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    Re: Calibrating a sextant scale
    From: Ken Muldrew
    Date: 2007 Nov 21, 11:16 -0700

    On 21 Nov 2007 at 13:10, Alexandre E Eremenko wrote:
    
    > Ken,
    >
    > > For example, it would be crazy not to use a motorized equitorial
    > > mount rather than holding the sextant by hand.
    >
    > Holding sextant by hand does not constitute a problem
    > (in my experience). The main problem in my case is SEEING
    > when two stars exactly coincide. The main problem is
    > with the telescope (and eyes:-).
    >
    > Perhaps a very high quality 10x or 12x large diameter telescope
    > will help. My 6x 30mm inverting is by far superior to
    > the standard modern sextants Galileo scopes, but it is not enough
    > to determine the arc correction with star distances.
    > I can also mention capitan Schufeldt (one of the very
    > few researchers
    > of the accuracy of sextant observations whose paper is available
    > to me). He strongly advocates high quality 12x telescopes
    > for very precise observations.
    > He also recommends using younger observers for this purpose:-)
    
    I bet you change your mind after trying to take some handheld shots using
    a 12x scope.  ;-)
    
    But seriously, a good scope, and as much time as you need looking at a
    stationary image of the two stars, and the ability to take sights for
    hours without getting tired will surely improve your results.
    
    Ken Muldrew.
    
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