LUNAR ECLIPSE

The occurrence of natural events is due to partial or entire lunar surface is covered by the shadow of the earth.Well, during the lunar eclipse, the earth was in a position halfway between the moon and sun. These three celestial bodies are located in the same straight line, if you have this
automatically blocked by the Earth's sun. Finally, sunlight can not reach because of blocked by the Earth's moon.

In other words, an eclipse of the moon appears when the position of the moon opposite the sun. But because of the slope field of the moon's orbit to the plane of the ecliptic, it is not any opposition to the moon with the sun will result in the occurrence of a lunar eclipse.
The definition of the ecliptic is a plane edar form an imaginary line into the path trajectories of heavenly bodies around a central point in the solar system.
The intersection area of ​​the moon's orbit to the ecliptic plane will bring 2 pieces of cut points called nodes, that is the point at which the moon cuts the ecliptic plane. This lunar eclipse will occur when the moon is in opposition to the nodes.
Moon takes 29.53 days to move from one point of opposition to the other opposition point. So it should be, if there is an eclipse of the moon, will be followed by a solar eclipse because the two nodes are located on a line connecting the sun with the earth.
Actually, in the event lunar eclipse, the moon is often still visible. Why? Because there is still sunlight that is deflected toward the moon by the earth's atmosphere. And most of the deflected beam has a red light spectrum.That is why at the time of lunar eclipse, the moon will appear dark, copper can be colored red, orange, or brown. Lunar eclipses can be observed with the naked eye and not dangerous at all. Unlike solar eclipses, hazardous when viewed with the naked eye.

 source : http://reyrey.blog.uns.ac.id/2009/12/14/fenomena-terjadinya-gerhana-bulan/