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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.

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Presentation on theme: "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."— Presentation transcript:

1 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.

2 ROTATION The spinning of Earth on its axis that causes day and night to occur

3 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

4 ROTATION 24 HOURS One complete spin/rotation takes 24 hrs

5 North Pole always faces Polaris, the North Star

6 23.5 DEGREES The slant of Earth’s axis, which is 23.5° from vertical

7 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

8 DAYLIGHT HOURS

9 The earth’s tilt on its axis remains constant throughout the year.

10 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

11 Seasons: Summer (Northern Hemisphere Position of the Earth is such that the northern hemisphere is tilted toward the Sun Summer Solstice (1 st day of summer) Sun at highest point (over Tropic of Cancer) Most hours of sunlight (longest day) About June 21

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13 Seasons: Winter (Northern Hemisphere) Position of the Earth is such that the northern hemisphere is tilted away from the Sun Winter Solstice (1 st day of winter) Sun at lowest point (over Tropic of Capricorn) Fewest hours of sunlight (shortest day) About December 21

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15 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 (1 st day of spring) About 12 hours of sunlight About March 21

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19 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

20 Watch this animation: Watch this animation: http://www.shsu.edu/%7Echm_tgc/sounds/flash files/earth.swf http://www.shsu.edu/%7Echm_tgc/sounds/flash files/earth.swf


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