A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: William Porter
Date: 2018 Nov 5, 03:02 -0800
If you can pick up a heavy surveying instrument, turn it 180 deg and replace it on its mount to an accuracy of 0.1" of arc, you probably need to increase your intake of alcohol and/or coffee. But phew no need because the telescope of 3" aperture pictured can only resolve 1.5" of arc at the theoretical optimum (Dawes' limit). Even that seems optiimistic for the mount maneuver.