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Annaliesia Salazar

on 17 January 2013

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Transcript of Seasons

By: Annaliesia Salazar Seasons Rotation and Revolution Direct and Indirect Sunlight Earth's Tilt Equinoxes and solstices Northern and Southern Hemispheres There is a distinct and important difference in the concepts of revolution and rotation. Earth rotates on its axis as it revolves around the Sun. It takes 24 hours to make a complete turn, and 365.25 days to make a complete revolution or rotation around earth. As Earth turns around the sun different parts get different amounts of sunlight which causes seasons. When you have DIRECT sunlight you have a warmer climate. When you have an INDIRECT sunlight it has a more humid or cool temperature. For an example the equator gets DIRECT sunlight most of the time. Earth's tilt is 23.5 degrees, and it is what really causes the seasons. As the Earth makes a revolution or a complete turn around the sun, the different hemispheres get different amounts of sunlight which causes summer, fall, winter, and spring. Northern and southern hemispheres are always opposite in seasons. If the northern hemisphere is in winter, the southern is in summer. If, southern is in fall, northern is in spring. At two points throughout the year, the tilt of the Earth’s axis reaches its maximum angle compared to the Sun, and begins to move back the other direction. This usually happens around June 21st and December 21st. These days are known as solstices. As the Earth moves around its orbit, it reaches two points during the year where the tilt of its axis causes it to be straight relative to the Sun. These days are known as equinoxes. During these equinoxes the rays of the Sun shine directly on the equator. This happens on approximately March 20th and September 22nd.
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