the dark half of the moon is not visible
harvest_moon is full_moon. half_moon is phase_of_moon. moonlight is sunlight_reflected_off_of_moon. moon has no_moon dark_spot is dark_albedo_feature. full_moon is phase_of_moon. craters_of_moon is visable_to_unaided_eye. dark_places has no_light everyone has seen_sun_and_moon darkenness is dark_or_dimly.