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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextant certificates
From: Fred Hebard
Date: 2006 Feb 2, 09:10 -0500
From: Fred Hebard
Date: 2006 Feb 2, 09:10 -0500
Is this plus or minus 20" or plus or minus 10"? On Feb 2, 2006, at 8:55 AM, Alexandre E Eremenko wrote: > Ken, > Thank you for reminding us this number 20" approx 0.3'. > It is true, within this margin, the two certificates I obtained > last summer agree: in the sequence of numbers produced by Freiberger, > none is greater than 20". > > On the other hand, for the lunars (which is the primary use of my > sextant) > unknown 0.3' arc non-uniformity is too bad. > So "all practical purposes" by this definition do not include > lunars:-) > > > A > > On Wed, 1 Feb 2006, Ken Gebhart wrote: > >> Just for the record, I did state what the phrase " the error is >> negligeable >> for practical purposes" meant. That is, less than 20 sec error, by >> German HO >> dictate.
