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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Latitude by Talcott-Horrebow Method
From: Geoffrey Kolbe
Date: 2018 Nov 2, 23:53 -0700
From: Geoffrey Kolbe
Date: 2018 Nov 2, 23:53 -0700
Brad Morris wrote:
"If we are to believe your data point of 0.1 arcseconds of latitude, then the instrument should be good to sbout 0.01 arc seconds."
Class one geodetic 'astronomical' theodolites such as the Kern DKM 3a and the Wild T4 are the best in accuracy you will get for a portable instrument and they can be read to 0.1 seconds of arc. But given the limitations on timing the observations, getting the instrument level and achieving 0.1 arc second optical resolution with a 60x scope, actual observations never achieved this level of accuracy.
Geoffrey Kolbe
