunars
    
    
    

       
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