Motion of the earth

A power point that is designed to explain the effects of the Rotation and Revolution on the Earth.
-Day and Night
-The four seasons
-Solstice and Equinox
-High tide and low tide
-Windspeed and Direction

1. Motion of the Earth

2. The earth moves in two different ways: Rotation Revolution

3. ROTATION

4. The earth rotates on it’s own axis. It’s axis is an imaginary line between the North Pole and the South Pole. The axis is tilted.

5. The earth takes 24 hours to complete a full circle. 1,036 miles per hour

6. The Effects of Rotation on the Earth

7. Day and Night As the earth rotates on its axis, half of the earth faces the sun and half of the earth faces away from the sun. The half of the Earth that faces the sun will experience day while the half of the Earth that faces away from the sun will experience night.

8. Image of Day and Night

9. High and Low Tide High and low tide is a result of the gravitational pull between the sun and the moon. When the earth rotates, the sun and the moon pulls it, however, one of the force is usually stronger than the other. Hence, we will experience high and low tide.

10. Image of High and Low Tide

11. Wind speed and Direction Wind on the earth comes from north, south, east and west direction. As the earth rotates on its axis, different places will get stronger surge of wind as a result of the speed of the rotation

12. Image of Wind speed and Direction   Wind speed and Direction are how fast the air is moving and from which direction.

13. REVOLUTION

14. The Earth revolves around the Sun. The Earth takes 365 ¼ days to complete the revolution = a year .  

15. Earth revolves around the sun in a slightly eccentric elliptical orbit once a year. The speed of earth’s revolution is about 18 miles per hour.

16. The Effects of Revolution on the Earth

17. Three factors cause the seasons: The revolution of the Earth around the Sun. The tilt of the Earth’s axis of rotation respects to the Plane of the Ecliptic. The tilt of the Earth’s axis remains constant

18. Revolution causes: - The four characteristic positions of the Earth (summer and winter solstices and spring and autumn equinoxes ) . - The seasons of the year

19. Solstices and equinoxes Solstice : one of two days in the year when the Sun is at its highest or lowest point in the sky at noon (12 pm ) Equinox : one of two days in the year when day and night are the same length of time .

20. Summer Solstice marks the beginning of summer on June 21/22. June 21 is the longest day. When it is summer in the northern hemisphere it will be winter in the southern hemisphere and the sun is directly over the tropic of cancer .

21. Winter Solstice marks the beginning of winter on December 21/22. December 21 is the shortest day. When it is winter in the northern hemisphere it will be summer in the southern hemisphere and the sun is directly over the tropic of Capricorn.

22. Spring Equinox marks the beginning of spring on March 20/21. When it is spring in the northern hemisphere it will be autumn in the southern hemisphere and the sun is directly over the equator.

23. Autumn Equinox marks the beginning of autumn on September 22/23. When it is autumn in the northern hemisphere it will be spring in the southern hemisphere and the sun is directly over equator.

24. Varying Length of Day and Night The effects of revolution causes varying length of day and night. In December the sun is directly over the tropic of capricorn , therefore, there will be shorter days and longer night. In June, the sun is directly over the tropic of cancer, therefore, there will be longer days and shorter nights.

25. During the seasons, temperature changes depend on angle at which the Sun’s rays hit the Earth.