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