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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Using any star for a lunar
From: Herbert Prinz
Date: 2005 Apr 6, 03:28 -0400
From: Herbert Prinz
Date: 2005 Apr 6, 03:28 -0400
Alexandre Eremenko wrote: >In spherical geometry, the sum of angles of a triangle >is NEVER 180. It is always more. The excess over 180 is essentially >the area of this triangle. So for small triangles is is close >to 180, as it should be, because they are approximately flat, >while for big ones it is much bigger. >For example, if you mark three arbitrary points on the equator, >you obtain a triangle whose three angles are 180 deg each. > > > > Or you may get a triangle in which the sum of the angles IS 180 degrees?? Herbert Prinz
