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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Preston's paper on Lewis & Clark's Navigation
From: Fred Hebard
Date: 2003 Jun 7, 19:29 -0400
From: Fred Hebard
Date: 2003 Jun 7, 19:29 -0400
On Saturday, Jun 7, 2003, at 19:06 US/Eastern, Fred Hebard wrote: > The 45 degree problem wouldn't have arisen early in the journey. Yes, a backsight with an octant would have been necessary near St. Louis on May 21, when the expedition departed. The sun's altitude then would be around 73 degrees, or 146 in an artificial horizon, too much even for a sextant.
