The practice of inventing constellations, those imaginary patterns among the stars, predates recorded history and has been done by people around the world. In 140 CE, astronomer Claudius Ptolemy of Alexandria, in his book, The Almagest, listed 48 constellations which came to be the accepted list throughout the Mediterranean region for the next 1,500 years. Read more
According to Greek mythology, Hercules was born of an affair between the god Zeus and a mortal woman. For that reason, Zeus' jealous wife often tried to get rid of Hercules; however his strength prevailed. The constellation Hercules, despite lacking bright stars, is easy to locate. It's situated between the two brightest stars of the early summer sky: Arcturus, high in the south, and Vega to the east. Look for the distinctive four corner stars, known as the "Keystone" to identify Hercules.
Constellation Mythological Forms Digitally scanned set of engravings from the 17th century Uranographicarum star atlas by Johannis Hevelius.
You can use them in planetarium shows, exhibits, videos, and other non-commercial applications. (Credit the U.S. Naval Observatory and the Space Telescope Science Institute.)
Constellations are just groupings of stars used to identify a region of the sky. Some of our recognised constellations predate written records, and most originally came from the myths and legends of Mesopotamia, Egypt and Greece. A few of the constellations were charted by astronomers as late as 1750. In 1933, the International Astronomical Union specially defined a set of 88 constellations, including their boundaries in the sky. This official definition of our "modern" constellations is used by professional and amateur astronomers today.