"The Secret of the "Immovable" Polaris" The Movement of the Earth PPT

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"The Secret of the "Immovable" Polaris" The Movement of the Earth PPT

Part One: Explanation of Polaris’ “immobility”

This photo was taken continuously over a long period of time at night against the Arctic sky. Those bright rings are the paths of the stars during this time. The bright spot near the center of the circle is Polaris.

People have also photographed the rotation of stars in Antarctica.

What do the two pictures have in common?

What kind of sports do the constellations in the picture do? Why is this so?

All have a center.

The stars rotate and form many rings centered around the center of the circle.

The center of the circle is not at the zenith, but at a certain height from the horizon.

Draw the stars and Polaris on paper, fix the Polaris with thumbtacks, and rotate the cardboard. What phenomena do you observe?

Polaris remains stationary and the other stars revolve around it.

Use another cardboard to represent the horizon and block the bottom part of the rotating cardboard. What phenomenon do you observe?

Some of the stars that are closer to Polaris will not sink below the horizon during their rotation, while other stars that are farther away from Polaris will sink below the horizon during their rotation.

PPT on the secret of Polaris’ immobility, part 2: Summary of the characteristics of the Earth’s rotation

Summarize the characteristics of the earth's rotation.

Does it rotate around the earth's axis? Yes

Is the earth's axis tilted? Yes

Does the tilt direction of the Earth's axis change? The tilt direction remains unchanged.

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For more information about the PPT courseware "The Movement of the Earth: The Secret of Polaris' Immobility", please click on the "The Movement of the Earth" ppt: The Secret of "Polaris' Immobility" ppt tag.

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Update Time: 2024-09-30

This template belongs to science courseware Fifth Grade Science Volume 2, Textbook Edition industry PPT template

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