1. Caused by Earth’s 23.5o tilt as we revolve around the sun.
SEASONS
Caused by Earth’s 23.5o tilt as we revolve around the sun.

2. At which position is Earth’s orbit around the sun fastest?
The diagram shows a model of Earth’s orbit
around the Sun. Letters A, B, C, and D represent Earth’s position at the beginning of each season.
At which position is Earth’s orbit around the sun fastest?
(1) A (2) B (3) C (4) D
We are closest to the sun in January!

3. N N S S
23.5o tilt causes maximum insolation at Tropic of Capricorn in December and Tropic of Cancer in June.

4. This also causes changing length of daylight and darkness during the year, except at the Equator.

6. Equi = Equal nox = night
Sun at zenith over Equator

7. Let’s Draw!
EQUINOX N
Axis of rotation
INSOLATION
Equator S

9. Sol = Sun stice = standing
Sun at zenith over Tropic of Capricorn
Sun at zenith over Tropic of Cancer

10. Let’s Draw! N Eq S
WINTER

12. Let’s Draw! N S Eq
SUMMER

16. from above the North Pole.
The diagram shows a model of Earth’s orbit
around the Sun. Letters A, B, C, and D represent Earth’s position at the beginning of each season.
In which orbital position would Earth be illuminated as shown?
(1) A (3) C
(2) B (4) D
Viewed
from above the North Pole.