A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed J.
Date: 2020 Apr 11, 12:55 -0700
Here is a more detailed photo. I understand that the purpose must be to relate GHA to LHA for whatever body you are looking at, but it has 4 degrees of freedom so not sure what they meant it to simplify.
Tracy, thanks for those instructions. The Weems and Plath is slightly more simple (just SHA, GHA, and LHA or t to mess with).