It is an imaginary equilateral triangle drawn on the celestial sphere, with its defining vertices at Sirius, Betelgeuse, and Procyon, the primary stars in the three constellations of Canis Major, Orion, and Canis Minor, respectively.
É un triángulo equilátero imaxinario debuxado na esfera celeste cos vértices definidos por Sirius, Betelgeuse e Procyon, as estrelas primarias nas tres constelacións de Canis Major, Orión e Canis Minor respectivamente.