Wondering about Libration.

No, the title didn't say "libation", which means an alcoholic drink, although too much libation may cause you to see some extra librations.  I am only going to talk about librations affecting the moon.

First, in case any of you don't know what librations are, I will copy a definition from the "World English Dictionary" (an on line dictionary) here:

World English Dictionary

libration  (laɪˈbreɪʃən)
— n
1.	the act or an instance of oscillating
2.	a real or apparent oscillation of the moon enabling approximately 59 per cent of the surface  to be visible from the earth over a period of time.
[C17: from Latin librātus,  from librāre  to balance]
li'brational
— adj The moon is tidally locked to the earth, allowing us to see only one side of it.  But because of its libration, or rocking from side to side, we can see much more of it over time.  We can see from slightly different angles.  But, only the astronauts have seen the "dark side" side of the moon, which, by the way is not always dark.  People just started calling the other side, "the dark side" and it stuck.  But although we know a lot about it, and men have walked on it, and left their junk sitting on it, it is still a romantic sight.  Now, have a great day and don't spend too much time howling at the moon, you hear?