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I re-read the article by Guyou that Frank mentioned and feel compelled to
introduce a few "caveats":

Frank wrote:
"In particular, he discusses the idea of placing much greater emphasis on
measuring short
distance lunars of just a few degrees"

That's not how I would translate that: Guyou says "une �toile... qui ne soit
plus �loign�e... de plus d'une vingtaine de degr�s". Now that is more than
"a few degrees", it's "some twenty degrees". And that would steer a person
away from the pitfall I dropped into reading the article about Photo sextant
sights.

And Guyou continues: "il leur suffira, en effet, d'en prendre une situ�e sur
la perpendiculaire de la ligne des cornes du croissant"
which is precisely the point about the geometry of a close lunar distance
which George pointed out.

Too bad this was not mentioned in the article - but probably not too bad
because it lead to a discussion that I learned from.

Wolfgang


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