삼각형자리, or the Triangulum constellation, is a small constellation located in the northern sky. It is one of the 88 modern constellations and is easily recognizable due to its triangular shape. The constellation is home to several notable stars, including Alpha Trianguli, which is the brightest star in the group. The Triangulum constellation is also significant for its proximity to the Triangulum Galaxy, a spiral galaxy that is part of the Local Group. This galaxy is one of the closest to Earth and can be observed with the naked eye under dark skies. The constellation is best viewed in the fall months.