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Why is the "blood moon" eclipse the 21st century's longest?

Today marks the longest lunar eclipse of the 21st century at one hour and 42 minutes. At its peak, the moon will turn completely red, known as a "blood moon." The eclipse will not be visible in North America, but it will be highly visible in other parts of the globe, including in South Africa, where CBS News foreign correspondent Debora Patta joins CBSN from the Johannesburg Planetarium with astronomer Kobie Van Zyl.
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