1. Earth’s Days Years and Seasons:
Objectives:
Explain the difference between rotation and revolution.
Create a model that shows the position of Earth as it revolves around the Sun during each season.
Cite evidence to support the claim that seasons are caused by the Earth’s axis, not its distance from the Sun.
Essential Question:
1. How are Earth’s days and years related to the way Earth moves in space?
2.How does the tilt of the Earth affects seasons?

2. What is the difference between rotation and revolution?
The Earth’s rotation causes day and night to occur.
The Earth rotates once every 24 hours.
The Earth’s REVOLUTION around the Sun is one year.
Each year is days.

3. Check For Understanding
You are trying to explain the difference between rotation and revolution to your 8-year-old sister. You decide to show them the difference where you represent the earth and a chair represents the sun. Explain how you would move to show her the difference.

4. You are trying to explain the difference between rotation and revolution to your 8-year-old sister. You decide to show them the difference where you represent the earth and a chair represents the sun. Explain how you would move to show her the difference.
A. You would spin around to demonstrate revolution while slowly walking around the chair to show rotation.
B. You would spin around to demonstrate rotation while slowly walking around the chair to show revolution.

5. What causes earth’s seasons?
Earth’s axis is tilted by 23.5° .
Earth revolve around the Sun.
Earth’s spherical shape affect the intensity of sunlight we received.

6. Summer Solstice- Northern hemisphere is pointed towards the Sun
Summer Solstice- Northern hemisphere is pointed towards the Sun. We received more hours of sunlight.
Fall Equinox-
The sun shines equally on the northern and southern hemispheres. Both areas have the same amount of sunlight.

7. Winter Solstice-
Northern hemisphere is pointed away from the sun. We received less hours of sunlight.
Spring Equinox-
The sun shines equally on the northern and southern hemispheres. Both areas have the same amount of sunlight.

8. The part of Earth that is tilted toward the sun changes throughout the year, as shown in the diagram below.
In which position is Earth when the Northern Hemisphere is experiencing summer?
A. position A B. position B
C. position C D. position D

9. What evidence supports the claim that seasons are caused by the Earth’s tilt and not its distance from the sun?
The Earth’s tilt causes some different latitudes to get different amounts of heat.
Hemispheres pointed towards the Sun experience summer.
Hemispheres pointed away from the Sun experience winter.

12. Aphelion Vs Perihelion
Earth revolves around the Sun in an elliptical pattern, which means that there is 1 point of the path when the Sun is at its closest to the Earth (perihelion) and 1 point when it is furthest away (aphelion).

13. Would this have an effect on Seasons?
No because the Earth's surface receives about 7% less sunlight at aphelion to at perihelion, but this is far less than the seasonal variation caused by the tilt of the Earth (23% in each hemisphere).