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"Blood Moon" is a term of folklore with more than one meaning, sometimes referring to any full moon that occurs in October (also known as a "Full Hunter's Moon") and sometimes referring to any total lunar eclipse, during which the moon is likely to turn dark red in color as the earth's shadow crosses its face.
As it happens, there's a total lunar eclipse on April 14-15, 2014, which means we'll experience not only a "Full Pink Moon" (any full moon that occurs in April, per Native American tradition) and a "Paschal Full Moon" (the first full moon after the vernal equinox, per Christian tradition), but also, thanks to the eclipse, a "Blood Moon."
Some Christians attribute prophetic significance to the Blood Moon of April 15, because it will be the first of a lunar "tetrad" four total lunar eclipses in a row, occurring in 2014 and 2015 and because each of those eclipses falls on an important Jewish holiday, Passover or Sukkot (the Feast of Tabernacles).
Could this be a sign of the Apocalypse? Most Blood Moon prophecy advocates Texas megachurch Pastor John Hagee, for one won't commit to specifics, preferring instead to speak in terms of a "world-shaking event" or "the end of an age." Other Christians aren't so sure the Blood Moon tetrad has any biblical significance at all.
Me, I side with the astronomers: "Just the facts, Ma'am."
Read more about it:
• Watch the Moon Turn Red, April 14-15, 2014
• What Is a Blood Moon?
• Pastor Hagee: Blood Moons Point to 'World-Shaking Event'
• Are Blood Moons Biblical Signs?
• The Science Behind "Blood Moon Tetrad" & Why Lunar Eclipses Don't Mean End of the World
• Is There a "Full Pink Moon" on April 15, 2014?