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Motion through the universe

Motion through the universe. Rotation. Results in day/night. 24 hour period (measured by Earth’s equator. Center of Earth is larger at center due to this spinning motion. Precession. Change in Earth’s tilt but NOT its 23.5⁰ angle. Does NOT effect the seasons, only position of stars.

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Motion through the universe

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  1. Motion through the universe

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

  3. Precession • Change in Earth’s tilt but NOT its 23.5⁰ angle. • Does NOT effect the seasons, only position of stars

  4. Precession • Because the plane of Moon’s orbit is tilted away from plane of Earth’s 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 3rd) • Aphelion – farthest away from the sun (July 4th) • Does this match what you would have guessed? Why or why not?

  8. Seasonal Change • More influenced by TILT of Earth’s axis (23.5)

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