"The Secret of the "Immovable" Polaris" Earth's Movement PPT Download

Description

"The Secret of the "Immovable" Polaris" Earth's Movement PPT Download

Part One Content: Collaborative Exploration

Look carefully at these two pictures, analyze and explain:

1. What do the two pictures have in common?

2. What movement are the constellations in the picture doing? Why is this so?

3. The North Star near the center of the circle seems to be motionless. How to explain it?

Common points:

① Both pictures have a circle center;

②The stars rotate and form many rings with the center of the circle as the center;

③The center of the circle is not at the zenith, but is at a certain height from the horizon.

How to explain that Polaris is "not moving"

It will be observed:

The other stars rotate counterclockwise around Polaris. Some of the stars that are closer to the North Star will not sink below the horizon during their rotation, while other stars that are farther away from the North Star will sink below the horizon during their rotation. This is what people often call the rising in the east and setting in the west.

PPT about the immovable secret of Polaris, part 2: expansion and extension

In order to avoid date confusion, the International Meridian Conference in 1884 established an international date line. This change line is an imaginary line that coincides with the 180-degree longitude and serves as the dividing line between "today" and "yesterday" on the earth, so it is called the "International Date Line."

Polaris is a star with a relatively stable brightness and position that can be seen in the northern part of the sky. It is located in the constellation Ursa Minor and is approximately 434 light-years away from Earth. Its position remains almost unchanged when viewed from Earth, and people on Earth have relied on its starlight to navigate for thousands of years.

The secret of Polaris’ immobility PPT, part 3: Classroom exercises

1. Fill in the blanks

1. The earth rotates around an imaginary axis, called ( ).

2. When the earth's axis rotates, the earth's axis is always ( ).

3. Polaris is visible in the northern part of the sky and its brightness and position are relatively stable ( ).

4. The direction of the Earth's axis ( ) remains unchanged.

2. Judgment questions

1. The North Star always remains "stationary", and the other stars are rotating around the North Star. ( )

2. The position of the Big Dipper in the sky gradually moves westward with seasonal changes. ( )

3. The earth's rotation has an axis. The axis is relatively stationary, and the axis can also be tilted. ( )

The secret of Polaris’ immutability PPT, Part 4: Homework

Let’s sort out what we learned and summarize the characteristics of the earth’s rotation.

Keywords: Free download of Chinese PPT courseware for the second volume of the fifth grade of the textbook version, PPT download of the secret of the immutability of the North Star, PPT download of the movement of the earth, .PPT format;

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

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

"The Secret of Polaris' Immobility" The Earth's Movement PPT Part One: Explanation of Polaris' Immobility This photo was taken by people taking continuous photos of the Arctic sky over a long period of time at night. Those bright rings are the stars' luck during this period...

"The Secret of the "Movement" of Polaris" Earth's Movement PPT Courseware 3:

"The Secret of the Motionless Polar Star" The Movement of the Earth PPT Courseware 3 The Big Dipper The Big Dipper is the main body of the Ursa Major constellation. Its shape is like a spoon, and it is also called spoon star among Chinese people. Extend the line connecting the two stars (pole stars) on the side of the mouth of the bucket about 5 times to the outside of the mouth of the bucket, and you can find the north...

"The Secret of Polaris' Immobility" Earth's Movement PPT Courseware 2:

"The Secret of the Motionless Polar Star" The Movement of the Earth PPT Courseware 2 Introduction to Polar Star Polar Star is the symbol of the northern sky. Ancient astronomers respected Polaris very much and believed that it was fixed and that all the stars revolved around it. Polaris belongs to the constellation Ursa Minor and is about 400 light from the Earth..

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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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