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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: NOW what?
From: Bill B
Date: 2015 Aug 18, 17:54 -0400
From: Bill B
Date: 2015 Aug 18, 17:54 -0400
On 8/18/2015 4:32 PM, Frank Reed wrote: > Exactly. The "geoid", which is the surface that is equivalent to "sea > level" worlwide, has little undulations in it. In my reply to Brad Morris I included the URL www.ngs.noaa.gov/geoid URL for the differences between the geoid and ellipsoidal surfaces mentioned in Calder's book. I'm getting a 404 error for that URL. Another site contains a wealth of information that topic: http://geodesy.noaa.gov/ .
