A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Sean C
Date: 2016 Aug 27, 19:44 -0700
Oh, and I forgot to mention programs like Stellarium. I believe there is a built-in function to measure the angular distance between objects in the sky. (It used to be a plug-in you had to download separately.) Once you open Stellarium and set it to your location, you simply hit [Ctrl]+[A] and you can click and drag the mouse from object to object to measure the distance.
The "Sight Planner" function of Rodger Farley's free "Celestial Navigation in a Teacup" program has the same feature.