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Rotation Results in day/night. 24 hour period (measured by Earths equator. Center of Earth is larger at center due to this spinning motion.

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Presentation on theme: "Rotation Results in day/night. 24 hour period (measured by Earths equator. Center of Earth is larger at center due to this spinning motion."— Presentation transcript:

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2 Rotation Results in day/night. 24 hour period (measured by Earths equator. Center of Earth is larger at center due to this spinning motion.

3 Precession Change in Earths tilt but NOT its 23.5 angle. Does NOT effect the seasons, only position of stars

4 Precession Because the plane of Moons orbit is tilted away from plane of Earths elliptical plane

5 Nutation Wobbling of precession motion (1/2 degree over 18 year period) Due to gravitational pull of the Moon. Can slightly increase or decrease seasonal affects

6 Nutation

7 Revolution (orbit) Occurs approx. 150 million km away Perihelion – closest to the sun (Jan 3 rd ) Aphelion – farthest away from the sun (July 4 th ) Does this match what you would have guessed? Why or why not?

8 Seasonal Change More influenced by TILT of Earths axis (23.5)


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