1. THE SUN-MOON-EARTH SYSTEM
CHAPTER 2 LESSON 1
THE SUN-MOON-EARTH SYSTEM

2. I. INTRODUCTION
Why is the sun shaped like this?

3. I. INTRODUCTION
Where is the Earth located in this picture?

4. I. INTRODUCTION
Where is the moon located in this picture?

5. I. INTRODUCTION
What is this event called?

6. A. EARTH & THE UNIVERSE
Earth is one of eight planets orbiting the Sun in our solar system.

7. A. EARTH & THE UNIVERSE
The Sun is one of billions of stars in the Milky Way, which is one of billions of galaxies in the universe.

8. EARTH & THE UNIVERSE

9. A. EARTH & THE UNIVERSE
Objects in our solar system orbit the Sun due to the Sun’s huge mass and gravitational pull.

10. A. EARTH & THE UNIVERSE

11. B. MOTIONS OF EARTH
Although we don’t sense its motion, Earth is moving rapidly through space. 67,000 mph

12. B. MOTIONS OF EARTH
REVOLUTION is the orbit of an object around another object.

13. B. MOTIONS OF EARTH Earth orbits the Sun once every 365.25 days.
We call this one year.

14. B. MOTIONS OF EARTH
What happens with the 1/4th day of each year?

15. B. MOTIONS OF EARTH
ASTRONIMICAL UNIT (AU) - The average distance between Earth and the Sun is about 150 million km.

16. B. MOTIONS OF EARTH
ASTRONIMICAL UNIT (AU) - The average distance between Earth and the Sun is about 150 million km.

17. B. MOTIONS OF EARTH

18. B. MOTIONS OF EARTH
ROTATION - The spin of an object around its own axis.

19. B. MOTIONS OF EARTH This motion causes day and night.
For Earth, a full rotation takes 24 hours

20. B. MOTIONS OF EARTH

21. C. EARTH’S TILT - SEASONS
VIDEO: BILLL NYE EXPLAINS SEASONS

22. C. EARTH’S TILT - SEASONS

23. C. EARTH’S TILT - SEASONS
The cause of seasons on Earth is related to the tilt of Earth’s axis toward or away from the Sun.

24. C. EARTH’S TILT - SEASONS

25. C. EARTH’S TILT - SEASONS
EQUINOX - On two days during the year, Earth’s axis does not tilt toward or away from the Sun.

26. C. EARTH’S TILT - SEASONS
EQUINOX - one at the beginning of the spring and the other at the beginning of the fall.

27. C. EARTH’S TILT - SEASONS
One at the beginning of the spring and the other at the beginning of the fall.

28. C. EARTH’S TILT - SEASONS
SOLSTICE - On two days during the year, Earth’s axis tilts the most toward or away from the Sun.

29. C. EARTH’S TILT - SEASONS
SOLSTICE - One at the beginning of summer and one at the beginning of winter.

30. C. EARTH’S TILT - SEASONS

31. C. EARTH’S TILT - SEASONS

32. D. EARTH’S MOON
The Moon orbits Earth for the same reason that Earth orbits the Sun;
The reason is the force of gravity.

33. D. EARTH’S MOON
VIDEO: FORMATION OF THE MOON

34. D. EARTH’S MOON

35. D. EARTH’S MOON
A collision between Earth and another planet-sized object might have thrown a large amount of debris into orbit around Earth
Gravity pulled together
Forming the Moon.

37. D. EARTH’S MOON The Moon rotates on its axis every 27.3 days.
The moon revolves around Earth in 27.3 days.

38. D. EARTH’S MOON
As the Moon orbits Earth, the visible part of the Moon reflecting the Sun’s light seems to change shape

39. D. EARTH’S MOON
These shapes are called the phases of the Moon.

41. D. EARTH’S MOON
NEW MOON - When the Moon is between Earth and the Sun, the half of the Moon facing Earth is in darkness.

42. D. EARTH’S MOON
Over the next two weeks, we say that the Moon is waxing.

43. D. EARTH’S MOON
When Earth is between the Moon and the Sun, the half of the Moon facing Earth is completely lit up.

44. D. EARTH’S MOON
Over the next two weeks, we say that the Moon is waning.

45. D. EARTH’S MOON
DEMONSTRATION: MOON PHASES

46. D. EARTH’S MOON
VIDEO: PHASES OF THE MOON

49. E. TIDES
TIDES - The daily rising and falling levels of the oceans and other large bodies of water ...

50. E. TIDES
… which are caused by the gravitational pull of the Moon and the Sun.

52. E. TIDES
HIGH TIDES - A bulge of water forms at the two places on Earth that are closest to and farthest from the Moon, and these places have high tides.

53. E. TIDES
The location of the Sun relative to the Moon can cause an increase or decrease in the level of the tides.

54. E. TIDES

55. E. TIDES

56. F. ECLIPSES
ECLIPSE - movement of one solar system object into the shadow of another solar system object.

57. F. ECLIPSES
SOLAR ECLIPSE - people in the Moon’s shadow on Earth see the Moon partially or completely cover the Sun.

58. F. ECLIPSES
SOLAR ECLIPSE – The moon is in between the sun and Earth.

59. F. ECLIPSES
LUNAR ECLIPSE – people on Earth see Earth’s shadow partially or completely cover the Moon.

60. F. ECLIPSES
LUNAR ECLIPSE – Earth is between the Sun and moon.

61. F. ECLIPSES

62. F. ECLIPSES

63. F. ECLIPSES