NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Northern Limits of Magnetic Compass Usefulness
From: Bob Goethe
Date: 2019 Feb 6, 12:51 -0800
From: Bob Goethe
Date: 2019 Feb 6, 12:51 -0800
>>the shadow of the gnomon point will track along one of the date curves on any given date<<
Well THIS is intriguing, Frank.
My mathematical prowess is confined to doing basic sine/cosine/tangent functions with, generally, straight lines...even if the straight lines are across the face of a sphere.
Am I likely to be able to handle the math to calculate date curves?
Or am I better off remembering Clint Eastwood's line from the first "Dirty Harry" movie? A man's got to know his limitations.
Bob
