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How does Earth move?Chapter 9 Lesson 11. The sun is the center of our solar system. 2. Earth and other planets move around the sun.3. Earth spins, causing the sun and other objects, such as other stars, to appear to move across the sky. 4. Earth and other planets rotate around an imaginary line called the axis. 5. The northern end of the Earth’s axis is called the North Pole.6. The southern end of the Earth’s axis is called the South Pole.7. One whole spin of an object is called a rotation. 8. One full rotation is called a day. 9. Earth rotates around its axis from west to east. 10. As the Earth spins, the sun, moon, stars and planets only seem to rise in the east and set in the west. 11. Earth also moves in an orbit.-An orbit is the path an object takes as it revolves around a star, planet or moon.-Earth’s orbit is elliptical.12. One full orbit of an object around another object is called a revolution. -Earth’s revolution around the sun lasts for just a few hours longer than 365 days.13. The moon’s revolution around the Earth takes 27.3 days or about a month.14. Gravity keeps Earth in its orbit around the sun. -The sun is so massive; its gravity pulls all the planets towards it.-This pull keeps the planets from moving in straight lines into space.15. Earth’s tilt affects how much sunlight parts of Earth receive.- The amount of sunlight an area receives affects its climate and seasons. - Seasons change as Earth’s axis tilts either toward or away from the sun at different times during its revolution. - For example: When the North Pole is tilted away from the sun, sunlight is less so it is winter. But, the South Pole is tilted toward the sun, sunlight is more so it is summer. 15. The number of daylight hours change as the seasons change.-There are more daylight hours on the 1st day of summer than any other day of the year.-There are less daylight hours on the 1st day of winter than are any other day of the year.-Twice a year the hours of day and night are equal, because the Earth’s axis points neither toward nor away from the sun. ................
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