1. DO NOW: In your notes Draw this Diagram and label which season the Northern Hemisphere would be in at A,B,C & D

2. Earth Tilt, The Sun and THE SEASONS

3. The earth rotates on its axis.
Rotates = spins.
The earth makes 1 full rotation every 24 hours.

4. We have day and night because of the Earth’s rotation.

5. The axis of the Earth is tilted at an angle of 23. 5 degrees
The axis of the Earth is tilted at an angle of 23.5 degrees. The axis always points towards the North Star.

6. The Earth also revolves around the sun.
The earth makes one full revolution around the sun every 365 days. 365 days = 1 year

7. Earth’s Hemispheres The Earth is split into two hemispheres (halves)
The imaginary line that runs through the middle is called the Equator
The half above the Equator is the Northern Hemisphere (the part we live in)
The half below the Equator is the Southern Hemisphere
Northern Hemisphere
Southern Hemisphere

8. Sun Energy
Because the Earth orbits on its axis, not all parts of the Earth receive the same amount of sunlight. This is why we have seasons!

9. Summer and Winter
Look at this picture. The Northern Hemisphere is slightly tilted away from the Sun so it is Winter there. The Southern Hemisphere is tilted towards the Sun so it is Summer there!
Thinking Question: Can it ever be the same season in the Northern and Southern Hemispheres?
NO! In fact, whatever season it is in the Northern Hemisphere, it will be the OPPOSITE season in the Southern Hemisphere.

10. In other words, the temperature at that location.
Why would it be warmer near the equator and get cooler closer to the poles?
The angle of the sunlight affects the concentration of the sun at that location.
In other words, the temperature at that location.

11. Latitude and the Angle of the Sun
LEARNING OBJECTIVE:
We will learn how the amount of daylight is affected by latitude lines.
Latitude and the Angle of the Sun
The path of the sun through the sky depends upon where you are when you observe it

12. Latitude and the Angle of the Sun
LEARNING OBJECTIVE:
We will learn how the amount of daylight is affected by latitude lines.
Latitude and the Angle of the Sun
As you travel northward from any mid-latitude location, the noon sun will move lower and lower in the sky

13. Latitude and the Angle of the Sun
LEARNING OBJECTIVE:
We will learn how the amount of daylight is affected by latitude lines.
Latitude and the Angle of the Sun
Two Factors determine the amount of sunlight a latitude gets:
The angle at which it hits the Earth.
The hours of sunlight it receives

14. Daylight Hours LEARNING OBJECTIVE:
We will learn how the amount of daylight is affected by latitude lines.
Daylight Hours

15. Earth’s Axis LEARNING OBJECTIVE:
We will learn how the amount of daylight is affected by latitude lines.
Earth’s Axis

16. 3. The Earth’s tilt on its axis and its orbit around the Sun cause the Seasons.

17. Quick Question
What season is it in the Southern Hemisphere? N
SUN S

19. Quick Question
What season is it in the Southern Hemisphere?
SUN N S

21. Practice
Look at the following map of the world. A) Which countries are in the Southern Hemisphere? B) Which countries are in the Northern Hemisphere?
USA
Spain
JAPAN
ARGENTINA
Australia
South Africa

22. Practice
Look at the diagram below. What cities would have the same seasons at the same time?

23. Practice
Look at the following map of the world. Which countries would have the same season at the same time as Argentina?
USA
Spain
JAPAN
ARGENTINA
Australia
South Africa