1. Seasons on Earth
Eric Angat
Teacher

2. Leaning away from the Sun.
Sun on the right side.
East
West
Spring
Leaning away from the Sun.
Winter
Summer
Leaning towards the Sun.
Sun on the left side.
Autumn

3. What causes the season?

4. Imagine you are the Earth.
Lean to the north; that is the Earth's tilt.
At the beginning of Summer, you will be leaning towards the Sun.
At the beginning of Autumn, the Sun will be on your left.
At the beginning of Winter , you will be leaning away from the Sun.
At the beginning of Spring , the Sun will be on your right.

5. 23.5O U.S.A. Autralia What is the season in the United States?
What is the season in Australia?
What causes seasons on Earth?
23.5O
U.S.A.
Autralia

6. Distribution of Sunlight on Earth and the Seasons.
Sunlight rays are spread out.
curvature
Sunlight rays are intense.
Sunlight on the curvature is more spread over larger area causing less heat while more intense at and near the equator.
Why it is less sunny at the poles -Because of the curvature of the Earth's surface, the same amount of sunlight is spread over a larger area towards the poles than equator. Thus, polar areas are heated less than the equatorial areas and overall temperature of the Earth is lower at the poles than the equator.  Note: Cooler temperature at the poles are not caused by the greater distance to the Sun than at the equator. The differencein distance to the Sun is insignificant.  Source: Memorie Yasuda.

7. 4. Define solstice and equinox.

8. 5. What is Kepler’s 1st Law? The Earth's orbit is slightly elliptical
( Kepler’s 1st Law), so that the Earth is closer to the Sun at some times, and farther away at others.
Orbits of planets are elliptical or oval
This Kepler’s 1st law!

9. The point in the Earth's orbit when it is as the greatest distance from the Sun is called the aphelion. The point when the Earth is closest to the Sun is called the perihelion.
perihelion
aphelion

10. 1 Earth’s Revolution= 365 ¼ days
6. How long is Earth’s year?
Aphelion
Perihelion
Winter in the USA
Summer in the USA
1 Earth’s Revolution= 365 ¼ days 10

11. 7. Give the dates of the equinoxes and solstices?

12. 8. Which is true about Earth’s motion through space?
The Earth’s revolution changes the Sun—Earth gravitational pull.
The Earth’s rotation causes annual changes in its surface temperatures.
The tilt of the Earth’s axis and its revolution around the sun produces seasons.
The Earth’s precession affects the amount of heat reflected from its surface.

13. Earth’s tilt on the month of June.
24 hours daytime in North pole.
Earth’s tilt on the month of June.
summer
winter
24 hours nighttime in South pole.

14. 9. Areas in the North pole are dark 24 hours during the months of January and February because
A. the northern hemisphere is tilted away
from the Sun.
B. the northern hemisphere is tilted
towards the Sun.
C. the southern hemisphere is tilted away
D. the southern hemisphere is tilted

16. 13. Aphelion is farthest from the Sun.
Earth is 152 million kilometers from the Sun. Occurs in early July The season is Summer.
Perihelion is closest to the Sun.
Earth is 147 million kilometers from the Sun.Occurs in early January
The season is Winter.
10.
11.
12.
13.

17. 14. What is the difference between Solstice and equinox?
The solstice are days of the year with the longest period of day (Summer Solstice) or the longest period of night (Winter Solstice). The equinox is the day in spring and fall that the hours of light and dark are equal.
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