2. Why do we have seasons? Because of the tilt on our axis!!!!!!!
NOT our distance to the sun

3. SUMMER
WINTER

4. Dates to Remember

5. Angle of Incidence

7. What is the difference between rotation and revolution?
Rotation = spinning around its axis
Earth’s Period of Rotation = 24 hours
Causes day and night (rise and set of sun, moon, and stars)
Revolution = orbiting an object
Earth’s Period of Revolution = 365 days 6 hours 9 min
Causes yearly changes (seasons, variations in number of daylight hours) because of our tilt

8. Exit Questions 1. Axis A. 23.5 degrees
2. Perihelion B. closest to the sun
3. Revolution C. 1 day (24 hours)
4. Aphelion D. 1 year (365 ¼ days)
5. Rotation E. farthest from the sun
6. Tilt F. imaginary line that runs from pole to pole around which we spin

9. The MOON

10. Lunar Motions Moon Phase Cycle (Synodic Month) = 29 ½ days
Moon Revolution (Sidereal Month) = 27 1/3 days
Moon Rotation = 27 1/3 days
Daytime Temperature = 127 degrees Celsius
Night Temperature = -173 degrees Celsius

11. Properties of the Moon
Diameter = 3,475 km (1/4 the diameter of the Earth – unusually large)
Density = 3.3 g/cubic centimeter (Earth’s is 5.5)
Gravity = 1/6th of the Earth
Moon has no atmosphere or water

12. Lunar Surface
Marias (seas) = dark, relatively smooth areas, ancient lava flows
Regolith – layer of dust on the lunar surface that formed from the meteorite impacts
Highlands = light colored, mountainous areas that are heavily cratered

13. Formation of the Moon Impact Theory:
A mars sized object collided with the Earth
The material ejected from the surface of the Earth became the Moon.
This explains…
Why does the Moon have a much lower density than the Earth?
Why does the Moon not have any water?

14. Moon motion model lab Perigee – moon closest to the Earth
Apogee – moon farthest from the Earth

15. Mimas (saturn)

16. Titan (saturn)

17. Triton (neptune)

18. Europa (jupiter)

19. Miranda (Uranus)

20. Io (Jupiter)

21. Phobos and Deimos (Mars)

22. Our Moon

23. More Moon Fun

25. Distance to the Moon Perigee – 221,519 miles Apogee – 252,712 miles
Avg. Distance ,700 miles

27. Moon Phases Sidereal Month – moon revolution – 27 1/3 days
Synodic Month (moon phase cycle) – 29 ½ days
ALWAYS STARTS WITH A NEW MOON

28. Moon Phases The changing appearance of the moon as seen from Earth
CAUSED BY…the changing position of the moon relative to the Earth and the Sun

29. Moon Phase Cycle

30. Go Over the last unit test

31. Do Now: Identify Each Moon Phase
1) _________________
2) _________________
3) _________________
4) _________________

32. Moon Phase Calendar Activity

33. Solar Eclipse Sun-Moon-Earth
Moon is 1/400 the size of the sun and 1/400 the distance to the sun making them look identical in size
Umbra – complete shadow
Penumbra – partial shadow

34. Lunar Eclipse
SUN-EARTH-MOON

35. Tides Periodic rise and fall of sea level
High Tides occur every 12 hours and 25 minutes (24 hour 50 minute cyle)
Direct Tide – moon pulls the oceans toward it
Indirect Tide – less pull on opposite side causes another bulge

36. TIDES
Spring Tide – cumulative gravitational pull of the moon AND sun on our oceans. Tides are much Higher and lower than usual. Occurs every Full and New Moon

37. TIDES
Neap Tides – occur during 1st and 3rd quarter moon phases in which the moon is at a right angle to the Earth compared to the sun. Tides are much LESS strong