These Are the Best Times to See the Longest Total Lunar Eclipse of the 21st Century

Less than a year after the 2017 solar eclipse created a path of totality across the United States, the longest total lunar eclipse of the 21st century will be visible across much of the world on Friday, July 27.

Sometimes called a blood moon, a total lunar eclipse occurs when the Earth moves directly between the sun and the moon. Earth’s shadow moves over the moon, blocking the sunlight that ordinarily reflects off its surface and giving it a reddish glow.

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