Rare Total Lunar Eclipse Tetrad Beginning This Month Across US

Sailors watching the sky will see a total lunar eclipse on April 15th in the United States. This is the beginning of a rare tetrad, a sequence of four total lunar eclipses, each six months apart. While this will be one of nine tetrads occurring this century, in the three hundred years between 1600 and 1900, there were no lunar tetrads at all. The total eclipse of April 15, 2014, will be followed by another on Oct. 8, 2014, and another on April 4, 2015, and another on Sept. 28 2015. This video by NASA summarizes what to expect.

A Tetrad of Lunar Eclipses

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