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    Re: Lunar Distances with Alex's SNO-T
    From: Fred Hebard
    Date: 2006 Oct 31, 08:52 -0500

    Alex,
    
    Use the actual pressure.  That is the determinant for the refraction
    correction.  The elevation above sea level has an insignificant
    effect on parallax, when you consider that the radius of the earth is
    about 3400 nautical miles, but significantly reduces refraction via
    the effect on barometric pressure.
    
    Fred
    
    On Oct 31, 2006, at 8:27 AM, Alexandre E Eremenko wrote:
    
    > Related question: the barometric pressure in the refraction formula.
    > Should I use the actual pressure at my observation site,
    > or should I "reduce it to the sea level"?
    > The actual pressure at my site reflects not only the deviation
    > from the standard atmosphere but also my altitude over the sea level.
    >
    > Alex
    >
    
    
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