How often does a full moon lunar eclipse happen?

A lunar eclipse happens when Earth is exactly between the Moon and the Sun (or more correctly, when viewed from the Sun, the Moon passes behind Earth and through its shadow), like this:...

Lunar Eclipses always happen at the full moon because the moon is always the farthest from the sun when there is a full moon. If you go into a dark room and have a light bulb turned on in the middle...

During a lunar eclipse the sun will be in the opposite direction when observing the moon. It's like looking at a book with the light source behind your head, with your head representing the earth....

because the lunar eclipses happen when the Earths shadows fall , hidding it from the suns light.

There are generally two lunar eclipses and two solar eclipses each year. Sometimes instead of one total eclipse, we'll get two partial or penumbral eclipses, but we average two per year. Of those two...