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For people in some parts of the world, an extraordinary series of lunar eclipses is about to begin. The action starts on April 15th when the full Moon passes through the amber shadow of Earth, producing a midnight eclipse visible across North America. So begins a lunar eclipse tetrad—a series of 4 consecutive total eclipses occurring at approximately six month intervals.  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. "The most unique thing about the 2014-2015 tetrad is that all of them are visible for all or parts of the USA," says longtime NASA eclipse expert Fred Espenak. What is a blood moon and should you be worried? Here are some facts: 1. The term “blood moon” is not a scientific term. The website EarthSky says that to the best of their knowledge, “the use of the term Blood Moon to describe a lunar tetrad is of recent origin. It might have originated with John Hagee ...