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Dear Frank,
Are there any sextant experts in Chicago,
to whom I could show my sextant to collimate
and determine the arc non-uniformity error?
I just don't want to send it by mail again,
but Chicago is the place I can easily come to.
Alex.


On Sun, 31 Oct 2004, Frank Reed wrote:

> Alex E wrote:
> "ERD          0.5       0.3'      0.3'      0.3'      0.3
> It look like my sextant has some arc distortion at large arcs.
> I am going to make a table of it using star-to-star distances."
>
> There may be other issues, too.
> Such large angles are difficult to observe
> for a variety of reasons from shaky hands
> to telescope collimation. If there
> *is* arc error, once it's measured,
> it's easy to correct for, of course.
>
> Frank R
> [ ] Mystic, Connecticut
> [X] Chicago, Illinois

   

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