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Henry,

Thanks a lot for your contribution.

> in terms of Longitude, were in the order of within
> 15-minutes of arc, as compared with my known positions
> at the time of observation.

> I appreciate that Alex's interest in Lunars seems to
> be the accuracy of the angular measurement attainable
> with the sextant, a matter of routine to me.

So you attribute most of the 15' error
(which was typical for your observations, as you say)
to the reduction method, use of 5-digit tables etc.?

> 2) For land
> observations, consider mounting his sextant on a tilt
> table or bracket atop a tripod, which allows

This I consider a violation of the rules:-)
If one chooses this way, then why not to use
a 20x scope, and a theodolite, or some other
instrument more accurate than a sextant, after all?
What is special about the sextant, and what makes
it different from other astronomical instruments?
It is hand-held.

My ultimate interest is in the measurement at sea.
Unfortunately I have no possibility to sail very frequently.

Alex.


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