when a hemisphere is tilted towards the sun , that hemisphere receives more direct sunlight
sunlight is solar_radiation. hemisphere'pointing_toward_sun is in_summer. humans_darken_when is in_direct_sunlight. humans_darken_when is not in_direct_sunlight. hemisphere'pointing_toward_sun is not in_summer. sunlight has effect_of_heating_earth sunlight is light. direct_sunlight is sunlight. direct_sunlight is not sunlight.