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phase angle
subjectfact 
phase anglehas definition The angle measured at the center of an illuminated body between the light source and the observer.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:33:31.0
is a kind of angle2001-09-27 09:33:31.0
anglehas unit angle unit2001-09-27 09:33:30.0
numberhas value2001-09-27 09:32:57.0