NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Angles without a protractor
From: Lu Abel
Date: 2012 Oct 12, 14:44 -0700
From: Lu Abel
Date: 2012 Oct 12, 14:44 -0700
Re my earlier reply about error increasing and then decreasing until it's zero at 60 degrees, without working the problem through, it's most likely that the error peaks at 30 degrees. It's good to have a feeling for the size of the error. Yes, 4%, but also just over one degree. Not bad for an approximation.
Lu
Lu
From: Alan S <alan202@verizon.net>
To: NavList@fer3.com
Sent: Friday, October 12, 2012 2:31 PM
Subject: [NavList] Re: Angles without a protractor
Sean:Having only a couple of 30-60-90 Degree triangles handy, I checked 30 D and 60 D.The 30 D angle, using your approach, calculated to be 31.25 D, an error of 4%, possibly my manipulations "enhanced" this error.A 60 degree angle came out as 60 D. I assume that the "20", by which the distance between points is multiplied, is a constant of some sort.The whole thing is certainly interesting.Alan
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