Blue Moon

Saturday night, will fill the sky with only - a supermoon, or more technically "the bottom" of the moon, a Greek term to describe the point when the object closest to the Earth orbit.
Of course, the moon is the same size it always was (about 2150 miles in diameter), but will appear about 14 percent and 30 percent larger than normal brighter as they pass close to Earth, according to the NASA site.
The moon's orbit is not a perfect circle, but is slightly elliptical, "said Manfred Cuntz, director of astronomy and associate professor of physics at the University of Texas at Arlington." And is happening now is the time that the moon is very close to the ground is also a full moon. "
The Cuntz perigree and blue moons do not have much in common - apart from the fact that both are full.
"Some months, 28 days, others 30 or 31. Because the moon's orbit takes 27 days, and we usually have a full moon in one month, but sometimes we have two. This is the case, and the moon the second full-called Blue Moon," he said.http://www.humpunjabi.com