Friday’s Blood Moon: The Longest Lunar Eclipse of the Century

A total lunar eclipse occurs as the full moon is shadowed by the Earth on the arrival of the Winter Solstice, the shortest day of the year, on Dec. 21, 2010 in Truckee, California. Michael Nagle/Getty Images

The moon will transform into a blood red hue this Friday night, July 27, during the longest lunar eclipse of the 21st century.