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From:
www.constellation-guide.com
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The Keystone: Guide to Bright Clusters in Hercules – Constellation Guide
https://www.constellation-guide.com/the-keystone/
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The Keystone is a trapezoid-shaped asterism formed by four relatively bright stars in the constellation Hercules: Pi, Eta, Zeta and Epsilon Herculis. It outlines the torso of Hercules.
