Originally Posted by
Paul Barnard
Those of us that drive automobiles know this. There is a device called a sun visor attached to the overhead in vehicles. It can be flipped down to provide a positive barrier between the sun and the vehicle operator's eyes. As long as the big orange ball in the sky is above bottom edge of the visor, then the vehicle operator's vision is not impaired at all. Fascinating technology. You should check it out sometime.
Not exactly true. There is a reason cars have big windshields.
Adjust the visor to it's lowest point, and one can dramatically reduce the field of view. The sun's impact will also move as one goes around curves (there was a curve near the crash site). So it could move from behind the visor to behind the mirror which is much less effective in blocking it. Or, from coming in the side to coming in front, so moving the visor or holding one's hand in front of one's face.