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    FW: Re: Global oceanic tides,
    From: Bill Noyce
    Date: 2003 Aug 26, 10:09 -0400

    Sure enough, this went just to Geoff.  I hereby send it to
    the list, even though Geoff has already posted the whole
            -- Bill
    -----Original Message-----
    From: Noyce, Bill
    Sent: Monday, August 25, 2003 10:45 AM
    To: 'geoff@BUTT.DEMON.CO.UK'
    Subject: RE: Re: Global oceanic tides,
    Geoff Butt has been calculating NA data, and writes:
    > There are however some minor discrepancies
    > of the magnitude of 0.2seconds in GHA for some bodies which I don't quite
    > understand at the moment
    I wonder if this is because the published NA adjusts the apparent
    position of planets for the "center of illumination", rather than
    the center of mass.  For example, when Venus shows a crescent,
    the NA will tabulate the planet's position as being somewhat closer
    to the sun than it actually is.
            -- Bill

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