NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John Huth
Date: 2009 Oct 29, 10:39 -0400
For you historians out there, I have a question - well,
actually two somewhat related questions. Jump to the end if you know it all,
where the questions appear.
I work with a Portuguese colleague who is fond of telling me that the
Portuguese knew about the New World before Columbus
and that Columbus really was a spy for Lisbon.
Although I'm happy to entertain thoughts on this conjecture, I have two more
concrete questions for you folks.
In the current issue of National Geographic, there's an article on a Portuguese
shipwreck in Namibia.
It looks like a great find, by the way - several astrolabes. In the
article, there's a map that shows a route taken by their ships around Western Africa, and it swings quite
wide. I don't know if the vessels were typically
lateen rigged or square rigged, but I was impressed how far west the route goes
near the equator. There's a strong equatorial current in that
region, and of course the Trades. Naively I might have thought they
would hug the coast, but I could see some logic in a course that swings far
west, particularly if the vessels couldn't sail close to the wind. I'm
thinking mainly about the latitudes south of the Canaries and crossing the
equator. In the case where the vessels swing to the west, there have
been assertions that storm-blown vessels made landfall in what is now Brazil.
I do know that Columbus, on his third voyage,
had in the back of his mind the notion from Don Joao of Portugal the idea that there was a continent
between Europe and Asia, which leads some
credence to my colleague's assertion.
The second, only peripherally related question has to do with finding place
names from the Marseilles
tables. I have a paper from 1923 where the author has examined the Toledo and Marseilles
latitude/longitude tables, dating from roughly the 12th-13th
centuries. I'm assuming that most of the tabulated data are for the
purposes of astrology, as opposed to navigation, but it makes for interesting
reading. In the tables, there are many place names that I cannot
recognize, although with a lot of digging I could recognize some.
E.g. I associated Iceland
with "Tule", which seems logical, but many names evade me. One
in particular is "Sigdemessah". This is north of
"Gana", and south of "Corduba", and roughly at the same
longitude.
So...questions:
1.) What evidence is there for Portuguese vessels sailing on a far west path
around West Africa - getting close to what is now Brazil?
2.) Any idea what modern town Sigdemessah might be? Timbuktu?
Thanks!
John Huth
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