What is Ursa minor used for?

Ursa minor, the nearest constellation in the north celestial pole, Ptolemy and the modern 88 constellations all include Ursa minor. Ursa minor marks the position of the north celestial pole, and Alpha Ursa minor, the brightest star in the constellation, is the current Polaris. Want to see the details, Baidu "Bear Constellation" is looking for Baidu Encyclopedia. It's more comprehensive inside.