Blue Moon over the Heartland

Blue Moon over the Heartland
On Thursday sky watchers will see something that hasn't happened in the Heartland sky since July of 2004 and won't happen again until December of 2009.  It's called a "Blue Moon" and according to modern folklore, a "Blue Moon" is the second full moon in a month.  May has already had one full moon on May 2nd. The next, on May 31st, is by definition a "Blue Moon." 
Source:  Astromart