The Night Skies of August/SeptemberAugust
The bright stars Altair, Deneb, and Vega form a prominent triangle that is well seen on August evenings from all but the most southerly latitudes. In the northern hemisphere, it is known as the Summer Triangle. Another major site for northern observers is the Perseid meteor shower, visible in mid-month.
Days and nights become equal in length as the equinox approaches, around September 23, marking the start of northern fall and southern spring. The Great Square of Pegasus is well placed for observers in northern latitudes, while in the southern hemisphere the brightest stars are in the western sky.