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    Re: Lunars calculator
    From: Jim Thompson
    Date: 2005 Apr 2, 06:58 -0400

    Jim wrote:
    >>On page 280 of the Nautical Almanac (2004): "If an error of 0.2' is
    >>significant (then the) expression for the parallax in altitude
    >>for the Moon
    >>should include a small correction OB for the oblateness of the
    >>Earth..."
    
    Frank replied:
    > I realize that you're aware of this, but just to be doubly sure
    > it's worth noting that that correction in the NA is the
    > oblateness for an observed altitude only. For lunars, where the
    > arc is measured at an angle across the sky, the correction is a
    > little different.
    
    I was not clued into that.  Thanks for pointing it out, Frank.
    
    Jim
    
    
    

       
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