Cycles of the Sun Length of Days & Nights Seasons
Length of Days & Nights <ul><ul><li>The Earth rotates on its axis </li></ul></ul><ul><ul><li>A complete rotation takes a l...
Length of Days & Nights <ul><ul><li>The side of the Earth facing the Sun has day </li></ul></ul><ul><ul><li>The side of th...
 
As the Earth Rotates… <ul><ul><li>The side of the Earth in the sunlight spins away and becomes night </li></ul></ul><ul><u...
 
Changing Length of Day & Day <ul><ul><li>The number of hours of daylight received each day depends on the  latitude . </li...
Changing Length of Day & Day <ul><ul><li>The hemisphere that is tilted toward the Sun gets more hours of daylight that the...
 
Seasons <ul><ul><li>The Earth is tilted on its axis </li></ul></ul>
Seasons <ul><ul><li>The tilt does not change – it always remains pointed in the same direction </li></ul></ul>
 
Seasons <ul><ul><li>As the Earth revolves around the Sun, the tilt sometimes points toward the Sun, sometimes away from th...
 
Seasons <ul><ul><li>The hemisphere that is tilted toward the Sun has summer </li></ul></ul><ul><ul><ul><li>Longer days (mo...
Seasons <ul><ul><li>The hemisphere that is tilted away from the Sun has winter </li></ul></ul><ul><ul><ul><li>Shorter days...
Seasons  <ul><ul><li>When the Earth is positioned so that the tilt is neither towards nor away from the Sun, we have Sprin...
 
Seasons: Summer (Northern Hemisphere)   <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted t...
 
Seasons: Fall (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted neith...
 
Seasons: Winter (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted awa...
 
Seasons: Spring (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted nei...
 
Energy from the Sun (Insolation)
 
Summing Up: Winter - Earth tilted away from Sun, fewer hours of sunlight, less direct sunlight (insolation) Spring – Earth...
Watch this animation: http://www.shsu.edu/%7Echm_tgc/sounds/flashfiles/earth.swf
Works Cited <ul><ul><li>http://www.wrh.noaa.gov/hnx/newslet/spring03/dryjanuaries.htm </li></ul></ul><ul><ul><li>http://ww...
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SunCyles_GT

