Changes in Daylight All locations spend 50% of time in daylight & 50% in darkness Daylight equally distributed every day at equator –Distribution becomes more unequal as you move poleward Period of daylight varies throughout the year –Shortest day about Dec 21 (Winter solstice) –Longest day about June 21 (Summer solstice) –Opposite in Southern Hemisphere Day length & solar angle of sun's rays determine amount of insolation received at any location
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