Constellation is a group of stars which do not change their position with respect to each other and always forms a fixed pattern. We can see the constellation "Ursa major" with our naked eyes in April.
Constellations are useful in tracking artificial satellite and in assisting astronomers and navigators to locate certain stars.From the earliest times the star groups known as constellations, the smaller groups (parts of constellations) known as asterism, and also individual stars have received names connoting some meteorological phenomena or symbolizing religious or mythological beliefs. Currently there are 88 recognized constellations.