A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
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 "