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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Easy Lunars in 1790
From: Fred Hebard
Date: 2006 Apr 27, 15:55 -0400
From: Fred Hebard
Date: 2006 Apr 27, 15:55 -0400
On Apr 27, 2006, at 3:38 PM, Ken Muldrew wrote: > Note: I haven't corrected the data for temperature or pressure (his > altitude above sea level was about 3250 ft.). > > Ken Muldrew. Ken, Depending upon the temperature, pressure can add a fairly significant correction, especially at 3250 ft. Here at 2000 ft one almost drops off the bottom of the Nautical Almanac correction chart. Did Thompson record barometric pressure? I would think he might have done this for height above sea level determinations. If so, I would expect he also would have recorded temperature. Fred Hebard
