An Oct. 8, 2014, photo shows the blood moon, created by the full moon passing into the shadow of Earth during a total lunar eclipse, as seen from Monterey Park, Calif. Sky-watchers will get a chance to see another "blood moon" eclipse on Sunday. Nick Ut/AP hide caption

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The "blood moon" eclipse above the Washington Monument just before dawn on the National Mall, in Washington, D.C. Andrew Harnik/The Washington Times /Landov hide caption

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The moon appears red during a lunar eclipse in the Qatari capital of Doha, 28 August 2007. It's going to happen again tonight, and be visible across North America. Karim Jaafar/AFP/Getty Images hide caption

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