NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Elements of the navigation triangle
From: David Pike
Date: 2018 Oct 29, 02:01 -0700
From: David Pike
Date: 2018 Oct 29, 02:01 -0700
Steve Bryant You wrote:
Is it true that the Co-latitude and the Co-latitude will always be less than 90°? Is it true that the Co-declination may be either less than or greater than 90°?
Steve
I always though co meant 90° minus. If you’re using co-lat in the PZX triangle, then P and Z must be in the same hemisphere. If X is also in that hemisphere, then you need co-dec, which will be less than 90°. If X is in the opposite hemisphere, why not keep it simple and call the third side 90° + dec (which will be more than 90°)? Then you don’t have the problem, or am I way off beam? Wrt altitude, let's not visit the case of X being below the observer's horizon. DaveP
