1. Chapter 4 - Space Lesson 17: Earth Movements – Rotation and Revolution

2. Objective The student will differentiate between the Earth’s rotation and revolution. The student will differentiate between the Earth’s rotation and revolution.

3. Main Idea The planet Earth is constantly moving through space. The Earth spins on its axis and moves around the Sun. The planet Earth is constantly moving through space. The Earth spins on its axis and moves around the Sun. In this lesson, you will learn more about Earth’s motions. In this lesson, you will learn more about Earth’s motions.

4. Earth’s Rotation From Earth, it appears that the sun rises in the east and sets in the west. From Earth, it appears that the sun rises in the east and sets in the west.

5. Earth’s Rotation This is because of Earth’s rotation, or spinning. This is because of Earth’s rotation, or spinning. Earth spins on its axis. You can imagine the axis as a pole that goes from the North Pole to the South Pole Earth spins on its axis. You can imagine the axis as a pole that goes from the North Pole to the South Pole

6. Earth’s Rotation Earth makes one complete rotation, from east to west, in 24 hours. The time it takes for Earth to spin once around on its axis is called a day. Earth makes one complete rotation, from east to west, in 24 hours. The time it takes for Earth to spin once around on its axis is called a day.

7. Earth’s Rotation As the sun sets in the west, the sun disappears from view in your part of the world. As the sky darkens, you can see many other objects in the sky such as stars, planets, and moons. As the sun sets in the west, the sun disappears from view in your part of the world. As the sky darkens, you can see many other objects in the sky such as stars, planets, and moons.

8. Earth’s Revolution As you know, the stars in the sky make patterns called constellations. As you know, the stars in the sky make patterns called constellations. The stars have been in the same positions in our visible sky for thousands of years. But not all of the stars are visible at the same time. The stars have been in the same positions in our visible sky for thousands of years. But not all of the stars are visible at the same time.

9. Earth’s Revolution If it is early spring, then you may not be able to see Orion in the night sky. If it is early spring, then you may not be able to see Orion in the night sky.

10. Earth’s Revolution This is because of Earth’s revolution. This is because of Earth’s revolution. Earth makes one revolution around the sun every 365 days. The time to make one full revolution around the sun is what we call a year on Earth. Earth makes one revolution around the sun every 365 days. The time to make one full revolution around the sun is what we call a year on Earth.

11. Earth’s Revolution

12. Different constellations and different parts of the night sky are visible during different parts of the year. These differences are what inspired the different signs of the zodiac. Different constellations and different parts of the night sky are visible during different parts of the year. These differences are what inspired the different signs of the zodiac.

14. Earth’s Seasons In one year, Earth goes through four seasons. In one year, Earth goes through four seasons. The seasons on Earth are due to a tilt in Earth’s axis and Earth’s revolution around the sun. The seasons on Earth are due to a tilt in Earth’s axis and Earth’s revolution around the sun.

15. Earth’s Seasons

16. When it is summer in North America, our half of Earth is tilted toward the sun. This tilt makes the days longer and warmer than during winter months. When it is summer in North America, our half of Earth is tilted toward the sun. This tilt makes the days longer and warmer than during winter months.

17. Earth’s Seasons During winter, our half of Earth is tilted away from the sun, making the days shorter and cooler. During winter, our half of Earth is tilted away from the sun, making the days shorter and cooler. When it is winter in the northern hemisphere (half) of Earth, then it is summer in the southern hemisphere. When it is winter in the northern hemisphere (half) of Earth, then it is summer in the southern hemisphere.

19. Earth’s Seasons

21. Which of these is a result of the spinning of Earth on its axis? A. The apparent motion of the sun in the sky A. The apparent motion of the sun in the sky B. The motion caused by Earth’s revolution B. The motion caused by Earth’s revolution C. The constellations C. The constellations D. The change from spring to summer D. The change from spring to summer

22. Which of these is a result of the spinning of Earth on its axis? A. The apparent motion of the sun in the sky A. The apparent motion of the sun in the sky

23. Why are different constellations visible in the night sky at different parts of the year? A. Earth’s wobble A. Earth’s wobble B. Earth’s rotation B. Earth’s rotation C. Earth’s revolution C. Earth’s revolution D. Earth’s tides D. Earth’s tides

24. Why are different constellations visible in the night sky at different parts of the year? C. Earth’s revolution C. Earth’s revolution

25. What causes the seasons on Earth? A. Earth’s revolution and the tilt of its axis A. Earth’s revolution and the tilt of its axis B. Earth’s rotation and the tilt of its axis B. Earth’s rotation and the tilt of its axis C. Earth’s rotation and wobble C. Earth’s rotation and wobble D. Earth’s tides and rotation on its axis D. Earth’s tides and rotation on its axis

26. What causes the seasons on Earth? A. Earth’s revolution and the tilt of its axis A. Earth’s revolution and the tilt of its axis