How often do lunar eclipses happen?

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    There are three types of lunar eclipses:  Penumbral, Partial, and Total.  A Penumbral lunar eclipse occurs when the moon passes through the earth’s penumbral shadow (these are subtle).  A Partial lunar eclipse is when part of the moon passes through the earth’s numbral shadow.  A Total lunar eclipses happenes when all of the moon passes through the earth’s numbral shadow.  Since the moon passes the earth a a 5 degree tilt, there is not an eclipse every month.  Total eclipses are the ones that people generally cause people to stand outside and observe, as they are most spectacular, and these occur about twice a year. 

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