Altar Constellations are two of the 88 constellations in the night sky. ARA is the constellation of the Altar, which is located in the southern sky and is made up of stars that form a triangle. URSA is the constellation of the Bear, which is located in the northern sky and is made up of stars that form a large circle. Both constellations are visible in the night sky and have been used for centuries by astronomers to help them navigate the night sky.