1. 22.2 – The Earth-Moon-Sun System – Part II

2. Do Now
What causes lunar phases?

3. Do Now What causes lunar phases?
Result of the motion of the moon and the sunlight that is reflected from its surface.

4. Key Word
Perigee
Apogee
Illuminated

5. Vocab Words
Solar Eclipse
Lunar Eclipse

6. Motions of the Earth-Moon System
Earth has one natural satellite – the moon
Moon orbits Earth within a period of about a month.
Perigee – The moon is the closest to Earth
Apogee – The moon is the farthest from Earth
The motions of the Earth-moon system constantly change the relative positions of the sun, Earth, and moon.
This results in changes in the appearance of the moon, called the phases of the moon.

8. http://youtu.be/7vUObZwLJ8A http://www.youtube.com/watch?v=nXseTWTZlks
02/27/12

9. Lunar Motions
Since the moon rotates and revolves every 27 1/3 days, we only ever see one side of the moon.
Only satellites and Apollo missions have ever seen the back side of the moon.

10. Eclipses Eclipses are simply shadow effects. Solar Eclipse
Lunar Eclipse
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Eclipses

11. Solar Eclipse
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When the moon moves in a line directly between Earth and the sun, it casts a dark shadow on Earth.
Moon must be at a new moon phase and the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place.
e2011.html
Next total for North America is August 21, 2017

12. Lunar Eclipse When the moon moves within Earth’s shadow.
When the moon moves within Earth’s shadow.
Moon must be at a full moon phase and the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place.
More common than solar eclipses.
Next total for North America is November 13, 2012

13. Group Activity
On page 626, copy and label Figure 15A.