23 (Northern Hemisphere tilts away from sun) Winter To Polaris Spring (sun aims directly at equator) Summer (Northern Hemisphere tilts toward sun) Fall (sun aims directly at equator) Figure 8.8 The seasons (shown for the Northern Hemisphere) are caused by variations in the amount of incoming solar energy as Earth makes its annual rotation around the sun on an axis tilted by 232°. During the Northern Hemisphere winter, the Southern Hemisphere is tilted toward the sun, and the Northern Hemisphere receives less light and heat. During the Northern Hemisphere sum- mer, the situation is reversed. The satellite images clearly show the significant difference in illumination angles in December, September, and June. National Weather Service-NOAA National Weather Service-NOAA National Weather Service - NOAA

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