Thousands of years ago, Chinese astronomers studied the sky using an ancient record of constellations and their coordinates.

The star Polaris marks the North Celestial Pole in our sky, around which all other objects in the heavens appear to rotate.

The magnitude 1.2 star Deneb passed close to the celestial north pole 18,000 years ago according to the University of Illinois Urbana-Champaign, and will again around the year 9,800 CE, at which ...