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    Re: Global oceanic tides,
    From: Geoffrey Butt
    Date: 2003 Aug 26, 04:46 +0100

     Thanks for the suggestion Bill, I will see whether there is a correlation
     between appearance and the errors.
    
     Bill Noyce wrote:
     " 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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