Title

Title

Cycles of the Sun Length of Days & Nights Seasons 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 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 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 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 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 Seasons

The Earth is tilted on its axis Seasons The tilt does not change it always remains pointed in the same direction

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

Seasons The hemisphere that is tilted toward the Sun has summer Longer days (more hours of sunlight) Warmer weather

Seasons The hemisphere that is tilted away from the Sun has winter Shorter days (less hours of sunlight) Cooler weather

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 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

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 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

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 Energy from the Sun (Insolation)

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

Watch this animation: http://www.shsu.edu/%7Echm_tgc/sounds/fl ashfiles/earth.swf 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-ofdaylight-v-date.jpg http://en.wikipedia.org/wiki/Summer_Solstice

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