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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Extremely poor conditions??Atomic Clocks
From: Alexandre Eremenko
Date: 2012 Mar 23, 10:52 -0400
From: Alexandre Eremenko
Date: 2012 Mar 23, 10:52 -0400
David, Thanks for an interesting piece of evidence: > 5000 observations at sea, value differed from tabulated value by more > than 2.5', except for one difference of 10.6'. Unfortunately he does not say what was the SIGN of this difference of 10'6, and what "one observation" exactly means. Our 31 observations or so, were spread over 4 hours, one of these hours after sunset, and the systematic error was almost constant 10'+ something. More presisely, when I corrected for exactly 1 min watch error, the correction was not exactly constant, but the results have no systematic error and have sigma about 2'. > than 30' have been reported and even values of several degrees have been > encountered in polar regions. Again, the sign is unfortunately not stated. > particularly if mirages are present. etc. Everything looked nice and usual with the naked eye. No mirages, and the remote shore looked normal. Alex.
