1. The student knows the effects resulting from cyclical movements of
TEK 8.7 Earth Cycles
The student knows the effects resulting from cyclical movements of
the Sun, Earth, and Moon.

2. The student is expected to:
A) Model and illustrate how the tilted Earth rotates on its axis, causing day and night, and revolves around the Sun causing changes in seasons.
B) Demonstrate and predict the sequence of events in the lunar cycle.
C) Relate the position of the Moon and Sun to their effect on ocean tides.

3. Watch This Day and Night
Day to Night
Watch This Day and Night

4. Rotation vs. Revolution
The spinning of a planet, moon, sun, or other object around its axis.
24 hours
Rotates from west to east (Counter Clockwise)
Reason for day and night
One orbit of an object in space around another object in space, such as the moon around the Earth.
365 days
Revolves counterclockwise
Part of the reason for the seasons

5. Axis
An imaginary line passing through the center (from north pole to south pole)of a planet around which the planet spins.
Earth is tilted on its axis 23.5˚
This tilt plays a role in amount of daylight and darkness received and in seasons.

6. Rotation

7. Rotation
23.5˚

8. Polar Day
Midnight Sun

9. Midnight Baseball

10. Polar Night

12. Revolution

13. Seasons
-Caused by the tilt of the Earth and its revolution around the sun.
-some areas of Earth experience 4 distinct seasons (winter, spring, summer, fall)
-other areas experience consistent weather throughout the year (poles, equator).

15. Revolution of the Earth

16. Diagram Time- Draw This

17. Equinoxes Latin aequus = equal nox = night Vernal Autumnal March 20/21
Beginning of Spring
September 22/23
Beginning of Fall
Hours of daylight = hours of darkness

18. Solstices Summer Winter June 21/22 Beginning of Summer
longest day/shortest night
December 21/22
Beginning of Winter
shortest day/longest night

20. Seasons

21. Watch This
Seasons and the Sun

22. Seasons
Seasons

23. Seasons Foldable Total possible points: 25
Label seasons (1pt/ season, total=4pts)
Draw background depicting season (1 pt/season total=4pts)
Label Equinoxes w/dates (1 pts/equinox, 1/date total=4pts)
Label Solstices w/dates(1 pts/solstices, 1/date total=4pts)
20 pts off for no color
Spring
Vernal Equinox
Mar
Show position of Earth during all 4 seasons (1pt/season total=4pts)
Show direction of Earth’s revolution using arrows (1 pt)
Show and label tilt of the Earth (1pt)
Sun on cover (1pt)
Sun inside (1pt)
“Seasons” Title (1pt)

24. Lunar Phases
-Lunar phases are the result of our eyes seeing the illuminated half of the Moon at different times during the month
-cycles through in approximately days
-each phase last approximately 3 days

25. Revolution and Rotation of the Moon
Revolution = 27.3 days
-counter clockwise
Rotation = 27.3 days
WE ALWAYS SEE THE SAME SIDE OF THE MOON!!!!!

27. Waxing Phase -the phase in which the moon becomes more illuminated
-begins with new moon, ends with full moon

28. Waning Phase
-the phase in which the moon becomes less illuminated.

29. Wax On, Wane Off
**** Phases of the moon always Wax (turn on) and Wane (turn off) from RIGHT to LEFT****

30. Crescent
-when a small slice of the moon is illuminated

31. Waxing Crescent

32. 1st and 3rd Quarters When ¼ of the moon is illuminated.
-1st quarter occurs in waxing phase
-3rd quarter occurs in waning phase

33. 1st Quarter

34. Gibbous
Gibbous- (latin “humpback”) When more than ¼ of the moon is visible

35. Waxing Gibbous

36. Full Moon

37. Waning Gibbous

38. 3rd Quarter

39. Waning Crescent

40. 8 Phases of the Moon New moon waxing crescent 1st quarter
waxing gibbous
Full moon
waning gibbous
3rd quarter
waning crescent

41. Diagram Time
**Always begin identifying where the New Moon will be, and move counter clockwise in order**

44. Diagram Time
**Always begin identifying where the New Moon will be, and move counter clockwise in order**

45. Watch This
Watch This!!

46. D O C D O C

47. Tides
-the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth. -occur 4 times a day -every 6 hours

48. Spring Tides Occur during full moon and new moon.
the high tides are very high and the low tides are very low

49. Spring Tide

50. Neap Tides
-occurs during quarter moons -results is a smaller difference between high and low tides.

51. Neap Tide

53. High Tide vs. Low Tide