Anti-glare polarizing sunglasses reduce ground reflected polarized rays. They can be used to locate the Sun even when it is hidden from view by clouds or by the horizon. In this way, they can even do the main task of “sky compass” and similar instruments. Find out how to make it yourself in this project by Industructables.
https://www.instructables.com/id/Locating-the-Sun-by-polarizing-sunglasses/