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Error: B45a Re: Graphical method by Favet / de 'Lisle
From: Hanno Ix
Date: 2011 Apr 19, 08:47 -0700
From: Gary LaPook <glapook@pacbell.net>
To: NavList@fer3.com
Sent: Tuesday, April 19, 2011 12:30 AM
Subject: Re: [NavList] Re: Graphical method by Favet / de 'Lisle
From: Hanno Ix
Date: 2011 Apr 19, 08:47 -0700
Hi - thank you for sending these pages!
First, I wonder what the book's title is you copies those pages of..
Could you please let me know, Gary?
Secondly: the article says the Fave diagram is a stereographic
projection
of the Earth's surface. I cannot see that.
With stereographic projection, the globe is thought of as sitting
on a plane with, say, the South pole touching it.
Then, with this projection, a straight line connects
(i) the North pole,
(ii) the point on the globe's surface to be projected, and
(iii) the point on the plane where the straight line intersects it.
This would be partially consistent by the surrounding
of the pole in the diagram's lower right corner.
But: circles on
the globe's surface yield circles
on the plane when stereographic projection is used. Further, 90 deg
angles on the globe yield 90 deg on the plane with stereographic projection.
This, now, is not the case in Fave's diagram. So, there seems more to it.
What am I missing?
From: Gary LaPook <glapook@pacbell.net>
To: NavList@fer3.com
Sent: Tuesday, April 19, 2011 12:30 AM
Subject: Re: [NavList] Re: Graphical method by Favet / de 'Lisle
Attached are three pages from Bowditch, 1962 ed.
gl
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