Ch 24 2

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Ch 24 2

  1. 1. Ch 24-2 Sun and seasons
  2. 2. Earth <ul><li>The Earth moves in two ways </li></ul><ul><ul><li>Rotation – the Earth’s spinning on its’ axis </li></ul></ul><ul><ul><ul><li>This causes day and night </li></ul></ul></ul><ul><ul><ul><li>Takes 24 hours to complete </li></ul></ul></ul><ul><ul><li>Revolution – Movement around the sun </li></ul></ul><ul><ul><ul><li>This causes the seasons </li></ul></ul></ul><ul><ul><ul><li>Takes 365 1/4 days to complete </li></ul></ul></ul>
  3. 3. Latitude Zones <ul><li>Latitude measures degrees north and south of the equator </li></ul><ul><ul><li>0 degrees is equator, 90 degrees are the poles </li></ul></ul><ul><ul><li>Three regions </li></ul></ul><ul><ul><ul><li>Tropics below 23.5 degrees north and south </li></ul></ul></ul><ul><ul><ul><li>Temperate between 23.5 and 66.5 degrees </li></ul></ul></ul><ul><ul><ul><li>Polar above 66.5 degrees </li></ul></ul></ul>
  4. 5. Seasons <ul><li>The Earth’s axis is tilted 23.5 degrees. </li></ul><ul><li>As Earth orbits the sun its axis changes relative to the sun </li></ul><ul><li>At some point the sun is closer to the north tropic line (our summer) and southern tropic (our winter) </li></ul><ul><li>The seasons are caused by the tilt of the Earth’s axis as it moves around the sun. </li></ul>
  5. 7. Seasons <ul><li>Solstice occurs twice a year when the sun is directly overhead of 23.5 degrees </li></ul><ul><li>June 21 summer solstice longest day of sun, December 21 winter solstice shortest day of sun </li></ul><ul><li>Equinox occurs twice a year when the sun is directly above the equator. </li></ul><ul><li>March 21 spring equinox, September 22 is Autumn equinox </li></ul>

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