the dark half of the moon is not visible
craters_of_moon is not visable_to_unaided_eye. everyone has not seen_sun_and_moon darkenness is not dark_or_dimly. moon has no_moon harvest_moon is full_moon. harvest_moon is not full_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.