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How does the Earth move?

How does the Earth move?. Input: Left Top. Draw a picture of the 2 main motions of the Earth ( rotation and revolution ). So what does precession look like?. http:// www.youtube.com / watch?v =0qHjtp4cdCA. The Earth’s axis is tilted at a 23.5º angle

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How does the Earth move?

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  1. How does the Earth move?

  2. Input: Left Top • Draw a picture of the 2 main motions of the Earth (rotation and revolution).

  3. So what does precession look like? • http://www.youtube.com/watch?v=0qHjtp4cdCA

  4. The Earth’s axis is tilted at a 23.5º angle • Precession: thechange in direction of the Earth’s axis, but without any change in tilt -Like the wobbling motion of a spinning top • 1 precessional cycle: approximately 26,000 years • Minor effect on the seasons

  5. The North Star • Our North Star is currently Polaris • Because of precession, in 13,000 years our North Star will be Vega

  6. Nutation: The wobbling/swaying motion during the precession of our axis. • This causes a 1 degree change in the tilt of the Earth’s axis. • No effect on the seasons

  7. Output (Left Bottom) • Reflect on what we’ve learned today by finishing the following sentences. • Today, I learned … • I was surprised to find … • I wonder what would happen if… • The important thing about …

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