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Dan W you wrote:
"Is there a slight typo in Frank's final position?  My lines appear to
cross at 69:24W, 38:43N vice his 69:25W, 38:46N.  The 24-25 could
certainly be my line drawing, but the 43-46 seems to not give the
correct answer when plugged back into Frank's lunar reduction web
calculator."

The position fix that I posted was determined by reading directly off a
little two-inch wide plot in a notebook. I had used a bit of code to
generate a random position near the DR and then hide it from me.
Decoded that position was 38d 44'N, 69d 25.5'W. So your plotting was
correct.

"(ver 4 is current?, ver 5 seems to exist but not work, ver 3 also
broken?) (source of calculator available?)"

The version that links from the main page
www.HistoricalAtlas.com/lunars is the current version. If you are able
to find others by varying URLs, they are either obsolete or not ready
for primetime --don't use them. I don't want to make the code available
since there are a few "clever tricks" (from a coding perspective, that
is), however I can answer any questions you may have about how the
calculation works. In general, it's just what you would expect, I
think.

While I'm here, in another post you mentioned Cotter's reference to the
long, excellent article by "Mendoza del Rios" [sic] in the Transactions
of the Royal Society for 1797. I am sure that Cotter never read this
paper since it does not say what he says it says, for one thing, and
for another that's not the author's name. The "del Rios" part is a
Cotter-ism. His name was Jose (sometimes spelled Josef) de Mendoza y
Rios in Spanish language sources and his own pen. Since he spent his
most productive years in England, his name was often anglicized as
"Joseph Mendoza Rios". Other navigation authorities in the era
generally refered to him as "Mendoza Rios". No del! ...The paper is
worthy of a thread of its own...

-FER
PS: I am posting this message from the google web interface, rather
than sending it to the list as an email. Be forewarned: google does not
yet deal with the "NavigateAway" issue. What that means is that if
you're typing a message and you click something that takes you to a new
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clipboard just before posting (or work in a text file).


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