1. Chapter 3 : Lesson 1 Earth-Sun Relationships

2. Essential Question:
How do the relationships between the Earth and the sun affect climate?

3. Climate vs. Weather
Weather: condition of the atmosphere in one place during a limited time

4. Climate vs. weather
Climate: weather patterns of an area over a long period of time

5. The most important factor of climate is Earth’s position in relation to the sun

6. Axis: imaginary line runs from pole to pole, through center
Earth’s Tilt
Axis: imaginary line runs from pole to pole, through center
Tilted at 23 ½ º angle
Places receive diff. amounts of light at diff. times

8. Areas with direct sunlight warmer temps. (Tropics, Equator)
Earth’s Tilt
Areas with direct sunlight warmer temps. (Tropics, Equator)
Areas with indirect sunlight cooler temps. (High latitudes/ mid-lat)

9. Earth rotates on its axis
Earth’s Rotation
Earth rotates on its axis
One complete rotation = 24 hours
From west to east, one hemisphere at a time

10. As it rotates, Earth revolves around the sun (365 days)
Earth’s Revolution
As it rotates, Earth revolves around the sun (365 days)
Tilt + Revolution = seasons
As in length of days and temp.
Reversed for N & S hemispheres

12. Equinox: Spring and Fall Solstice: Summer and Winter
Equinoxes & Solstices
Equinox: Spring and Fall
Equal days and nights
Solstice: Summer and Winter
Longer day or shorter day

13. Spring equinox March 21- rays hit Equator directly…equal day/night
Equinoxes & Solstices
Spring equinox March 21- rays hit Equator directly…equal day/night
Summer solstice June 22- rays hit Tropic of Cancer…longest day (US)

14. Fall equinox Sept. 23- rays hit Equator directly…equal day/night
Equinoxes & Solstices
Fall equinox Sept. 23- rays hit Equator directly…equal day/night
Winter solstice December 22- rays hit Tropic of Capricorn…shortest day (US)

16. So if it is summer in Houston, what season is it in South Africa?
Equinoxes & Solstices
So if it is summer in Houston, what season is it in South Africa?
If we are wearing long sleeves and jackets, what are they wearing in China?

17. “lands of the midnight sun”
The Poles
For 6 months one pole is pointed toward sun  constant sunlight
Other is pointed away little to no sunlight
“lands of the midnight sun”

18. Midnight Sun: Continuous daylight, a time when the sun is visible at midnight during the summer in either the Artic or Antarctic Circle

20. The perfect balance must be kept:
The Greenhouse Effect
The perfect balance must be kept:
Too much heat escapes freeze
Too much heat is trapped dry out

22. Review Question:
Chapter 3 : Lesson 1
Read pages and answer Review Questions on page 63 Hand in Google Class Room.