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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Ex-Meridian Sight using Inmans
From: David C
Date: 2020 Jun 10, 12:45 -0700
From: David C
Date: 2020 Jun 10, 12:45 -0700
Greg wrote
Compare to a pocket 6" slide rule ex-meridian reduction which isn't quite as precise but darn close. Formula: .52(t)(t)cos Lat cos dec / cos Ho
.52 (11.7)(11.7)(.76)(.92)/(.906) = 54.9' correction to add
24°57.5 + 23° 1.9' + 54.9' = 48° 54.3'
90° - 48° 54.3' = Lat 41° 5.7' S
Amazing!!! My DR lat is 41° 06.5'.
When I use the anti-spoof app I am very happy if the error is <1'. Usually it is greater............
