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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Celestial Navigation in the Era of GPS, by George Kaplan USNO
From: Richard B. Langley
Date: 2013 Dec 28, 12:36 -0400
From: Richard B. Langley
Date: 2013 Dec 28, 12:36 -0400
I don't think that's what you meant to say. Equipotential surfaces ARE smooth: "Equipotential surfaces cover the Earth like the layers of an onion; they do not cross each other nor are they parallel to each other, except as a first approximation. They are continuous (ie, they do not have any breaks), they have no sharp edges and are convex everywhere with smoothly varying radii of curvature." They are, however, irregular, unlike the ellipsoid. -- Richard Langley On Monday, December 23, 2013,357, at 4:23 PM, Frank Reed wrote: > the Earth's equipotential surfaces are not smooth ----------------------------------------------------------------------------- | Richard B. Langley E-mail: lang@unb.ca | | Geodetic Research Laboratory Web: http://gge.unb.ca/ | | Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142 | | University of New Brunswick Fax: +1 506 453-4943 | | Fredericton, N.B., Canada E3B 5A3 | | Fredericton? Where's that? See: http://www.fredericton.ca/ | -----------------------------------------------------------------------------