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Earth’s Rotation and Revolution

Earth’s Rotation and Revolution. Earth’s Rotation. Earth rotates (spins) on its own axis. Earth rotates in 24 – hours 12 – hours in the light – we call that day time. 12 – hours in the dark – we call that night time.

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Earth’s Rotation and Revolution

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  1. Earth’s Rotation and Revolution

  2. Earth’s Rotation • Earth rotates (spins) on its own axis. • Earth rotates in 24 – hours • 12 – hours in the light – we call that day time. • 12 – hours in the dark – we call that night time. • Earth rotates from west to east. This means that we spin counterclockwise.

  3. Earth is Titled! • Earth does not go straight up and down. • Earth is titled on its axis about 23o • As Earth rotates on its own axis, it revolves around the Sun. • It takes 365 days for Earth to revolve around the Sun – 1 year. • The way that Earth is tilted makes us have seasons.

  4. Seasons • The seasons happen because of the tilt of Earth’s axis. • The different amounts of sunlight cause different temperatures at locations. • During our summer, the northern hemisphere is tilted towards the Sun. • This makes more direct sunlight, thus, higher temperatures. • During our winter, the northern hemisphere is tilted away from the Sun. • This means less direct sunlight, thus, lower temperatures.

  5. Quick Review • If it is summer in the northern hemisphere, what season would it be in the southern hemisphere? Why? • It would be winter. If the northern hemisphere is pointed towards the Sun, the southern hemisphere must be pointed away from the Sun. When a part of the Earth is pointed away from the Sun, that means less direct sunlight, thus lower temperatures, thus winter.

  6. Equinox • Sunlight shines equally on both halves of the hemisphere. • 2 times a year. • September Equinox • Marks autumn in the northern hemisphere. • Marks spring in the southern hemisphere. • Usually around Sept. 23rd. • March Equinox • Marks spring in the northern hemisphere • Marks spring in the southern hemisphere • Usually around March 23rd.

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