NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
FW: Re: Global oceanic tides,
From: Bill Noyce
Date: 2003 Aug 26, 10:09 -0400
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 thing... -- 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