The documentation for the phase method tells you that it returns a list of two values, and describes what they mean. If it's still not clear to you, I suggest just playing with it a bit - get a month's worth of data from the module and compare to what you can see in the sky or on some random website.
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Re^2: Question about Astro::Coord::ECI::Moon and "phase"
by Cody Fendant (Friar) on Apr 05, 2014 at 02:03 UTC