1. Motion of Earth Eric Angat Teacher https://www.youtube.com/watch?v=I3RBsOQU71g https://www.youtube.com/watch?v=zJuag32iE6o https://www.youtube.com/watch?v=4whKTDzX82A

2. 1. Describe the Sun’s path on December. 2. Describe the Sun’s path on June.

5. If you have recently driven directly east between 7 to 9 in the morning, as I have, you'll not forget looking directly into the blinding sun. Driving... September-December Glare

6. ARIMER COUNTY, Colo. (CBS4) – The womanwho drove right into a school bus is talking about what she saw the moments before impact.woman Ashlie Dickerson’s car was wedged under the school bus. She says she was driving her normal route to work but she normally doesn’t see a bus in that area. But when turned onto the typical road she takes she said she was overwhelmed by sun glare.car “You’ve got sun right there on the horizon, That’s all I can remember up to the accident,” said Dickerson.

7. 1. Describe the Sun’s path on January. 2. Describe the Sun’s path on June. The Sun is lower on the horizon because the Northern Hemisphere is tilted away from the Sun. The Sun is higher on the horizon because the Northern Hemisphere is tilted towards the Sun.

8. Universe. Earth, or how it works 3. How do we know when a year starts and ends? 4. How are we affected by the precession of the Earth’s axis? 5. What causes the precession of Earth’s axis? 6. What does it mean by eccentricity? 7. What caused the ice age in past?

9. Universe. Earth, or how it works 11min https://www.youtube.com/watch?v=I3RBsOQU71g

10. 3. How do we know when a year starts and ends? Universe. Earth, or how it works By using the sidereal year or the time for the earth to make one complete revolution around the sun, relative to the fixed stars By using the passing of the seasons, solstices, and equinoxes. This is called tropical year.

11. sidereal year the time for the earth to make one complete revolution around the sun, relative to the fixed stars http://zebu.uoregon.edu/~imamura/121/lecture-2/annual.html

12. tropical year The passing of the seasons https://cuscutum.wordpress.com/2012/11/13/persian-calendar-jalalis-calendar/

13. 4. How are we affected by the precession of the Earth’s axis? The northern star changes over time. Right now our northern star is Polaris but someday it will be Vega. 5. What causes the precession of Earth’s axis? Precession is caused by the shape of earth and the gravitational pull of the moon and the Sun.

14. 6. What does it mean by eccentricity? Eccentricity refers to how round or how oval the orbit is (Kepler’s 1 st law). http://www.physics.csbsju.edu/astro/newcomb/II.6.html 7. What caused the ice age in past? The change from the minimum tilt to the maximum tilt. This cycle happens in a 100, 000 year cycle.

15. Size of the Universe https://www.youtube.com/watch?v=zJuag32iE6o

16. Size of the Universe 8. A Universe is made up of _____. A Galaxy is made up of ______. A Solar system is made up of _____ Choices: A. star or stars, planets, moons, asteroids B. galaxies C. nebulae, clusters, Solar Systems

17. Why Does Everything In The Universe Spin? https://www.youtube.com/watch?v=4whKTDzX82A

18. 9. How did the solar system form? After the Big-Bang-The solar system formed from nebula. As the gases cooled they came together and spun in counterclockwise directions forming stars and planets and other celestial objects. Everything in the universe spins. http://hendrix2.uoregon.edu/~imamura/121/lecture-5/lecture-5.html

19. Solar year, 365d.5h.48m.46s. Sidereal year, 365699 Difference, 20m.23s. http://www.physics.csbsju.edu/astro/newcomb/II.6.html