Next message: George Huxtable: "Calculating almanac predictions. (was Global oceanic tides)"
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 "
