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Step 1
Look for the Great Globular Cluster in the early summer months in northern latitudes. It is in what is known as the Keystone of Hercules, a constellation representing the ancient hero. It should be visible by 10:00 p.m.
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Step 2
To find the Great Globular Cluster, first find Hercules. It is located between the bright star Vega in Lyra and Corona Borealis, the Northern Crown. Facing east, look up and seek the brightest star in the sky. This is Vega. Look to the right and you will see the “U” shaped Corona Borealis. In between is Hercules.
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Step 3
Locate the Keystone of Hercules. This quadrangle of stars contains no bright ones but if it is dark enough out, you should be able to make out its shape. The Great Globular Cluster is on the right side of the Keystone. The Keystone is shaped somewhat like a flower pot, with one end longer than the other.
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Step 4
Draw an imaginary line from the bottom right Keystone star to the upper right. The Great Globular Cluster is about two-thirds of the way up this line. Use your binoculars to scan this area for the cluster, also known as Messier object M13.
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Step 5
Keeping your hands steady, begin to sweep the sky slowly in this region. The Great Globular Cluster will appear as a hazy round glow. It is made up of over 300,000 stars, but your binoculars will not be able to distinguish individual stars as the Great Globular Cluster is so far away. You will readily recognize the cluster when you see it. Try not to get frustrated if you do not immediately succeed in finding it.
