On Saint Patrick's Day, if you were up at sunrise, you saw a full moon. (There's no such thing as a "Green" moon. I just thought that would give us a wee chuckle for St. Paddy's.)
The next full moon is special... and rare. It's will be a "Blood Moon," and it happens on April 15 at 2:46 a.m. It is called a blood moon because it is a full moon that will experience a total lunar eclipse. A lunar eclipse happens when the earth passes between the sun and moon and casts a shadow over the moon. Instead of completely blocking the light of the sun shining on the moon's surface, the shadow of the earth makes the moon look orange and then red at the eclipse maximum.
The next blood moon is also special because it coincides with the beginning of the Jewish Passover. The last time that happened was on April 24, 1967, and some Biblical scholars believe the blood moon signals significant moments in history.