1. Agenda Does the moon rotate? Eclipses Tides

2. Mid-term check in On a notecard… What is helping you learn the most in this class? What is helping you learn the least? What one thing would you change about this class?

4. The same side of the moon always faces us. Therefore A. The moon does not rotate on its axis B. The moon does rotate on its axis

6. If you lived here… How often would the Sun rise? How often would the Earth rise? How often would you see stars?

7. If you lived here… How long would a day last? How long would a night last?

8. Solar and lunar eclipses

9. Solar eclipse

10. Types of solar eclipses Total solar eclipse NASA

11. Types of solar eclipses Annular eclipse NASA

12. Total solar eclipse

13. Annular solar eclipse

14. Lunar eclipse

16. Why don’t eclipses occur every month?

17. Size and distance to scale! Actual tilt of the Moon’s orbit Moon Earth line to the Sun

18. What causes tides?

19. To moon The moon’s gravity distorts the oceans. Tides occur twice a day!

20. Low tide

21. High tide

22. What about the Sun? Spring tide Sun, moon in a line Neap tide Sun, moon at right angles

23. What is the phase of the moon on this day? A. New or full B. ¼ or ¾ C. Waxing D. Waning E. Can be any phase Spring tide Sun, moon in a line

24. Of course, the Earth is not all water Land masses stop water flow Friction between oceans and floor Depth of ocean varies The Earth rotates

25. Not all surf is created equal

26. Summary Lunar eclipses: Sun-Earth-Moon Solar eclipses: Sun-Moon-Earth Phases of the moon  From above the solar system, looking south

27. What is a haiku? 3 line poem:  Line 1 – 5 syllables  Line 2 – 7 syllables  Line 3 – 5 syllables Does not have to rhyme

28. On a note card write 3 haikus Eclipses Tides Gravity 575575

29. More on phases of the moon

30. Example: how does this look from above the solar system? The moon is overhead at 3 am It rose around 9 pm It will set around 9 am

31. It’s 3 a.m. E W The moon is overhead

32. Rose at 9 pm E W

33. How does this look outside? It rose around 9 pm

34. Example What time is it? How does the moon look?

35. How does this look outside? It will set around 9 am

36. One month…

37. More on tides… Largest tidal range: 50 ft (East coast of Canada) Typical range: 5-10 ft Moon’s tidal strength is about 2 times that of the Sun These forces actually cause the Earth and Moon to change shape!