what do you already know? the sun has the following effects on earth: heats the earth’s surface...
Post on 16-Dec-2015
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What do you already know?The sun has the following
effects on earth:
Heats the earth’s surface & atmosphere
Lights half of the earth’s surface at a time.
Influences winds & water cycle.
ROTATION
The spinning of Earth on its axis that causes day and night to occur
AXIS
The imaginary line extending from the North Pole to the South Pole going through the center of Earth, which is the center of Earth’s rotation
NUMBER OF HOURS OF DAYLIGHT Depends on location on Earth
The number of hours of daylight received each day depends on the latitude.
The equator receives about 12 hours of daylight all year long
SeasonsAs 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: Summer(Northern HemispherePosition of the Earth is such that the northern
hemisphere is tilted toward the SunSummer Solstice (1st day of summer)
Sun at highest point (over Tropic of Cancer)Most hours of sunlight (longest day)About June 21
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 sunlightAbout March 21
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/flashfiles/earth.swf
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