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    Re: Lunar Distances with Alex's SNO-T
    From: Fred Hebard
    Date: 2006 Oct 31, 09:17 -0500

    That's correct!  I started looking into this, but gave up.
    Hopefully, the physicists will jump in here.
    
    On Oct 31, 2006, at 8:59 AM, Alexandre E Eremenko wrote:
    
    >
    >
    > Fred,
    > I see, this sounds reasonable.
    > But then I need a barometer, or to correct
    > the pressure from the Weather channel for
    > my altitude, because,
    > if I understand correctly, the pressure broadcast
    > for the weather prediction is reduced to the sea level.
    >
    > Alex
    >
    > On Tue, 31 Oct 2006, Fred Hebard wrote:
    >
    >>
    >>
    >> 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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