How much of the moon reflects the light of the sun?

All of the moon reflects light, but what is visible from earth depends on the moon cycle and the location of the observer. A full moon means the whole side of the moon we see is lit, and the lit portion continues to trail off until the New Moon, which reflects almost no light at all back to earth. We should also note that half the moon is lit up at all times, except during eclipses. It is just that from earth, we see the moon go through phases.