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You can see this most clearly if you bring a star to coincidence, as
for index correction determination, and then move the image around in
the telescope.  The apparent side error will change moving side to
side, and,  I suppose, the index error up and down (I don't know
about the index error as I was observing for side error).

Fred

On Nov 22, 2007, at 7:39 PM, Greg Rudzinski wrote:

>
> What happens to an image of a celestial body when viewed off center in
> a sextant scope? I have a bad habit of using the lower half of the
> field of view when taking lower limb observations of the sun. I
> suspect that this increases the observed altitude slightly.
>
> Greg Rudzinski
> >



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