2. 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 Key Concepts Sun, Moon, Earth Day, Month, Year Sun and Stars Seasons

3. What does NASA stand for?

4. National Aeronautics and Space Administration

5. People of early civilizations (140 A.D.) believed that _____ was the center of the universe.

6. Earth

7. The early Native Americans who developed a calendar using rocks were the ___________________. A. Aztec B. Iroquois C. Anasazi

8. Anasazi

9. When the shadow is shortest and the sun is at its highest point in the sky, this point is called:

10. Solar Noon

11. Shadows are _____ in the winter and ___________ in the summer.

12. Longer in winter Shorter in summer

13. The Sun is ____ times wider than the Earth. A. 500 B. 109 C. 25

14. Diameter

15. The _____ is about 30 diameters away from the Earth.

16. Moon

17. The Moon is about ___ size of the earth. A.½ B.¼

18. ¼

19. What makes the moon appear to be the same size as the sun even though it is not?

20. The moon is 400 times smaller than the sun but 400 times closer than the sun. This makes it appear to be the same size as the sun.

21. Why is there a leap year every four years?

22. It takes Earth 365 ¼ days to orbit the sun, and our calendar year is only 365 days long. That means that an extra ¼ day is unaccounted for each year.

23. How long does it take the Earth to orbit the sun? A.10 years B.1 year C.1 million years

24. 1 year

25. How long does it take Earth to rotate on its axis?

27. It takes the _____ about 1 month to revolve around the Earth.

28. Moon

29. Define the term rotation.

30. The spinning of an object around a central axis.

31. The orbiting of one object around another is called:

32. Revolution

33. The sun rises in the ______, and sets in the _______.

34. Rises in East Sets in West

35. The sun looks _______ in the sky in summer. A. higher B. lower

36. Higher

37. The sun rises the latest and sets the earliest during what season?

39. The path of the sun in the sky is: a.Ecliptic b.A phase of the moon.

40. Ecliptic

41. The North Star is the star over the _____ Pole.

42. North

43. What causes Seasons?

44. The tilt of the Earth

45. During the winter shadows are usually: A. shorter b. Longer

46. Longer

47. When it is winter in the northern hemisphere, what season is it in the southern hemisphere?

49. Describe the relationship between day and night during an equinox.

50. They are Equal!

51. The Equinoxes occur on the first day of what seasons:

52. Spring and Fall