Webquest

1. Compare and contrast the geocentric and heliocentric models of the universe. Geocentric is when the earth is the center and heliocentric is when the sun is the then center which we believe in
2. Where, specifically, is the Sun in the geocentric model? it is forth a way from the earth
3. Whose theory had more planets represented: Aristotle's (and Ptolemy's) or Copernicus'? Aristitle's is because he count's the moon


4. Explain what retrograde motion is, and why it occurs. it happens by the orbit
5. Which planet(s) exhibit retrograde motion? Earth and Mars
6. As you can see from the picture, there are two different ways that retrograde motion can appear. Explain what accounts for the difference. by the orbit and the gravity


7. When you spin the Earth on the globe, are you modeling rotation or revolution? revolution
8. Which takes longer, one complete cycle of rotation or revolution? rotation
9. From the perspective of the North Pole, is the Earth rotation clockwise or counterclockwise? How about from the South Pole? Counter for north pole and clockwise for south


10. Diagram Earth as it orbits the Sun. Label the shape its orbit makes, Earth at perihelion, and Earth at aphelion.
11. Does Earth move faster at perihelion or aphelion? Why? the perihelion because you are the the orbit of the sun
12. About how much closer is Earth to the Sun at perihelion than it is at aphelion? (in miles) 91-95


13. When was perihelion in 2003? (date and time)Jan 4 05
14. When will aphelion occur in 2019? (date and time) July 4 22


15. Why do we have seasons? because the way it tiltes
16. As you may recall, the Summer Solstice is on or around June 21 each year. Worldwide (across the northern hemisphere anyway), when is the warmest day of the year? Why?

17. Which star is the North Star right now? polar
18. Which star will be the North Star in 26,000 years? polar
19. What is precession? when it rotates on it's axis

20. Write your own higher-level question about any topic from section 22.3 in your book. Answer your question.