Rotation and Revolution What causes night and day? What causes the seasons to change?

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Rotation and Revolution

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Presentation transcript:

Rotation and Revolution What causes night and day? What causes the seasons to change?

Rotation is the spinning of an object on its axis.

Rotation What does Rotation mean? Rotation occurs when something is spinning around an axis. What are some examples of things that rotate?  Wheels, Dancers, Figure skaters, Tornadoes, toy tops, Hurricanes, a Merry-go-round, and Planets like Earth

What does Rotation mean? Rotation occurs when something is spinning around an axis.

What does Rotation mean? Rotation occurs when something is spinning around an axis.

What does Rotation mean? Rotation occurs when something is spinning around an axis.

Rotation How do we know that the Earth rotates? 1.Star trails- trails made with time exposure, circular paths that occur because the planet is moving and not stationary. 2.Winds curve because of the Earth’s rotation. 3.Ocean currents curve clockwise in the northern hemisphere, and counterclockwise in the southern hemisphere. 4.The movement of a pendulum. It does not actually move, it is the Earth moving that causes the pendulum to appear to change the direction of its swing.

Rotation How do we know that the Earth rotates? 1.Star trails- trails made with time exposure, circular paths that occur because the planet is moving and not stationary. 2.Winds curve because of the Earth’s rotation. 3.Ocean currents curve clockwise in the northern hemisphere, and counterclockwise in the southern hemisphere. 4.The movement of a pendulum. It does not actually move, it is the Earth moving that causes the pendulum to appear to change the direction of its swing.

Rotation

Night and Day What causes night and day? The rotation of the Earth The side of the Earth that is facing the sun has daylight, the side of the Earth away from the sun has night. It takes 24 hours for the Earth to complete one rotation. The Earth is tilted on it’s axis at a 23.5 degree angle. The Earth’s tilt is always in the direction of the North Star. What is another name for the North Star? Polaris This tilt is what causes our days to get longer in the summer and shorter in the winter. Because of the Earth’s rotation the sun appears to rise in the east and set in the west.

Revolution Revolution is the movement of one object in orbit around another object.

Revolution Revolution is the movement of one object in orbit around another object.

Revolution Revolution is the movement of one object in orbit around another object.

Revolution Revolution is the movement of one object in orbit around another object.

Seasons What three things cause the difference in the seasons? 1.The tilt 2.The tilt controls the angle of the sun’s rays 3.The tilt determines the length of the days

Seasons What three things cause the difference in the seasons? 1.The tilt 2.The tilt controls the angle of the sun’s rays 3.The tilt determines the length of the days There are two kinds of rays from the Sun: 1.Direct- occurs when Earth is tilted toward the Sun 2.Indirect-occurs when Earth is tilted away from the Sun

Seasons In the Summer, we get the direct rays from the sun and the days are longer. (But we are farther away from the Sun) In the Winter, we get indirect rays from the Sun and the days are shorter. (But we are closer to the Sun)

Summary What is the difference between rotation and revolution? Rotation occurs when an object spins around an axis. Revolution occurs when an object spins around another object. Give me an example of something that revolves, and something that rotates. What type of movement causes night and day? The Earth’s rotation What type of movement causes the change of seasons? The Earth’s revolution- the angle of the sun, and the length of the day. How do we know that the Earth Rotates? Star trails, ocean currents, wind currents

Fire Tornado

Mastery Question Which of the following correctly describes an object rotating? A. A person running around a race track B. An ice skater spinning only on their right foot C. A kid drawing a circle on a piece of paper D. A chef slicing a pie into eight separate pieces.