NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Advancing a position circle?
From: Peter Fogg
Date: 2006 Jun 17, 18:05 +1000
From: Peter Fogg
Date: 2006 Jun 17, 18:05 +1000
> Alexandre says: > Sure. If you travel 60 miles, the new position line will differ > from a circle by a few miles. I can understand a slight distortion of the circle moved closer to the poles due to the globe not being a perfect sphere. This discussion seems to have focused on the agreed fact that a circle moved across the globe is distorted; with much fascinating detail, such as a J curve surrounding a pole (reminds me of the J curve in economics) but so far seems frustratingly vague about just HOW this happens. Why is it most marked at, for example, 135 degrees? Presumably there is more to it than the flattish-poles, if: > > discrepancy from a circle is not by an infinitesimal amount, either. > > but by something over 14 miles, after a shift of only 60 miles. ?
