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Think About It:. For 1,700 years what did we believe about the Earth and the Sun and their motions? Why did we believe that?. Aim: How do we prove the earth rotates and revolves?. Topic: Unit 8 Astronomy Main Idea: Heliocentric and Geocentric Views.
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Think About It: For 1,700 years what did we believe about the Earth and the Sun and their motions? Why did we believe that?
Aim: How do we prove the earth rotates and revolves? Topic: Unit 8 Astronomy Main Idea: Heliocentric and Geocentric Views
1) What does the word “geocentric” mean? • “earth-centered”; this is the view that the earth is the center of the universe.
What was the “heliocentric view”? • This was the view that the earth and planets revolved around the sun.
2) Why do planets look like they are moving backward at certain points? • At times in our orbit around the sun, we move faster so another planet looks like it’s going backward.
3) What are the two terrestrial motions? • Rotation= the counterclockwise spinning on an axis at a rate of 15 degrees per hour • Revolution= one object going around another (earth revolves counterclockwise at a rate of 1 degree per day)
Why were the pegs knocked down by the Foucault pendulum? • The earth rotated under them; fastest at the equator and slowest at the poles.
