NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Stereographic Devices
From: George Huxtable
Date: 2010 Apr 14, 23:06 +0100
From: George Huxtable
Date: 2010 Apr 14, 23:06 +0100
Yes. The oldest instrument of all; the astrolabe uses a stereographic projection. George. contact George Huxtable, at george@hux.me.uk or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. ----- Original Message ----- From: "Robin Stuart"To: Sent: Wednesday, April 14, 2010 2:29 PM Subject: [NavList] Stereographic Devices Bowditch (2002 Edition) page 31 states: The principal navigational use of the stereographic projection is for charts of the polar regions and devices for mechanical or graphical solution of the navigational triangle. END QUOTE The devices mentioned would presumably exploit the property of sterographic projection that circles on the sphere remain circles on a planar chart. Does anyone know of examples of such devices? Robin Stuart ---------------------------------------------------------------- NavList message boards and member settings: www.fer3.com/NavList Members may optionally receive posts by email. To cancel email delivery, send a message to NoMail[at]fer3.com ----------------------------------------------------------------