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Lunar Libration
I have been reading my Astronomy 2016 Australia book, and have come across the term lunar libration. I have googled it and think I understand the different types of lunar libration, but in the book they talk about maximum and minimum. From the context I assume that "maximum libration" is a good time to view the moon (obviously depending on other things like moon phase etc) but I don't actually understand what the maximum and minimum are referring to? Google has not been helpful in this regard. Can anyone explain it to me?
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