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SunCyles_GT

  1. 1. Cycles of the Sun Length of Days & Nights Seasons
  2. 2. Length of Days & Nights <ul><ul><li>The Earth rotates on its axis </li></ul></ul><ul><ul><li>A complete rotation takes a little over 24 hours (1 day) </li></ul></ul><ul><ul><li>One side of the Earth is always facing the Sun </li></ul></ul>
  3. 3. Length of Days & Nights <ul><ul><li>The side of the Earth facing the Sun has day </li></ul></ul><ul><ul><li>The side of the earth facing away from the Sun has night </li></ul></ul>
  4. 5. As the Earth Rotates… <ul><ul><li>The side of the Earth in the sunlight spins away and becomes night </li></ul></ul><ul><ul><li>The side of the Earth in the dark spins toward the Sun and becomes day </li></ul></ul>
  5. 7. Changing Length of Day & Day <ul><ul><li>The number of hours of daylight received each day depends on the latitude . </li></ul></ul><ul><ul><li>The equator receives about 12 hours of daylight all year long </li></ul></ul>
  6. 8. Changing Length of Day & Day <ul><ul><li>The hemisphere that is tilted toward the Sun gets more hours of daylight that the hemisphere tilted away from the Sun </li></ul></ul><ul><ul><li>Latitudes closest to the equator have less change in hours of daylight </li></ul></ul><ul><ul><li>Latitudes further from the equator have more dramatic changes in hours of daylight </li></ul></ul>
  7. 10. Seasons <ul><ul><li>The Earth is tilted on its axis </li></ul></ul>
  8. 11. Seasons <ul><ul><li>The tilt does not change – it always remains pointed in the same direction </li></ul></ul>
  9. 13. Seasons <ul><ul><li>As the Earth revolves around the Sun, the tilt sometimes points toward the Sun, sometimes away from the Sun, and sometimes neither away nor toward the Sun </li></ul></ul>
  10. 15. Seasons <ul><ul><li>The hemisphere that is tilted toward the Sun has summer </li></ul></ul><ul><ul><ul><li>Longer days (more hours of sunlight) </li></ul></ul></ul><ul><ul><ul><li>Warmer weather </li></ul></ul></ul>
  11. 16. Seasons <ul><ul><li>The hemisphere that is tilted away from the Sun has winter </li></ul></ul><ul><ul><ul><li>Shorter days (less hours of sunlight) </li></ul></ul></ul><ul><ul><ul><li>Cooler weather </li></ul></ul></ul>
  12. 17. Seasons <ul><ul><li>When the Earth is positioned so that the tilt is neither towards nor away from the Sun, we have Spring and Fall </li></ul></ul><ul><ul><ul><li>Moderate temperatures </li></ul></ul></ul><ul><ul><ul><li>Days and nights of similar length </li></ul></ul></ul>
  13. 19. Seasons: Summer (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted toward the Sun </li></ul></ul><ul><ul><li>Summer Solstice (1 st day of summer) </li></ul></ul><ul><ul><ul><li>Sun at highest point (over Tropic of Cancer) </li></ul></ul></ul><ul><ul><ul><li>Most hours of sunlight (longest day) </li></ul></ul></ul><ul><ul><ul><li>About June 21 </li></ul></ul></ul>
  14. 21. Seasons: Fall (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted neither towards nor away from the Sun </li></ul></ul><ul><ul><li>Autumnal Equinox (1 st day of fall) </li></ul></ul><ul><ul><ul><li>About 12 hours of sunlight </li></ul></ul></ul><ul><ul><ul><li>About September 22 </li></ul></ul></ul>
  15. 23. Seasons: Winter (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted away from the Sun </li></ul></ul><ul><ul><li>Winter Solstice (1 st day of winter) </li></ul></ul><ul><ul><ul><li>Sun at lowest point (over Tropic of Capricorn) </li></ul></ul></ul><ul><ul><ul><li>Fewest hours of sunlight (shortest day) </li></ul></ul></ul><ul><ul><ul><li>About December 21 </li></ul></ul></ul>
  16. 25. Seasons: Spring (Northern Hemisphere) <ul><ul><li>Position of the Earth is such that the northern hemisphere is tilted neither towards nor away from the Sun </li></ul></ul><ul><ul><li>Vernal Equinox (1 st day of spring) </li></ul></ul><ul><ul><ul><li>About 12 hours of sunlight </li></ul></ul></ul><ul><ul><ul><li>About March 21 </li></ul></ul></ul>
  17. 27. Energy from the Sun (Insolation)
  18. 29. Summing Up: Winter - Earth tilted away from Sun, fewer hours of sunlight, less direct sunlight (insolation) Spring – Earth neither tilted away nor toward the Sun, equal hours of daylight and night Summer – Earth tilted toward the Sun, more hours of daylight, more direct sunlight (insolation) Fall - Spring – Earth neither tilted away nor toward the Sun, equal hours of daylight and night
  19. 30. Watch this animation: http://www.shsu.edu/%7Echm_tgc/sounds/flashfiles/earth.swf
  20. 31. Works Cited <ul><ul><li>http://www.wrh.noaa.gov/hnx/newslet/spring03/dryjanuaries.htm </li></ul></ul><ul><ul><li>http://www.nasa.gov/worldbook/wbkids/k_dayandnight.html </li></ul></ul><ul><ul><li>http://www.lpi.usra.edu/education/skytellers/day_night/activities/cycle_of_light.shtml </li></ul></ul><ul><ul><li>http://www.nps.gov/lacl/graphics/sun_earth2.jpg </li></ul></ul><ul><ul><li>http://www.learner.org/jnorth/images/imageshtml/earth-tilt.gif </li></ul></ul><ul><ul><li>http://costa-rica-guide.com/travel/index.php?option=com_content&task=view&id=365&Itemid=604&limit=1&limitstart=4 </li></ul></ul><ul><ul><li>http://www.windows.ucar.edu/tour/link=/earth/climate/cli_seasons.html </li></ul></ul><ul><ul><li>http://www.worldbook.com/features/seasons/assets/tilt4.gif </li></ul></ul><ul><ul><li>http://www.springboardmagazine.com/SpringImages/seasons.gif </li></ul></ul><ul><ul><li>http://www.nmm.ac.uk/upload/img/latitude.gif </li></ul></ul><ul><ul><li>http://www.astro.virginia.edu/class/oconnell/astr121/im/hours-of-daylight-v-date.jpg </li></ul></ul><ul><ul><li>http://en.wikipedia.org/wiki/Summer_Solstice </li></ul></ul>

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