The Great Square of Pegasus is one of the highlights of the eastern evening sky in late summer and early autumn. Its four stars are fairly easy to pick out even from the suburbs. The square's brightest star, Alpheratz, actually does double duty. Although it is the brightest star in the classical outline of the flying horse, in modern times it's been pushed into adjoining Andromeda, where it shines as the the constellation's "Alpha" star. This diagram shows the official constellation boundaries, with Alpheratz just across the line in Andromeda.