the moon from an angle that is partially lit and partially in darkness – giving rise to crescents, half-moons and so on.
when the sun and moon are in the same direction relative to the earth, the sun’s light is shining precisely on the half of the moon that is facing away from us, so we see no moon at all in the night sky. when the sun and moon are opposite each other relative to the earth, the sun’s light is shining precisely on the half of the moon that is facing towards us, and we see a full moon in the night sky. the only exception is when the 