<ul><li>Hercules, a faint constellation, contains the easy-to-see Keystone asterism, which is a star pattern situated between the bright stars Vega in Lyra the Harp and Arcturus in Boötes the Herdsman.</li><li>The Keystone asterism can be located by using the star Vega in Lyra the Harp or in conjunction with the star Arcturus in Boötes the Herdsman, about 1/3 of the way from Vega to Arcturus.</li><li>Once the Keystone is found, it can be used to locate M13, also known as the Hercules cluster, a famous globular star cluster in Hercules which appears as a dim smudge or a fuzzy star through binoculars or a telescope.</li><li>The best time to view the Keystone and the Hercules cluster is later in the evening when they swing high overhead after midnight and before dawn in the western sky.</li></ul>

Find the Keystone in Hercules, and the Hercules Cluster M13

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