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    Re: CHO-T inverting scope
    From: Alexandre Eremenko
    Date: 2004 Oct 10, 18:57 -0500

    Thank you for the web address of the precise almanac.
    (My conjecture was wrong: the Nav Alm value of Sun SD
    was closer to the truth than my measurement:-(
    On the use of the inverting scope. (I am a beginner,
    SNO-T is my first sextant, and I am learning how to use it).
    As I used both scopes from the very beginning,
    I don't see
    additional difficulties people experience with the inverting
    scope. Why does it matter that the picture is up side down?
    I do not have a natural horizon at this time,
    so I only use the artificial one (Davis) and measure
    star-to-star distances, planning to pass to the Lunar distances
    as soon as I learn other techniques.
    My method is the following:
    a) I bring two images to the field of view
    WITHOUT the scope, and only then use the scope.
    It is not necessary to detach the scope for this:
    the mirrors on SNO-T are so large that you can see everything
    by placing your eye NEAR the scope (on its left side).
    b) for long star distances I pre-calculate them
    (using my Star globe; unlike the star-finder, it permits
    to do this in seconds). Then I pre-set my sextant, and try to catch
    both stars, first looking besides the scope.
    This can be done with the Moon as well.
    Hope this might help.
    On Sun, 10 Oct 2004, Lisa Fiene wrote:
    > I've recently purchased a Soviet Navy 1986 SNO-T sextant,
    > and am seeking
    > help as to how to use the inverting telescope. (!)
    > I'm fine with the
    > other non-inverting telescope, but am totally stumped
    > with this one.  As
    > the optics appear to be far better on the inverting,
    > I would very much
    > like to know how to use is.
    > The instructions, which are in crude Russian/English
    > aren't helpful to
    > me at all.
    > Thanks, Lisa

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