A series of four total lunar eclipses in a row is called a tetrad, or four Blood Moons. See how lunar eclipse tetrads work in this Space.com infographic.
'Blood Moons' Explained: What Causes a Lunar Eclipse Tetrad? (Infographic)
SPACE.com - 10 Apr 2014 22:03
A series of four total lunar eclipses in a row is called a tetrad, or four Blood Moons. See how lunar eclipse tetrads work in this Space.com infographic.
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