Regiment of the North Pole

The Regiment of the North Pole, also known as the Regiment for the North Star, is a medieval astronomy term for a set of rules describing how to find the celestial North Pole according to the position of the pole star Polaris and the "guard" stars β Ursae Minoris and γ Ursae Minoris. It was used during the Age of Discovery when, because of precession, Polaris was much further from the celestial North Pole than it is now.

Source: Wikipedia — Regiment of the North Pole (CC BY-SA 4.0)