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Lesson 3: How Do Earth and Its Moon Move? By: Mr. Leslie’s Class
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Definitions While orbiting the Sun, Earth also turns on an imaginary line called an axis With each rotation, or turn, on Earth’s axis, there is one period of daylight and one period of night.
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Earth’s Revolution
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Question??? What causes summer days to be long and warm? –The sunlight hits Earth’s surface more directly. –We live in the Northern hemisphere. Which picture shows summer on Earth for the northern hemisphere? Summer for Winter for Northern hemisphere
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Phases of the Moon
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Moon Phases Lunar eclipse – occurs when the Moon passes into Earth’s shadow. Next Lunar eclipse – December 21, 2010
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Moon Phases Solar eclipse – occurs when the moon passes in front of the Earth to block sunlight from reaching Earth. Next Solar eclipse – June 1, 2011
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Definition Revolution – orbits, or trip, around the Sun. –Earth takes 365.25 days to revolve around the Sun. –The moon orbits/revolves the Earth Rotation – The amount of time it takes to for one day to happen. –Earth takes 23 hours and 56 minutes to rotate once.
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Rotation and Revolution PlanetPeriod of Rotation (in Earth hours or days) Period of Revolution (in Earth days or years) Mercury59 days87.9 days Venus243 days225 days Earth23 hours, 56 minutes365.25 days Mars25 hours1.88 years Jupiter9 hours, 55 minutes11.86 years Saturn10 hours, 40 minutes29.46 years Uranus17 hours, 14 minutes84 years Neptune16 hours, 6 minutes164.79 years Inner Planet Revolution
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Question??? What causes planets to have days that are longer or shorter than a day on Earth? –Each planet rotates at a different speed, so it takes more or fewer hours to rotate once.
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Main Idea The movement of Earth and Moon cause changes in seasons, daylight hours, the phases of the moon, and the night sky.
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