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I sent some of the messages relating to this topic to Corradino
Astengo in
Savona, Italy, and he sent this first reply. I asked his permission to
post it
on MapHist, and he added the 2nd reply and said posting it was fine.
Ed Dahl
*****
Begin forwarded message:
From: [email protected]
Date: December 28, 2011 3:07 AM
To: Ed Dahl <[email protected]>
Subject: RE: Odd Numbers on an Old Wind Rose
Dear Ed,
I agree with Joaquim Alves Gaspar and Wolfgang Köberer. It is an
application of
the "Regimiento", but the figures have been rounded so it is
impossible to say
if it is the original (Evora and Munich) or the one corrected by Pedro
Nunes.
Everything is clearly explained in the book by Joaquim Bensaude,
L'astronomie
nautique au Portugal a l'époque des grandes decouvertes, Berne 1912/17,
reprinted by N. Israel in 1967.
Dino
On Dec 28, 2011, at 10:50 AM, Corradino Astengo wrote:
I agree also with Vladimiro Valerio: the system of the "Regimento" is
the same
as the "toleta", but it is in a way more refined, because you don't
need to
calculate the miles (or leagues) sailed, which is always very
difficult, in
order to know your position. It is sufficient to follow a rhumb and to
calculate your latitude. You might also keep track of the miles sailed
in order
to compare the two different observations, but it is suggested, in
case they are
different, to use the one calculated with the latitude. The
"Regimento" is also a
system to calculate the longitude.
Fernando Colombo at the Junta de Badajoz gave in 1424 a "parecer" in
which he
stated that to resolve the problem of Moluccas it was necessary to
calculate
their longitude and he suggested five different methods to do it, the
first of
them is this one, even if he admits that it is unsafe "por la
imposibilidad que
hay de caminar el navio por reta linea".
Cheers
Dino
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