A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bob Goethe
Date: 2015 Nov 3, 13:55 -0800
There are a lot. In Bowditch, 1977, Volume 1, Chapter 21 has 56 pages describing various sight reduction methods.
It seems like it is inherently complicated to try and figure out your position on the face the earth. There is no one simple, perfect solution to this problem, and people have been playing with different possibilities for the past several centuries.