18.4 ? Temperature Changes with Latitude and Season Temperature Changes with Latitude The equator receives the most concentrated radiation The Sun strikes the rest of the globe at an angle and thus radiation is less concentrated at higher latitudes The Seasons Solstice ? Either of two times per year when the Sun shines directly overhead and its furthest from the equator Mark the beginnings of summer and winter One occurs on or about June 21 and marks the longest day of the year in the northern hemisphere and the shortest day in the southern hemisphere The other occurs on or about December 22, marking the longest day in the southern hemisphere and the shortest day in the northern hemisphere Tropic of Cancer ? The latitude 23.5o north of the equator On June 21, the summer solstice in the northern hemisphere, strikes Earth from directly overhead at noon at this latitude Casting no shadows Equinox ? equal nights Occurs on March 21 and September 21
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