“Pictures” in the sky that ancient astronomers perceived by imagining lines or relations between stars that appear grouped. Often, mythological heroes or creatures were the subjects of the pictures.

Creating the constellations in the sky not only provided storeys for amusement, but also helped people remember the positions of the stars. Knowing the positions of the stars helped farmers keep track of the seasons and travellers keep track of where they were. Modern astronomers define 88 constellations, which are spread across the entire sky.