A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2016 Nov 28, 08:46 -0800
That's the exact same dome refracction table as I posted from the 2017 Air Almanac. The dome refraction is caused by the curveture of the dome which caused the inner and the outer surfaces to not be parallel and this is what causes the refraction. Shooting through normal winshields and aircraft windows (as long as you avoid any curved portion common up by the wing roots) then you have no problem with refraction.