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In addition wo Fred's remark,
I want to add that a set of prisms gives
you much more flexibility.
My experience shows that stars observations
are less accurate than observations involving Sun.
But with Sun lunars there are many problems,
especially in the Midwest:-)
You need BOTH Sun and Moon unobscured by the clouds,
and of course there are too many blackout days when
the phase of the Moon is not appropriate.

Alex

On Fri, 12 Jan 2007, Fred Hebard wrote:

>
>
> Frank,
>
> Yes it would be easier to use, in my estimation.  You have to tilt
> your head at ridiculous angles to measure lunars or stars, and you
> have to find the dang things in the mirrors.  It's tiring.  The ease
> of use would lead to greater accuracy, in my estimation.
>
> Fred
>
> On Jan 12, 2007, at 1:18 AM, FrankReedCT@aol.com wrote:
>
> > By making observations with each prism, a rough correction table
> > for the sextant's arc error could be constructed. It's a very
> > clever idea, but if you had such a system today, would it be any
> > more useful than ordinary sextant observations (or maybe lunars) in
> > assessing arc error?
> >
>
>
> >


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