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    Re: Bubble Sextants and Celestial Calculators
    From: Ken Gebhart
    Date: 2008 Sep 10, 20:22 -0500

    Yes, we had night vision scopes a few years back, and they worked
    very well.  We loaned one to some classes on tall ships, and the
    students and instructors said they worked well.  The scope was a
    Generation 1, which is all you need. Gens 2 and above are actually
    too bright.  We had to discontinue the line because the Russians
    would not give support nor honor their warranty for defective units.
    On Sep 7, 2008, at 8:41 AM, Robert Eno wrote:
    > Bruce,
    > You have to make a physical correction with the Celesticomp V. You
    > must
    > apply the semi-diameter correction to the intercept. The maker of
    > the unit
    > suggested (when I posed this question to him in a letter several
    > years ago)
    > that the sights be taken as if they were lower limb sights. The semi
    > diameter would subsequently be subtracted from the intercept.
    > As for night vision scopes with a nautical sextant, I believe Ken
    > Gebhart's
    > Celestaire was offering these units at one time. I haven't got one
    > of his
    > catalogues handy so I cannot tell you if this is still the case.
    > Ken will
    > perhaps wade in at this point.
    > Robert
    > ----- Original Message -----
    > From: "bruce hamilton" 
    > To: 
    > Sent: Sunday, September 07, 2008 5:03 AM
    > Subject: [NavList 6227] Bubble Sextants and Celestial Calculators
    >> I was looking at the Celesticomp V and the Star Pilot and was
    >> wondering
    >> if they deal with readings from bubble sextants. Do you have to treat
    >> semi-diameters as errors or can you just set the reading for
    >> center of
    >> the body? I have tried pocket stars on the PC and it can't deal with
    >> bubbles.(A great pity as I like the price). Besides that, it calls
    >> Alkaid by some other name and that gets me worried.
    >> I know I should use nothing but my Nories Tables and my slate, but
    >> I am
    >> a weak man and am often tempted by shiny objects and electronic
    >> gadgets.
    >> I have to give people some idea of what to get me for my birthday!
    >> PS
    >> The ability of the A-12 to superimpose a bubble on the sky is just
    >> brilliant.  I  don't need a horizon and can shoot the stars all
    >> night.
    >> Speaking of which, has any one ever tried a night vision scope on a
    >> nautical sextant?
    >> Bruce Hamilton
    >> Vancouver, BC.
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