Would this be clearer as the first two paragraphs of the phase() documentation?
This method calculates the current phase of the moon and its illuminated
fraction. If the time is omitted, the current time of the $moon object
is used.
The phase is returned as a number from 0 to 2 * PI radians, with
0 being New Moon, PI / 2 being First Quarter, and so on. The
illuminated fraction is a number from 0 (New Moon) to 1 (Full
Moon).
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