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Dear Frank,

> It's 60 compared to observations made relative to a
> perfect terrestrial
> horizon.

Let us better compare with ordinary Lunars.
It is less accurate than the ordinarey Lunars by a factor
of two, if the Moon is near zenith.
And by a factor of 4 if the Moon's alt is 30 degrees.

> Just so we're clear, unless
> I'm missing something, your point "b" is
> nothing more than the usual condition for lines of
> position: you get
> better results when the lines of position have a significant angle
> between them.

Yes, this is what I mean by b).

> "Now it is hard for me to believe that one can
> measure distances with 0.1 or even 0.2 accuracy
> permanently and reliably"
>
> Sure you can! :-)

So far I cannot.
I hope we will clarify the reasons after you test
my sextant, and I test my observation skills/abilities
with your sextant.

Alex.


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