1. SEASONS

2. The tilt of the Earth’s axis causes the seasons.
The Earth’s axis is tilted from vertical.

3. The axis always points in the same direction in space.
Also, seasons change depending on the amount of sunlight reaching the Earth as it revolves around the Sun.
The axis always points in the same direction in space.

4. Light covers a smaller area and it is more intense (stronger).
Direct
Indirect
Light covers a smaller area and it is more intense (stronger).
Light is spread over a larger area (scattered) and it is less intense.

5. During our summer the northern hemisphere is tilted toward the Sun.
Summer solstice June 21-22
Direct Sunlight
Direct Sunlight
Direct Sunlight
The hemisphere that is tilted toward the sun receives more direct sunlight. The Sun rays are less scattered and temperatures are higher (warmer).

6. The Sun is visible for 24 hours in the Arctic Circle in June.
The hemisphere that is tilted toward the Sun has longer days and shorter nights.
The Sun is visible for 24 hours in the Arctic Circle in June.
Summer solstice June 21-22

7. Winter Solstice December 21-22
During our winter the northern hemisphere is tilted away from the Sun.
Indirect sunlight
Indirect sunlight
Winter Solstice December 21-22
We are receiving sunlight at an indirect angle. The sun rays are scattered and the temperatures are lower (cooler).

8. Shortest day of the year
Indirect
Direct
Summer Solstice
June 21
First day of Summer
Longest day of the year
Winter Solstice
December 21
First day of Winter
Shortest day of the year
Axis tilted toward Sun
Summer for 3 months
Direct sunlight
Longer days; shorter nights
Warmer temperatures
Axis tilted away from Sun
Winter for 3 months
Indirect sunlight
Shorter days; longer nights
Cooler temperatures

9. During fall and spring the Earth’s axis is parallel to the sun.
Sunlight
Vernal Equinox (Spring) –March 20 Autumnal Equinox (Fall) – September 22
The northern and southern hemispheres get equal amount of sunlight. Temperatures are mild .

10. Axis is parallel to the sun
Vernal Equinox
March 20
First day of Spring
Autumnal Equinox
September 22
First day of Fall
Axis is parallel to the sun
Both hemispheres get equal amount of sunlight
Mild temperatures

11. December 20 Winter Solstice Spins (rotates to the East)
March 20
Vernal Equinox
December 20 Winter Solstice
Spins (rotates to the East)
Direct Sunlight
Indirect Sunlight
June 20 Summer Solstice
September 22
Autumnal Equinox

12. Involves one object
Spins around an axis (an imaginary line that goes down the center of an object)

13. The Earth and the Sun rotate around an axis.

14. Earth rotates on its axis (spins) every 24 hours.

15. Earth completes one Rotation (spin) on its axis once every 24 hrs
Night
Day
Sun Rays
Earth completes one Rotation (spin) on its axis once every 24 hrs

16. REV LUTI N Involves two or more objects
Object moves around a fix point, usually another object
Object follows an orbit or pathway

17. Earth’s Complete Revolution (orbit) 365.25 days
orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit
orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit
Earth’s Complete Revolution (orbit) days

18. Moon’s Complete Revolution (orbit) 29.5 days
orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit
orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit orbit
Moon’s Complete Revolution (orbit) days

19. THE END!

20. THE END!!