This word is cool for two reasons:
SYZYGY – has 3 Ys alternating, not to mention a Z. What an awesome scrabble word!
SYZYGY – means
1. An alignment of three objects, for example, sun, moon, and earth during an eclipse.
2. A pair of related things.
The first meaning is celestial so I love it automatically. Yet another word I will have to try to use in a story someday.
[All information once again courtesy of A.Word.A.Day.]
E V Gregory 
would make a great title for a book, or at least a major theme within a book that could have multiple instances of Syzygy in play.
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