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Rotation and Revolution

Rotation and Revolution. Rotation Spin or Turn on an Axis. Vertical Axis- Like the skater Horizontal Axis – like the log Rotational Axis – like the Earth. Earth’s Axis is tilted 23.5 degrees from vertical. What do you observe about the angle of the tilt? . They are all the same.

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Rotation and Revolution

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  1. Rotation and Revolution

  2. Rotation Spin or Turn on an Axis

  3. Vertical Axis- Like the skater Horizontal Axis – like the log Rotational Axis – like the Earth Earth’s Axis is tilted 23.5 degrees from vertical

  4. What do you observe about the angle of the tilt? They are all the same

  5. Earth's rotational axis points in the same direction relative to the stars, so that the North Pole points towards the star Polaris or North Star. This constant allows sailors to navigate at night.

  6. The Earth Continuously Rotates on its Axis causing Day and Night.

  7. The Earth • Rotates around once in 24 hours • The time required to rotate completely around once is called a day.

  8. The Earth Continuously Orbits the Sun or Revolves The time it takes for the Earth to go completely around the Sun is called a year.

  9. Like all planets in our solar system, the Earth is in an elliptical orbit around our Sun. In Earth's case, its orbit is nearly circular, so that the difference between Earth's farthest point from the Sun and its closest point is very small.

  10. It takes 365.25 rotations for the Earth to go around the Sun once.

  11. Each 4 years, one day is added to the month of February to make up for the 0.25 (1/4) rotation in each revolution around the sun. February 29 This is called Leap Year.

  12. The Earth moves in definite pattern around the Sun.

  13. Let’s Review

  14. What is the turning of an object around its axis called? AXIS A revolving B rotating C rolling D ballet dancing

  15. What is the science term for the turning of an object around its axis called? B rotating – Correct Rotating is the turning or spinning around an axis. A revolving – Incorrect Revolving is moving around another Object.

  16. What is the science term for the turning of an object around its axis called? C rolling – Incorrect Act of causing an object to turn or rotate D dancing –Incorrect Many dance step do not require the rotation of the dancer’s body.

  17. How long does it take the Earth to make one rotation? -Correct- It takes 1 day or 24 hours. A day B week C month D year -Incorrect – A week is 7 days. -Incorrect – It takes about a month for the moon to rotate. -Incorrect – It takes 365.25 rotations for a year.

  18. The following are constant except for: -Incorrect – The earth rotates continually causing day/night. A Earth’s Rotation B Earth’s Orbit C order of seasons D weather -Incorrect – The earth orbits in the same path yearly. - Incorrect – The season are caused by tilt and orbit of the earth. - Correct – Weather changes continually.

  19. What does the Earth revolve around? A moon B Milky Way Galaxy C Nothing D sun - Incorrect - The moon revolves around the Earth. -Incorrect - The Earth is part of the Solar System. -Incorrect- Observation has shown this incorrect – Correct – All planets and planetary systems in the Solar System revolve around the sun.

  20. During 2012, which of the following will remain constant in Texas? -Incorrect – Weather may change by the minute. A weather B same stars seen every night C tilt of Earth’s axis D temperature -Incorrect – Some stars are only seen during certain months. -Correct – The axis will be tilted at 23.5 degrees all year. -Incorrect- Temperature changes.

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