What do all constellations have in common?

Answer 1

Northern circumpolar constellations revolve around the north celestial pole in a counterclockwise manner. They never seem to rise or set, in regards to the horizon. Every 24 hours they seem to complete a revolution around Polaris, the North Star. Because the Earth is a sphere, the number of circumpolar constellations that one sees depends on one's location from the North Pole. At the North Pole, every constellation in the night sky is circumpolar. Below the equator, one cannot see a single circumpolar constellation.

These are the common circumpolar constellations of 40-50 degrees N latitude:

Ursa Major

Ursa Minor

Cassiopeia

Cepheus

Draco